AP8802H

AP8802H
60V 1A LED STEP-DOWN CONVERTER
Description
Pin Assignments
The AP8802H is a step-down DC/DC converter designed to drive
(Top View)
LEDs with a constant current. The device can drive up to thirteen
LEDs, depending on the forward voltage of the LEDs, in series from
SET 1
a voltage source of 8V to 60V. Series connection of the LEDs
8 CTRL
7 GND
GND 2
provides identical LED currents resulting in uniform brightness and
eliminating the need for ballast resistors. The AP8802H switches at
NC 3
frequency up to 700kHz. This allows the use of small size external
VIN
components, hence minimizing the PCB area needed.
AP8802H
4
6 SW
5 SW
PRODUCT
NEW
PRELIMINARY
Maximum output current of AP8802H is set via an external resistor
connected between the VIN and SET input pins.
Dimming is
SO-8EP
achieved by applying either a DC voltage or a PWM signal at the
CTRL input pin. An input voltage of 0.2V or lower at CTRL shuts
down the output at SW and puts the device into a low-current
Applications
standby state.
Features
•
Commercial & industrial lighting
•
Small LCD panel backlight
•
LED driving current up to 1A
•
Appliances interior lighting
•
High efficiency up to 95%
•
Architecture Detail lighting
•
Operating input voltage up to 60V
•
5% nominal accuracy
•
High switching frequency up to 700kHz
•
PWM/DC input for dimming control
•
Built-in output open-circuit protection
•
SO-8EP is available in “Green” Molding Compound (No Br, Sb)

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
Typical Application Circuit
RSET
48V
VIN
0.33
SET
CTRL
AP8802H
C1
2.2µF
AP8802H
Document number: DS32227 Rev. 7 - 2
GND
D1
PDS3200
L1
68µF
SW
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Pin Descriptions
Pin Name
SW
Function
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
GND
GND pin
SET
Set Nominal Output Current Pin. Configure the output current of the device.
PRODUCT
NEW
PRELIMINARY
Dual function dimming control pin with an input impedance approximately 50kΩ.

Input voltage of 0.2V or lower forces the device into low current standby mode and shuts off the output.

A PWM signal (driven by an open-drain/collector source) allows the output current to be adjusted over a wide
range up to 100%.

