Data Sheet

Data Sheet
Rev. 1.40 / June 2014
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Automotive ASICs and Industrial ASSPs
LED Lighting ICs
Multi-Functional and Robust
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Brief Description
Benefits
The ZLED7x20 continuous-mode inductive stepdown converter family is part of our line of LEDcontrol ICs. It is designed for applications requiring
high brightness and high current. It can efficiently
drive a single LED or multiple series-connected
LEDs from a voltage input higher than the LED forward voltage: Vin = 6 to 40 VDC. It provides an
adjustable output current ≤1.2A, which is set via an
external resistor and controlled by the ZLED7x20’s
integrated high-side output current-sensing circuit
and high speed internal 40V power switch. An
external control signal, which can be a DC voltage,
PWM, or microcontroller-generated waveform, on
the ADJ pin can also be used to linearly adjust a
continuous output current or to control a gated output current.
 High efficiency: up to 98%
 Single pin on/off and brightness control using
DC voltage or PWM
 Very few external components needed for
operation
 Footprint compatible with our ZLED7000
depending on the application.
Available Support
 Evaluation Kit
Physical Characteristics
 Operating junction temperature: -40°C to 125°C
 Switching frequency: up to 1MHz
The output can be turned off by applying a voltage
lower than 0.2V to the ADJ pin, which puts the
ZLED7x20 in a low-current standby state.
ZLED7x20 Family Selection Matrix
The ZLED7x20 enables diverse industrial and
consumer lighting applications requiring high
driving currents, wide operating voltage range,
high efficiency, and variable brightness control. It
offers over-temperature and LED open-circuit protection. The ZLED7x20 can also minimize bill-ofmaterial costs because very few external components are required for most applications. Only a
resistor, a diode, an inductor, and three capacitors
are needed for a typical basic application.
Product
Max. Current Output
Package
ZLED7020
1.2A
SOT89-5
ZLED7320
1.0A
DFN-5
ZLED7520
0.75A
DFN-5
ZLED7720
0.35A
DFN-5
ZLED7x20 Typical Application Circuit
Features
Rs
Vs = 6 to 40 VDC
 Up to 1.2A output current
D1
 Internal 40V power switch
 Wide DC input voltage range 6 to 40 VDC
 Output current accuracy: 3% (typical)
Vin
 Dimming ratio: 1200:1
 LED open-circuit protection
 Thermal shutdown protection
(C1)
C2
0.1µF
LX
GND
LED
String
L1
ZLED7x20
ADJ
(C3)
I SENSE
33µH to
220µH
For more information, contact ZMDI via [email protected]
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40 — June 11, 2014. All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated,
stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
ZLED7x20 Block Diagram
6 to 40 VDC
Rs
VS
D1
4 ISENSE
(C1)
C2
VCC
0.1µF
5
VIN
(C3)
n LED
VDDA
Power
Supply,
Oscillator,
and UnderVoltage
Detection
(UV)
VDDD
1
ISENSE
LX
VIN
Power
MOS
UV
ISENSE
And
Driver
POR
VREF
SD
L1
33µH to
220µH
DR
SD
500kΩ
3
Shutdown
ADJ
ISENSE
ZLED7X20
POR
Trim
LX
GND
2
Typical Applications
 Illuminated LED signs and other displays
 Interior/exterior LED lighting
 LED street and traffic lighting (low voltage)
 MR16 LED spot lights
 Architecture/building LED lighting
 Retrofit LED lighting fixtures
 LED backlighting
 General purpose industrial and consumer LED applications
Ordering Information
Product Code
Description
ZLED7020-ZI1R
ZLED7020 – High Current (1200mA) 40V LED Driver with Internal Switch
SOT89-5 (Tape & Reel)
ZLED7320-ZI1R
ZLED7320 – High Current (1000mA) 40V LED Driver with Internal Switch
DFN-5 (Tape & Reel)
ZLED7520-ZI1R
ZLED7520 – High Current (750mA) 40V LED Driver with Internal Switch
DFN-5 (Tape & Reel)
ZLED7720-ZI1R
ZLED7720 – High Current (350mA) 40V LED Driver with Internal Switch
DFN-5 (Tape & Reel)
ZLED7020KIT-D1
ZLED7020-D1 Demo Board, 1 ZLED-PCB8 and 5 ZLED7020 ICs
Kit
ZLED-PCB8
Test PCB with a 5W white high brightness (HB) LED, cascadable to a multiple LED string
Printed Circuit Board (PCB)
Sales and Further Information
Package
www.zmdi.com
[email protected]
Zentrum Mikroelektronik
Dresden AG
Global Headquarters
Grenzstrasse 28
01109 Dresden, Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
Central Office:
Phone +49.351.8822.306
Fax
+49.351.8822.337
USA Phone 1.855.275.9634
Phone +1.408.883.6310
Fax
+1.408.883.6358
European Technical Support
Phone +49.351.8822.7.772
Fax
+49.351.8822.87.772
DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Zentrum Mikroelektronik Dresden AG (ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The
information furnished hereby is believed to be true and accurate. However, under no circumstances shall ZMD AG be liable to any customer,
licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or
in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any
customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for
any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty,
tort (including negligence), strict liability, or otherwise.
European Sales (Stuttgart)
Phone +49.711.674517.55
Fax
+49.711.674517.87955
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
Zentrum Mikroelektronik
Dresden AG, Korea Office
U-space 1 Building
11th Floor, Unit JA-1102
670 Sampyeong-dong
Bundang-gu, Seongnam-si
Gyeonggi-do, 463-400
Korea
Phone +82.31.950.7679
Fax
+82.504.841.3026
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40 — June 11, 2014.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Contents
1
2
3
IC Characteristics .......................................................................................................................................................... 6
1.1
Absolute Maximum Ratings ................................................................................................................................... 6
1.2
Operating Conditions ............................................................................................................................................. 6
1.3
Electrical Parameters ............................................................................................................................................. 7
1.4
Typical Operation Graphs ...................................................................................................................................... 8
Circuit Description ....................................................................................................................................................... 13
2.1
ZLED7x20 Overview ............................................................................................................................................ 13
2.2
Control of Output Current via External Sense Resistor Rs .................................................................................. 13
2.3
Control of Output Current via an External DC Control Voltage on the ADJ Pin ................................................... 13
2.4
Additional Requirements if the VIN Input Voltage has a High Slew Rate .............................................................. 14
2.5
Control of Output Current via a PWM Signal on the ADJ Pin............................................................................... 14
2.6
Control of Output Current via a Microcontroller Signal on the ADJ Pin ................................................................ 14
2.7
Shutdown Mode ................................................................................................................................................... 14
2.8
ZLED7x20 Protection Features ............................................................................................................................ 15
2.8.1
Thermal Shut-down Protection ..................................................................................................................... 15
2.8.2
LED Open Load Protection ........................................................................................................................... 15
Application Circuit Design ........................................................................................................................................... 16
3.1
Applications ......................................................................................................................................................... 16
3.2
Thermal Considerations for Application Design ................................................................................................... 18
3.2.1
Temperature Effects of Load, Layout, and Component Selection ................................................................ 18
3.2.2
Temperature Effects of Low Supply Voltage VIN ........................................................................................... 18
3.3
External Component Selection ............................................................................................................................ 18
3.3.1
Sense Resistor Rs ........................................................................................................................................ 18
3.3.2
Inductor L1.................................................................................................................................................... 19
3.3.3
Bypass Capacitor C1 .................................................................................................................................... 20
3.3.4
De-bouncing Capacitor C2 ........................................................................................................................... 21
3.3.5
Capacitor C3 for Reducing Output Ripple..................................................................................................... 22
3.3.6
Diode D1....................................................................................................................................................... 22
3.4
Application Circuit Layout Requirements ............................................................................................................. 22
4
ESD Protection ............................................................................................................................................................ 23
5
Pin Configuration and Package ................................................................................................................................... 23
5.1
SOT89-5 Package Pin-out and Dimensions for the ZLED7020 ........................................................................... 23
5.2
DFN-5 Package Pin-out and Dimensions for the ZLED7320, ZLED7520 and ZLED7720 ................................... 25
6
Ordering Information ................................................................................................................................................... 27
7
Related Documents ..................................................................................................................................................... 27
8
Glossary ...................................................................................................................................................................... 27
9
Document Revision History ......................................................................................................................................... 28
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
4 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
List of Figures
Figure 1.1 ZLED7x20 Supply Operating Current vs. Input Supply Voltage (VIN = 6 to 40 V) ................................................... 8
Figure 1.2 ZLED7x20 Supply Quiescent Shutdown Current vs. Input Supply Voltage (VIN = 6 to 40 V) .................................. 8
Figure 1.3 Efficiency (%) vs. Input Supply Voltage (VIN = 6 to 40 V) Per Number of LEDs (Rs=0.10Ω, L1=47μH).................. 9
Figure 1.4 Efficiency vs. Input Supply Voltage (VIN = 6 to 40 V) Per Number of LEDs (Rs=0.15Ω, L1=47μH) ........................ 9
‡
Figure 1.5 Efficiency vs. Input Supply Voltage (VIN = 6 to 40 V) Per Number of LEDs (Rs=0.30Ω, L1=47μH) ..................... 10
Figure 1.6 Output Current Variation vs. Input Supply Voltage (VIN = 6 to 40 V) Per Number of LEDs (Rs = 0.15Ω, L1 = 47μH)
............................................................................................................................................................................. 10
Figure 1.7 Sense Voltage vs. Operating Temperature (Rs=0.10Ω, L1=47μH, VIN = 40 V) .................................................... 11
Figure 1.8 Dimming Rate with 100Hz Square Wave Control Signal (PWM) at ADJ Pin (current rise time=7.85μs) ............. 11
Figure 1.9 LED Open-Circuit Protection (Rs=0.30Ω, L1=47μH, VIN = 24 V) .......................................................................... 12
Figure 3.1 Basic ZLED7x20 Application Circuit with Output Current Determined only by Rs ................................................ 16
Figure 3.2 Basic ZLED7x20 Application Circuit with Output Current Controlled by External DC Voltage .............................. 16
Figure 3.3 Basic ZLED7x20 Application Circuit with Output Current Set by External Square Wave Voltage (PWM) ............ 17
Figure 3.4 Basic ZLED7x20 Application Circuit with Output Current Controlled by External Microcontroller Signal .............. 17
Figure 5.1 ZLED7020 Pin Configuration – SOT89-5 Package............................................................................................... 23
Figure 5.2 SOT89-5 Package Dimensions for the ZLED7020 ............................................................................................... 24
Figure 5.3 ZLED7320, ZLED7520 & ZLED7720 Pin Configuration — DFN-5 Package......................................................... 25
Figure 5.4 DFN-5 (DFN4*4-05L) Package Dimensions for the ZLED7320, ZLED7520 & ZLED7720 ................................... 26
List of Tables
Table 3.1
Recommended Values for Sense Resistor Rs (ADJ pin floating at nominal voltage V REF=1.2V) .......................... 18
Table 5.1
ZLED7020 Pin Descriptions—SOT89-5 Package................................................................................................. 23
Table 5.2
ZLED7320, ZLED7520 & ZLED7720 Pin Descriptions — DFN-5 Package .......................................................... 25
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
5 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
1
IC Characteristics
Note: Exceeding the maximum ratings given in this section could cause operation failure and/or cause permanent
damage to the ZLED7x20. Exposure to these conditions for extended periods may affect device reliability.