An analog voltage between 0.3V and 2.5V adjusts the output current between 24% and 200% of the current
set by 0.2V/RS.
CTRL
If the CTRL pin is left open then its voltage will default to VREF
VIN
Input Supply Pin. Must be locally bypassed.
EP
Exposed pad: Internally connected to IC substrate. It should be connected to GND and as large as possible thermal
mass for improved thermal impedance and power dissipation capability. See Land Pad diagrams.
NC
No connection
Functional Block Diagram
Figure. 1 Functional Block Diagram
AP8802H
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Absolute Maximum Ratings (Note 4)
Symbol
Rating
Unit
VIN
VIN pin Voltage
-0.3 to +65
V
VSW
SW Voltage
-0.3 to +65
V
V
PRODUCT
NEW
PRELIMINARY
VCTRL
Parameter
CTRL Pin Input Voltage
-0.3 to +6
VSENSE
SET Voltage (Note 5)
+0.3 to -5
V
TJ
Junction Temperature
150
°C
TLEAD
Lead Temperature Soldering
300
°C
TST
Storage Temperature Range
-65 to +150
°C
Note:
4 All voltages unless otherwise stated are measured with respect to GND.
5. VSENSE is measured with respect to VIN.
Caution:
Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings
only; functional operation of the device at conditions between maximum recommended operating conditions and absolute maximum ratings is not
implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when
handling and transporting these devices.
Recommended Operating Conditions
Symbol
VIN
VCTRLDC
VCTRLL
fOSC
TA
Duty Cycle
Notes:
Min
Max
Unit
Operating Input Voltage relative to GND
Parameter
8.0
60.0
V
Voltage range for 24% to 200% DC dimming relative to GND (Note 6)
0.3
2.5
V
Voltage Low for PWM dimming relative to GND
0
0.2
V
Maximum Switching Frequency (Note 7)
—
625
kHz
Ambient Temperature Range
-40
+125
°C
Using Inductor ≥ 100µH (Note 8)
0.10
0.95
—
6. For 100% brightness either leave floating or connect to 1.25V relative to GND.
7. AP8802H will operate at higher frequencies but accuracy will be affected due to propagation delays.
8. For most applications the LED current will be within 5% over the duty cycle range specified. Duty cycle accuracy is also dependent on
propagation delay. Smaller size inductors can be used but LED current accuracy may be greater than 8% at extremes of duty cycle. This is most
noticeable at low duty cycles (less than 0.1) or when the input voltage is high and only one LED is being driven.
Electrical Characteristics (VIN = 12V, TA = +25°C, unless otherwise specified.)
Symbol
IOUT
IQ
Parameter
Continuous switch current
Quiescent Current
VTHD
Internal Threshold Voltage
VSENSEHYS
Sense threshold hysteresis
SET
SET pin input current
VREF
Internal Reference Voltage
RDS(ON)
On Resistance of MOSFET
ISW_LEAKAGE
Notes:
Conditions
(Note 9)
VSET = VIN -0.2
ISW = 0.8A
Switch leakage current
Min
Typ
Max
Unit
—
—
1
A
-
75
120
μA
190
200
210
mV
—
15
—
%
—
5
—
μA
—
1.25
—
V
—
0.65
1.10
Ω
—
-
8
μA
θJA
Thermal Resistance Junction-to-Ambient
SO-8EP (Note 10)
—
45
—
C/W
θJC
Thermal Resistance Junction-to-Case
SO-8EP (Note 10)
—
7
—
C/W
9. Refer to figure 8 for the device derating curve.
10. Test condition for SO-8EP: Device mounted on FR-4 PCB, 2”x2”, 2oz copper, minimum recommended pad layout on top layer and thermal vias to
bottom layer ground plane. See Land pad diagram For better thermal performance, larger copper pad for heat-sink is needed.
AP8802H
Document number: DS32227 Rev. 7 - 2
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
0.8
1.254
0.7
CTRL VOLTAGE (V)
NON-SWITCHING SUPPLY CURRENT (mA)
1.256
0.9
0.6
0.5
0.4
0.3
1.252
1.250
1.248
0.2
1.246
0.1
1.244
-40 -25 -10 5
0
0
5 10 15 20 25 30 35 40 45 50 55 60
20 35 50 65 80 95 110 125
AMBIENT TEMPERATURE (°C)
Figure. 3 VCTRL vs. Ambient Temperature
INPUT VOLTAGE (V)
Figure. 2 Supply Current (not switching) vs. Input Voltage
1000
1.2
900
800
LED CURRENT (mA)
CTRL VOLTAGE (V)
1.0
0.8
0.6
0.4
700
600
500
400
300
200
0.2
100
0
-40 -25 -10 5
0
20 35 50 65 80 95 110 125
0
1.0
1.5
2.0
RSET RESISTANCE ()
Figure. 5 LED Current vs. R SET
0
0.5
AMBIENT TEMPERATURE (°C)
Figure. 4 RDS(ON) vs. Ambient Temperature
1200
0.5
2.5
800
RSET = 0.3
SWITCHING FREQUENCY (kHz)
RSET = 0.2
1000
LED CURRENT (mA)
PRODUCT
NEW
PRELIMINARY
Typical Characteristics
800
RSET = 0.68
600
400
200
700
600
500
400
300
200
100
0
0
0
0.5
1.0
1.5
2.0
2.5
CTRL VOLTAGE (V)
Figure. 6 LED Current vs. VCTRL
AP8802H
Document number: DS32227 Rev. 7 - 2
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1.0
1.5
2.0
2.5
CTRL VOLTAGE (V)
Figure. 7 Switching Frequency vs. V CTRL
July 2015
© Diodes Incorporated
AP8802H
60V 1A LED STEP-DOWN CONVERTER
Typical Characteristics (TA = +25°C, VIN = 60V, L = 68µH; unless otherwise stated.)
100
8
95
6
90
4
EFFICIENCY (%)
PRODUCT
NEW
PRELIMINARY
OUTPUT CURRENT DEVIATION (%)
10
2
0
-2
-4
85
80
75
-6
70
-8
-10
6
65
12
18
24
30
36
42
48
54
60
6
500
100
450
90
400
80
350
70
DUTY CYCLE (%)
SWITCHING FREQUENCY (kHz)
12
18
24
30
36
42
48
54
60
INPUT VOLTAGE (V)
Figure. 9 Efficiency vs. Input Voltage
INPUT VOLTAGE (V)
Figure. 8 LED Current vs. Input Voltage
300
250
200
150
60
50
40
30
100
20
50
10
0
0
6
12
18
24
30
36
42
48
54
6
60
AP8802H
Document number: DS32227 Rev. 7 - 2
18
24
30
36
42
48
54
60
SUPPLY VOLTAGE (V)
Figure. 11 Duty Cycle vs. Input Voltage
INPUT VOLTAGE (V)
Figure. 10 Switching Frequency vs. Input Voltage
Figure. 12 Steady State Waveforms
12
Figure. 13 Start-Up Showing LED Current Soft Start
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Application Information
LED Current Control
The LED current is controlled by the resistor RSET in Figure 14 connected between VIN and SET. The nominal average output current in the
LED(s) with the CTRL pin open circuit is defined as:
ILED 
VTHD
R SET
PRODUCT
NEW
PRELIMINARY
RSET
48V
0.33
VIN
SET
CTRL
AP8802H
C1
2.2µF
D1
PDS3200
L1
68µF
GND
SW
Figure. 14 Typical Application Circuit
Inductor Selection
This section highlights how to select the inductor suitable for the application requirements in terms of switching frequency, LED current
accuracy and temperature.
500
68
Switching Frequency @I LED = 700mA
450
12V - 3 LEDs
FREQUENCY (kHz)
400
47
24V - 5 LEDs
100
48V - 10 LEDs
350
300
150
68
250
100
220
200
150
150
47
100
470
220
68
100
50
470
150
220
470
0
0
50
100
150
200
250
300
350 400
450
500
INDUCTOR VALUE (µ)
Figure. 15 Switching Frequency vs. Inductor Value
The inductor influences the LED current accuracy that the system is able to provide. The following section highlights how to select the
inductor in relation to the device packages and the LED current, while maintaining the chip temperature below +70°C.
AP8802H
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Applications Information (cont.)
15
14
13
12
11
10
PRODUCT
NEW
PRELIMINARY
9
8
7
6
5
4
3
2
1
0
10
20
30
40
50
SUPPLY VOLTAGE (V)
AP8802H SO-8EP Minimum Recommended Inductor
Figure. 16 Recommended Inductor with 1A LED Current
60
Capacitor Selection
The small size of ceramic capacitors makes them ideal for AP8802H applications. X5R and X7R types are recommended because they
retain their capacitance over wider voltage and temperature ranges than other types such as Z5U. A 2.2μF input capacitor is sufficient for
most intended applications of AP8802H.
A 4.7μF input capacitor is suggested for application with an input voltage equal or higher than 60V.
Diode Selection
Schottky diodes, e.g. B2100 or B1100, with their low forward voltage drop and fast reverse recovery, are the ideal choice for AP8802H
applications.
AP8802H
Document number: DS32227 Rev. 7 - 2
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Applications Information (cont.)
LED Current Adjustment/Dimming
The LED current for the AP8802H can be adjusted by driving the CTRL with a digital signal (PWM dimming) or by driving the CTRL with a DC
voltage between 0.3V and 2.5V (DC dimming).
If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is:
VCTRL VTHD