1.1
Absolute Maximum Ratings
No.
PARAMETER
1.1.1
Input voltage (also see
specification 1.2.2)
1.1.2
ISENSE pin voltage
SYMBOL
CONDITIONS
MAX
UNIT
-0.3
50
V
VIN≥5V
VIN-5V
VIN+0.3V
V
VIN<5V
-0.3V
VIN+0.3V
V
VIN
VISENSE
MIN
TYP
1.1.3
LX pin output voltage
VLX
-0.3
50
V
1.1.4
ADJ pin input voltage
VADJ
-0.3
6
V
1.1.5
LX pin switch output current
ILX
1.5
A
1.1.6
Power dissipation
PTOT
0.5
W
1.1.7
ESD performance
1.1.8
Junction temperature
1.1.9
Junction to ambient thermal
resistance
1.1.10
1.2
Storage temperature
Human Body Model
±3.5
kV
TJ
RθJA
150
°C
SOT89-5 package
100
K/W
DFN5 package
130
K/W
150
°C
MAX
UNIT
TS
-55
Operating Conditions
No.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
1.2.1
Operating junction
temperature
TJ
-40
125
°C
1.2.2
Input voltage (also see
specification 1.1.1)
VIN
6
40
V
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
6 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
1.3
Electrical Parameters
Test conditions for the following specifications are Tamb = 25°C typical and VIN = 12V unless otherwise noted.
Production testing of the chip is performed at 25°C unless otherwise stated. Functional operation of the chip and
specified parameters at other temperatures are guaranteed by design, characterization, and process control.
No.
1.3.1
PARAMETER
Quiescent supply current
SYMBOL
CONDITIONS
IINQoff
Output off—ADJ pin
grounded
IINQon
Output switching—ADJ pin
floating
1.3.2
Mean current sense
threshold voltage
1.3.3
Sense threshold hysteresis
1.3.4
ISENSE pin input current
ISENSE
VSENSE = VIN -0.1V
1.3.5
Internal reference voltage
measured at ADJ pin
VREF
ADJ pin floating
1.3.6
Resistance between VREF
and ADJ pin
RADJ
1.3.7
External DC brightness
control voltage on ADJ pin
VADJ
1.3.8
DC on-off control voltage on
ADJ pin for switching
ZLED7x20 from active state
to quiescent state
VADJoff
DC off-on control voltage on
ADJ pin for switching
ZLED7x20 from quiescent
state to active state
VADJon
1.3.9
1.3.10
LX switch continuous
current
VSENSE
MIN
TYP
MAX
UNIT
90
120
160
μA
450
600
μA
100
103
mV
97
VSENSEHYS
±15
%
8
μA
1.2
V
500
KΩ
0.3
1.2
V
VADJ falling
0.15
0.2
0.25
V
0.2
0.25
0.3
V
VADJ rising
ILXmean_0
ZLED7020
1.2
A
ILXmean_3
ZLED7320
1.0
A
ILXmean_5
ZLED7520
0.75
A
ILXmean_7
ZLED7720
0.35
A
1
μA
0.4
Ω
1.3.11
LX switch leakage current
1.3.12
LX switch on resistance
RLX
1.3.13
Minimum switch on time
tONmin
LX switch on
200
ns
1.3.14
Minimum switch off time
tOFFmin
LX switch off
200
ns
1.3.15
Dimming rate
Data Sheet
June 11, 2014
ILX(leak)
DDIM
0.27
1 LED, f =100Hz, Vin=15V,
L1 = 27μH
1200:1
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
7 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
No.
PARAMETER
SYMBOL
1.3.16
Recommended operating
frequency maximum
fLXmax
1.3.17
Recommended output
switch duty cycle range at
fLXmax
DLX
1.3.18
Propagation delay of
internal comparator
tPD
1.3.19
Thermal shutdown
temperature
TSD
1.3.20
Thermal shutdown
hysteresis
TSD-HYS
1.4
CONDITIONS
MIN
TYP
0.3
MAX
UNIT
1
MHz
0.9
50
ns
150
°C
20
K
Typical Operation Graphs
The curves are valid for the typical application circuit and T amb = 25°C unless otherwise noted.
ZLED7x20 Supply Operating Current vs. Input Supply Voltage (VIN = 6 to 40 V)
Icc(uA)
Figure 1.1
600
500
400
300
200
100
0
5
10
15
20
25
30
35
40
Vin(V)
ZLED7x20 Supply Quiescent Shutdown Current vs. Input Supply Voltage (VIN = 6 to 40 V)
Icc(uA)
Figure 1.2
250
200
150
100
50
0
5
10
15
20
25
30
35
40
Vin(V)
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
8 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
†
Efficiency (%) vs. Input Supply Voltage (VIN = 6 to 40 V) Per Number of LEDs (Rs=0.10Ω, L1=47μH)
Effiency(%)
Figure 1.3
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
Rs=0.10Ω
1LED
3LED
7LED
10LED
5
10
15
20
25
30
35
40
Vin(V)
‡
Efficiency vs. Input Supply Voltage (VIN = 6 to 40 V) Per Number of LEDs (Rs=0.15Ω, L1=47μH)
Effiency(%)
Figure 1.4
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
Rs=0.15Ω
1LED
3LED
7LED
10LED
5
10
15
20
25
30
35
40
Vin(V)
†
‡
Minimum Vin depends on number of LEDs.
Minimum Vin depends on number of LEDs.
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
9 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
‡
Efficiency vs. Input Supply Voltage (VIN = 6 to 40 V) Per Number of LEDs (Rs=0.30Ω, L1=47μH)
Effiency(%)
Figure 1.5
1
Rs=0.30Ω
0.95
1LED
3LED
0.9
0.85
7LED
10LED
0.8
0.75
0.7
0.65
0.6
5
10
15
20
25
30
35
40
Vin(V)
Figure 1.6
§
Output Current Variation vs. Input Supply Voltage (VIN = 6 to 40 V) Per Number of LEDs
(Rs = 0.15Ω, L1 = 47μH)
0.7
0.69
Rs=0.15Ω
Iout(A)
0.68
0.67
1LED
3LED
7LED
10LED
0.66
0.65
0.64
0.63
0.62
0.61
0.6
5
10
15
20
25
30
35
40
Vin(V)
§ Minimum Vin depends on number of LEDs.
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
10 of 28
ZLED7x20 Family
40VDC
Sense Voltage vs. Operating Temperature (Rs=0.10Ω, L1=47μH, VIN = 40 V)
VSENSE (mV)
Figure 1.7
Vsense(mV)
High Current 40V LED Driver with Internal Switch
99.4
99.2
99.0
98.8
98.6
98.4
98.2
98.0
97.8
-40 -30 -20 -10 0
10
20
30
40
50
60
70
80
90
100 110
Temperature (°C)
Figure 1.8
Dimming Rate with 100Hz Square Wave Control Signal (PWM) at ADJ Pin (current rise time=7.85μs)
Timebase -3.00 ms
1.00ms/div
500kS
50 MS/s
Data Sheet
June 11, 2014
温度(℃)
Trigger
Stop
Edge
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
C1 HFR
-50mV
Positive
11 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Figure 1.9
LED Open-Circuit Protection (Rs=0.30Ω, L1=47μH, VIN = 24 V)
Timebase
-5.2 s
Roll
5.00s/div
500kS
10 kS/s
Data Sheet
June 11, 2014
Trigger
C1 DC
Stop
15.0V
Edge Negative
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
12 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
2
Circuit Description
2.1
ZLED7x20 Overview
The ZLED7x20 is a continuous-mode inductive step-down converter LED driver for driving single or multiple
series-connected LEDs from a voltage input higher than the LED voltage (Vin = 6 to 40 VDC; see section 3.2.2 for
important details). The ZLED7x20 provides an adjustable output current (1.2A maximum for ZLED7020; 1.0A
maximum for ZLED7320; 0.75A maximum for ZLED7520; 0.35A maximum for ZLED7720), which is nominally set
via an external sense resistor Rs and controlled by the ZLED7x20’s integrated high-side output current-sensing
circuit and output switch. An external control signal (e.g., DC voltage, PWM waveform, or microprocessor signal)
on the ADJ pin can be used to linearly adjust the output for continuous, variable, or gated-output current. See
page 3 for a block diagram of the ZLED7x20.
The output can be turned off by applying a voltage ≤0.2V (typical) to the ADJ pin, which puts the ZLED7x20 in a
low-current standby state. See section 2.7 for a description of this shutdown mode.
Only a resistor, a diode, an inductor, and three capacitors are needed for a typical basic application. Refer to the
application circuits in section 3 for the location of the components referenced in the following sections.
2.2
Control of Output Current via External Sense Resistor Rs
External sense resistor Rs, which is connected between the VIN and ISENSE pins as shown in Figure 3.1, sets
IOUTnom, the nominal average output current. Equation (1) can be used to calculate the nominal output current,
which is the LX switch output current ILX if the ADJ pin is floating (VADJ = VREF =1.2V). See section 3.3.1 for
recommended values for Rs in a typical basic application and section 3.4 for layout guidelines for Rs. Note that
the peak IOUTnom including ripple (see section 3.3.5) must not exceed the maximum current specifications (1.3.10).
IOUTnom 
2.3
0.1V
Rs
(1)
Control of Output Current via an External DC Control Voltage on the ADJ Pin
An external DC voltage (VADJ) input on the ADJ pin can control brightness by setting the output current to a value
below the nominal average current IOUTnom determined by RS. With this method, the output current can be adjusted
from 25% to 100% of IOUTnom. The DC voltage source must be capable of driving the ADJ pin’s input impedance
RADJ (500kΩ ± approximately 25%; internal pull-up resistor to VREF). See Figure 3.2 for a typical application circuit.
The nominal average output current IOUTdc resulting from an external DC control voltage VADJ can be calculated via
equation (2) where 0.3V≤ VADJ ≤1.2V:
IOUTdc 
Data Sheet
June 11, 2014
0.083  VADJ
RS
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
(2)
13 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Brightness is 100% if VADJ = VREF, the internal reference voltage, which can be measured on the ADJ pin when it is
floating (1.2V, typical). If VADJ ≥ 1.2V, the current is automatically clamped at 100% brightness.
Note: Absolute maximum VADJ= 6V.
2.4
Additional Requirements if the VIN Input Voltage has a High Slew Rate
The analog dimming input ADJ can be used for implementing a soft-start function of the LEDs by connecting a
capacitor to ground. The soft-start time constant is determined by the product of the internal pull-up resistor
(500k typical) and the external capacitor.
Important: If the supply voltage VIN might have a high slew rate (> 1V/µs) when powered on, a resistor that is
 1k must be placed in series with the capacitor to guarantee correct power-on timing for the ZLED7x20 and
proper loading of the current sense trimming data into the appropriate register. This resistor is not necessary if the
capacitor is  470pF.
If the ADJ pin is controlled from an external voltage source or PWM signal, a series resistor is strongly
recommended for noise immunity reasons and to avoid bulk current injection.
2.5
Control of Output Current via a PWM Signal on the ADJ Pin
An external pulse width modulation (PWM) control signal input on the ADJ pin can be used for brightness or gated
on/off control of the output current by driving the output current to a value below the nominal average current
determined by RS. See Figure 3.3 for a typical application circuit. The PWM or gated on/off control signal can be
within the range of 0 to 5 V. The logic high level must be higher than 1.2V and the logic low level must be below
0.2V. It must be capable of driving the ADJ pin’s input impedance RADJ (approximately 500kΩ; internal pull-up
resistor to VREF).
2.6
Control of Output Current via a Microcontroller Signal on the ADJ Pin
An external control signal from the open drain output of a microcontroller can provide on/off or PWM brightness
control by driving the ADJ pin. See Figure 3.4 for a typical application circuit. Diode D2 and resistor R1 shown in
Figure 3.4 suppress any negative high-amplitude spikes on the ADJ input due to the drain-source capacitance of
the FET in the microcontroller’s output. Negative spikes on the ADJ input could cause output current errors or
unintended ZLED7x20 operation. The signal input to the ADJ pin must be capable of driving the ADJ pin’s input
impedance RADJ (approximately 500kΩ; internal pull-up resistor to VREF).
2.7
Shutdown Mode
If the ADJ pin voltage VADJ is ≤ VADJoff (0.2V ± 0.05V), the supply current and output on the LX pin are quiescent at
a low standby level (IINQoff = 120μA nominal). Raising the ADJ pin voltage so that VADJ ≥ VADJion (0.25V ± 0.05V)
will switch the output back to full operational mode.
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
14 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
2.8
2.8.1
ZLED7x20 Protection Features
Thermal Shut-down Protection
The ZLED7x20 automatically protects itself from damage due to over-temperature conditions. If the ZLED7x20’s
temperature exceeds the thermal shutdown threshold (T SD = 150°C, typical), the ZLED7x20 will shut down. To
avoid erratic ZLED7x20 operation, a 20K hysteresis (TSD-HYS) is applied that prevents it from returning to operation
until its temperature falls below the hysteresis threshold (T SD - TSD-HYS). Also refer to section 3.2 for additional
thermal considerations.
2.8.2
LED Open Load Protection
As a step-down converter, the ZLED7x20 has inherent open-load circuit protection. Since the L1 inductor is
connected in series with the LED string, the current flow is interrupted if the load is open and the LX output of the
ZLED7x20 will not be damaged. This provides an advantage over other products such as boost converters, for
which the internal switch can be damaged by back EMF forcing the drain above its breakdown voltage.
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
15 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
3
Application Circuit Design
3.1
Applications
The ZLED7x20 is designed for applications requiring features such as high-speed switching, variable brightness
control, operation with voltages up to 40V, high efficiency, or protection from over-temperature, or open LED
circuit conditions.
Typical applications include MR16/MR11 LED spotlights, LED street lights, parabolic aluminized reflector (PAR)
LED lights, and other general purpose industrial and consumer LED applications.
Figure 3.1, Figure 3.2, Figure 3.3, and Figure 3.4 demonstrate basic application circuits for the four options for
controlling output current described in section 2.
Figure 3.1
Basic ZLED7x20 Application Circuit with Output Current Determined only by Rs
Rs
Vs = 6 to 40 VDC
D1
Vin
C1
C2
0.1µF
LED
String
L1
ZLED7X20
LX
ADJ
Figure 3.2
C3
I SENSE
GND
Basic ZLED7x20 Application Circuit with Output Current Controlled by External DC Voltage
Rs
Vs = 6 to 40 VDC
D1
C1
C2
0.1µF
Vin
(0.3V to 1.2V)
June 11, 2014
LX
+
_
Data Sheet
LED
String
L1
ZLED7X20
ADJ
DC
C3
I SENSE
GND
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
16 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Figure 3.3
Basic ZLED7x20 Application Circuit with Output Current Set by External Square Wave Voltage (PWM)
Rs
Vs = 6 to 40 VDC
D1
C1
C2
0.1µF
Vin
PWM (0V to ~5V)
C3
I SENSE
LED
String
L1
ZLED7X20
ADJ
LX
GND
Figure 3.4
Basic ZLED7x20 Application Circuit with Output Current Controlled by External Microcontroller Signal
Rs
Vs = 6 to 40 VDC
D1
C1
C2
0.1µF
Vin
R1
10kΩ
Micro-
ADJ
Data Sheet
June 11, 2014
D2
LED
String
L1
ZLED7X20
LX
processor
GND
C3
I SENSE
GND
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
17 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
3.2
Thermal Considerations for Application Design
3.2.1
Temperature Effects of Load, Layout, and Component Selection
Do not exceed the package power dissipation limits by driving high load currents or by operating the chip at high
ambient temperatures. Power dissipation also increases if the efficiency of the circuit is low as could result from
selecting the wrong coil or from excessive parasitic output capacitance on the switch output. See the layout
guidelines in section 3.4.
3.2.2
Temperature Effects of Low Supply Voltage VIN
Until the supply input voltage on the VIN pin has risen above the internally-set startup threshold, the ZLED7x20’s
internal regulator disables the drive to the internal power MOSFET output switch. Above this threshold, the
MOSFET on-resistance is low enough for the chip to start to operate; however, if the supply voltage remains
below the specified minimum (6V), the duty cycle of the output switch will be high and the ZLED7x20 power
dissipation will be at a maximum. Avoid operating the ZLED7x20 under such conditions to reduce the risk of
damage due to exceeding the maximum die temperature. When driving multiple LEDs, their combined forward
voltage drop is typically high enough to prevent the chip from switching when VIN is below 6V, so there is less risk
of thermal damage.
3.3
External Component Selection
Note: Also see section 3.4 for layout guidelines for the following external components.
3.3.1
Sense Resistor Rs
Table 3.1 gives values for Rs under normal operating conditions in the typical application shown in Figure 3.1.
These values assume that the ADJ pin is floating and at the nominal voltage of V REF=1.2V.
Note: Under the conditions given in Table 3.1, in order to maintain the switch current below the maximum value
specified in section 1, 0.082Ω is the minimum value for Rs for the ZLED7020, 0.1Ω for the ZLED7320, 0.13Ω for
the ZLED7520 and 0.27Ω for the ZLED7720. It is possible to use different values of Rs if the ADJ pin is driven
from an external voltage.
To ensure stable output current, use a 1% accuracy resistor with adequate power tolerance and a good
temperature characteristic for Rs.
Table 3.1
Recommended Values for Sense Resistor Rs (ADJ pin floating at nominal voltage VREF=1.2V)
Nominal Average Output Current (mA)
Value for RS (Ω)
1200 (maximum for ZLED7020)
0.082
1000 (maximum for ZLED7320)
0.1
750 (maximum for ZLED7520)
0.13
667
0.15
350 (maximum for ZLED7720)
0.27
333
0.3
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
18 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
3.3.2
Inductor L1
The recommended range for the L1 inductor is 33μH to 220μH. Select the inductor value for L1 as needed to
ensure that switch on/off times are optimized across the load current and supply voltage ranges. If the application
requires a high supply voltage and low output current, inductance values at the high end of this range are recommended to minimize errors due to switching delays, which can reduce efficiency and increase ripple on the output.
Also see section 3.4 for layout considerations for L1. Equations (3) and (4) can be used to calculate tON and tOFF.
On Time for LX Switch (tONmin>200ns):
t ON 
VIN  VLED
L * I
 I AVG * (R S  rL  R LX )
(3)
Off Time for LX Switch (tOFFmin>200ns):
t OFF 
VLED
L * I
 VD  I AVG * (R S  rL )
(4)
Where:
Symbol
Description
L
L1 coil inductance in H
ΔI
L1 coil peak-peak ripple current in A (internally set to 0.3  IAVG)
VIN
Supply voltage in V
VLED
Total forward voltage in V for LED string
IAVG
Nominal average LED current in A
Rs
External current sense resistor in Ω
rL
L1 coil resistance in Ω
RLX
LX switch resistance in Ω
VD
D1 diode forward voltage at the required load current in V
The inductance value has an equivalent effect on tON and tOFF and therefore affects the switching frequency. For
the same reason, the inductance has no influence on the duty cycle, for which the relationship of the summed
LED forward voltages n * VF to the input voltage VIN is a reasonable approximation. Because the input voltage is a
factor in the on time, variations in the input voltage affect the switching frequency and duty cycle.
To achieve optimum performance, duty cycles close to 0.5 at the nominal average supply voltage are preferable
for improving the temperature stability of the output current.
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
19 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Equations (5), (6), (7), and (8) provide an example of calculating tON, tOFF, operating frequency fLX, and duty cycle
DLX when using a 220μH inductor for L1 and VIN=12V, Rs = 0.30Ω, rL=0.26Ω, VLED=3.4V, IAVG =333mA, VD=0.36V,
and RLX=0.27Ω.
Example:
t ON 
220H * 0.3 * 0.333A
 2.64s
12V  3.4 V  0.333A * 0.3  0.26  0.27
220H * 0.3 * 0.333A
 5.56s
3.4 V  0.36V  0.333A * 0.30  0.26
t OFF 
fLX 
t ON
DLX 
1
1

 121.8kHz
 t OFF
2.64s  5.56s
(5)
(6)
(7)
t ON
VLED 3.4 V
2.64s



 0.3
VIN
12V
t ON  t OFF
2.64s  5.56s
(8)
For the L1 inductor, use a coil with a continuous current rating higher than the required mean output current and a
saturation current that exceeds the peak output current by 30% to 50% for robustness against transient conditions; e.g., during start-up.
3.3.3
Bypass Capacitor C1
The bypass capacitor C1 has two functions: maintaining operating voltage and bypassing the current ripple of the
switching converter. In general low ESR capacitors must be used.
If the circuit is supplied by rectified line voltage, C1 must provide enough charge to maintain the ZLED7x20’s
minimum operating voltage as well as the forward voltage of the LED string to keep the application working even
if the rectified supply voltage periodically drops below these values. A rough estimate for the minimum capacity
needed can be calculated with equation (9).
C1MIN 
IAVG * t D
I * DLX
 F
VMAX
VMAX * fLX
(9)
Where:
Symbol
Description
IAVG
Average nominal LED string current assuming that the contribution of the IC supply current is negligible.
tD
Discharge time at given AC frequency. Will be a maximum of 10ms (½ period duration) at 50Hz.
ΔVMAX
Peak rectified supply voltage minus LED string forward voltage or minimum ZLED7x20 supply voltage, whichever is greater.
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
20 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Example: For an application with 3 LEDs with 3.2V forward voltage each driven at 0.33A and supplied with
rectified 24VAC, a minimum bypass capacitor C1 of 220μF or 330μF might be adequate. Compared to the
calculation, a safety margin of about 50% must be added to consider temperature effects and aging.
0.33A * 10ms
C1MIN 
24V * 2  3 * 3.2V
 135F
(10)
A second function of C1 is to bypass the current ripple of the switching converter and thus prevent it from
disturbing a stable IC supply or backlash on the power supply circuit. For this reason, even in DC-supplied
applications, the use of an adequate C1 might be useful. The defining parameters are now as shown in
equation (11):
C1MIN 
I AVG * t ON
VRIPPLE
(11)
Where:
Symbol
Description
IAVG
Average nominal LED string current.
tON
On time of the internal MOSFET output switch.
Note: tON must be longer than tONmin=200ns.
VRIPPLE
Permissible voltage ripple on the supply voltage.
Example: For an application of 3 LEDs driven at 0.33A and supplied with 24VDC, a maximum ripple of 10% is
allowed. The ZLED7x20 is operated at 150kHz with a duty cycle of 0.4 leading to an on time of 2.67μs. As
calculated in equation 12, a capacitor C1 of 470nF may be adequate, again including a safety margin of about
50%.
C1MIN 
0.33A * 2.67s
 367nF
24V * 0.1
(12)
To achieve maximum stability over temperature and voltage, an X7R, X5R, or better dielectric is recommended
while Y5V must be avoided.
3.3.4
De-bouncing Capacitor C2
External capacitor C2 minimizes ground bounce during switching of the internal MOSFET output switch. Ground
bounce is typically caused by parasitic inductance and resistance due to the distance between the grounds for the
power supply and the ZLED7x20 GND pin. Use a 0.1μF, X7R ceramic capacitor to ground for C2.
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
21 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
3.3.5
Capacitor C3 for Reducing Output Ripple
If required, the C3 can be used to reduce peak-to-peak ripple current in the LED string. Low ESR capacitors
should be used because the efficiency of C3 largely depends on its ESR and the dynamic resistance of the LEDs.
For an increased number of LEDs, using the same capacitor will be more effective. Lower ripple can be achieved
with higher capacitor values, but this will increase start-up delay by reducing the slope of the LED voltage as well
as cause increased current during converter start-up. The capacitor will not affect operating frequency or efficiency. For a simulation or bench optimization, C3 values of a few μF are an applicable starting point for the given
configuration. Ripple current reduction is approximately proportional to the value of C3.
3.3.6
Diode D1
The flyback diode D1 must have a continuous current rating greater than the maximum output load current and a
peak current rating higher than the peak L1 coil current. Important: Use a low-capacitance, fast Schottky diode
that has low reverse leakage at the maximum operating temperature and maximum operating voltage for the
application to avoid excess power dissipation and optimize performance and efficiency. For silicon diodes, there is
a concern that the higher forward voltage and increased overshoot from reverse recovery time could increase the
peak LX pin voltage (VLX). The total voltage VLX (including ripple voltage) must not be >50V.
3.4
Application Circuit Layout Requirements
The following guidelines are strongly recommended when laying out application circuits:
 Important: Locate the L1 inductor and the C1 input decoupling capacitor as close as possible to the
ZLED7x20 to minimize parasitic inductance and resistance, which can compromise efficiency. Use low
resistance connections from L1 to the LX and VIN pins.
 All circuit board traces to the LX pin must be as short as possible because it is a high-speed switching
node.
 If the ADJ pin floats, all circuit board traces to the ADJ pin must be as short as possible to reduce noise
pickup.
 Do not lay out high-voltage traces near the ADJ pin because if the board is contaminated, leakage current
can affect the ADJ pin voltage and cause unintended output current. To further reduce this risk, use a
ground ring around the ADJ pin. (Also see section 2.8 regarding the ZLED7x20’s protection circuitry for
preventing excessive output current.)
 To minimize ground bounce, locate the 0.1μF external capacitor C2 as close as possible to the VIN pin and
solder the ZLED7x20’s GND pin directly to the ground plane. (Also, see section 3.3.4 regarding ground
bounce.)
 Because Rs is typically a low value resistor, it is important to consider the resistance of the traces in series
with RS as part of the total current sense resistance. Use traces that are as short and wide as possible to
minimize this effect.
 The ZLED7x20’s thermal pad must be grounded.
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
22 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
4
ESD Protection
All pins have an ESD protection of  ±3500V according to the Human Body Model (HBM). The ESD test follows
the Human Body Model with 1.5 kΩ/100 pF based on MIL 883-H, Method 3015.8.
5
Pin Configuration and Package
5.1
SOT89-5 Package Pin-out and Dimensions for the ZLED7020
Figure 5.1
ZLED7020 Pin Configuration – SOT89-5 Package
1
5
LX
VIN
2
GND
ADJ
Table 5.1
Thermal Pad
3
4
ISENSE
ZLED7020 Pin Descriptions—SOT89-5 Package
Pin
No.
LX
1
Drain of internal power switch
GND
2
Ground
ADJ
3
On/off and brightness control input
ISENSE
4
Current adjustment input. Resistor RS from ISENSE to VIN determines the nominal average output
current. IOUTnom =0.1V/RS
Thermal Pad
VIN
Data Sheet
June 11, 2014
Description (Also see section 3.3 for layout guidelines)
Connect to GND.
5
Input voltage (6V to 40V).
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
23 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Figure 5.2
SOT89-5 Package Dimensions for the ZLED7020
D
A
D1
E1
E
b1
L
e
b
c
e1
Symbol
Dimension (mm)
Min
Max
A
1.400
1.600
b
0.320
0.520
b1
0.360
0.560
c
0.350
0.440
D
4.400
4.600
D1
1.400
1.800
E
2.300
2.600
E1
3.940
4.250
e
1.500 Typical
e1
2.900
3.100
L
0.900
1.100
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
24 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
5.2
DFN-5 Package Pin-out and Dimensions for the ZLED7320, ZLED7520 and ZLED7720
Figure 5.3
ZLED7320, ZLED7520 & ZLED7720 Pin Configuration — DFN-5 Package
LX
1
GND
2
ADJ
3
5
5
1
2
4
TOP
Table 5.2
VIN
ISENSE
4
3
BOTTOM
ZLED7320, ZLED7520 & ZLED7720 Pin Descriptions — DFN-5 Package
Pin
No.
LX
1
Drain of internal power switch
GND
2
Ground
ADJ
3
On/off and brightness control input
ISENSE
4
Current adjustment input. Resistor RS from ISENSE to VIN determines the nominal average output
current. IOUTnom =0.1V/RS
Thermal Pad
VIN
Data Sheet
June 11, 2014
Description (Also see section 3.3 for layout guidelines)
Connect to GND.
5
Input voltage (6V to 40V).
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
25 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
Figure 5.4
DFN-5 (DFN4*4-05L) Package Dimensions for the ZLED7320, ZLED7520 & ZLED7720
B
j
k
A
i
k1
h
g
D
e
m
f
n
C
Symbol
Dimension (mm)
Min
Max
A
3.95
4.05
B
3.95
4.05
C
0.70
0.80
D
0.37
0.47
e
0.75
0.95
f
2.17
2.42
g
h
1.50
0.41
0.51
i
0.55
j
1.70
k
1.75
k1
1.40
1.55
m
0.000
0.050
n
Data Sheet
June 11, 2014
0.200
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
26 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
6
Ordering Information
Ordering Information
Product Sales Code Description
Package
ZLED7020-ZI1R
ZLED7020 – High Current (1200mA) 40V LED Driver with Internal Switch
SOT89-5 (Tape & Reel)
ZLED7320-ZI1R
ZLED7320 – High Current (1000mA) 40V LED Driver with Internal Switch
DFN-5 (Tape & Reel)
ZLED7520-ZI1R
ZLED7520 – High Current (750mA) 40V LED Driver with Internal Switch
DFN-5 (Tape & Reel)
ZLED7720-ZI1R
ZLED7720 – High Current (350mA) 40V LED Driver with Internal Switch
DFN-5 (Tape & Reel)
ZLED7020KIT-D1
ZLED7020-D1 Demo Board, 1 ZLED-PCB8 and 5 ZLED7020 ICs
Kit
ZLED-PCB8
Test PCB with one 5W white High Brightness (HB) LED, cascadable to one
multiple LED string
Printed Circuit Board (PCB)
ZLED-PCB2
10 unpopulated test PCBs for modular LED string with footprints of 9 common
HB LED types
Printed Circuit Board (PCB)
7
Related Documents
Note: X_xy refers to the current revision of the document.
Document
File Name
ZLED7x20 Feature Sheet
ZLED7X20_Family_Feature_Sheet_Rev_X_xy.pdf
ZLED7020 Application Note—PCB Layout *
AppNote_PCB_Layout_ZLED7020_Rev_X_xy.pdf
Visit the ZLED7x20 product page http://www.zmdi.com/zled7x20-family on ZMDI’s website www.zmdi.com or
contact your nearest sales office for the latest version of these documents.
Note: Documents marked with an asterisk (*) are located on the LED Drivers application notes web page,
http://www.zmdi.com/zled-application-notes-white-papers under the heading “Technical Documents (TN) and
Application Notes (AN).” A free customer login is required to access these documents. To obtain a login account,
click on Login in the upper right corner of any ZMDI web page and follow the instructions.
8
Glossary
Term
Description
ESD
Electrostatic Discharge
EMF
Electromagnetic Force
ESR
Equivalent Series Resistance
PWM
Pulse Width Modulation
Data Sheet
June 11, 2014
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
27 of 28
ZLED7x20 Family
High Current 40V LED Driver with Internal Switch
9
Document Revision History
Revision
Date
Description
1.00
June 27, 2011
First issue.
1.10
August 9, 2011
Update to Demo Kit description.
1.20
August 12, 2011
Update to include ZLED7520 & ZLED7720.
Update for Demo Kit description
1.30
February 6, 2012
Update to include operating junction temperature.
1.40
June 11, 2014
Update to add new section 2.4 regarding requirements if VIN has a high slew rate.
Updates for cover and page header imagery.
Updates for ZMDI contact information.
Addition of “Related Documents” and “Glossary” sections.
Sales and Further Information
www.zmdi.com
[email protected]
Zentrum Mikroelektronik
Dresden AG
Global Headquarters
Grenzstrasse 28
01109 Dresden, Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
Central Office:
Phone +49.351.8822.306
Fax
+49.351.8822.337
USA Phone 1.855.275.9634
Phone +1.408.883.6310
Fax
+1.408.883.6358
European Technical Support
Phone +49.351.8822.7.772
Fax
+49.351.8822.87.772
DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Zentrum Mikroelektronik Dresden AG (ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The
information furnished hereby is believed to be true and accurate. However, under no circumstances shall ZMD AG be liable to any customer,
licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or
in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any
customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for
any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty,
tort (including negligence), strict liability, or otherwise.
European Sales (Stuttgart)
Phone +49.711.674517.55
Fax
+49.711.674517.87955
Data Sheet
June 11, 2014
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
Zentrum Mikroelektronik
Dresden AG, Korea Office
U-space 1 Building
11th Floor, Unit JA-1102
670 Sampyeong-dong
Bundang-gu, Seongnam-si
Gyeonggi-do, 463-400
Korea
Phone +82.31.950.7679
Fax
+82.504.841.3026
© 2014 Zentrum Mikroelektronik Dresden AG — Rev. 1.40.
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
28 of 28