VREF R SET
PRODUCT
NEW
PRELIMINARY
ILED 
where VREF is nominally 1.25V
1200
LED Current @
0.39
1000
VCTRL = 1.25V
0.2
LED Current @
VCTRL = 2.5V
LED CURRENT (mA)
0.47
LED Current @
800
VCTRL = 0.625V
0.56
600
0.68
0.33
0.2
0.82
0.39
0.47
400
1
1.2
0.56
0.68
0.82
0.33
1.5
1
200
1.5
0.68 0.82
0
0
0.3
2
1.2
0.47
0.6
0.9
1
1.2
1.5
3
2
2
1.2 1.5 1.8 2.1
RSET VALUE ( )
Figure. 17 LED Current vs. R
3
SET and
3
2.4
2.7
3
V CTRL
Figure 17 shows that reducing the CTRL voltage by a factor of 2 also reduces the LED current by a factor of 2. The AP8802H has the ability
vary the LED current by a factor of 2 above the default value set by RSET down to a factor of 0.24 of the nominal LED current. This provides
an 8.33:1 dynamic range of the DC dimming.
A low pass filter (pole frequency ~ 500kHz) on the CTRL pin of the AP8802H automatically provides some soft-start function of the LED
current on initial start-up (this phenomenon can be seen in Figure 7); the built in soft-start period can be increased by the addition of an
external capacitor onto the CTRL pin.
The AP8802H’s dimming range can be increased above this DC dimming factor by applying a PWM signal to the CTRL pin using this
method dimming dynamic ranges above 100 can be achieved.
AP8802H
Document number: DS32227 Rev. 7 - 2
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Applications Information (cont.)
PWM Dimming of LED Current
When a low frequency PWM signal with voltages between 2.5V and a low level of zero is applied to the CTRL pin the output current will be
switched on and off at the PWM frequency. The resultant LED current ILEDavg will be proportional to the PWM duty cycle. See Figure 6.
A Pulse Width Modulated (PWM) signal with a max resolution of 8-bit, can be applied to the CTRL pin to change the output current to a
value above or below the nominal average value set by resistor RSET.
PRODUCT
NEW
PRELIMINARY
To achieve this resolution the PWM frequency has to be lower than 500Hz. The ultimate resolution will be determined by the number of
switching cycles required to get back to nominal LED current once the PWM voltage is high relative to PWM frequency. Lower switching
frequencies and higher PWM frequencies will result in lower PWM dimming dynamic ranges.
Figure. 18 Low Frequency PWM Operating Waveforms
There are different ways of accomplishing PWM dimming of the AP8802H LED current:
Directly Driving CTRL Input
A Pulse Width Modulated (PWM) signal with duty cycle DPWM can be applied to the CTRL pin to adjust the output current to a value above
or below the nominal average value set by resistor RSET. When driving the CTRL with a voltage waveform care should be taken not to
exceed a drive voltage of 2.5V (where extra brightness is required) or 1.25V if a maximum of 100% brightness is required.
A way of avoiding over-driving the CTRL pin is use an open collector/drain driver to drive the CTRL pin.
Driving the CTRL Input via Open Collector Transistor
The recommended method of driving the CTRL pin and controlling the amplitude of the PWM waveform is to use a small NPN switching
transistor. This uses the internal pull-up resistor between the CTRL pin and the internal voltage reference to pull-up CTRL pin when the
external transistor is turned off.
Driving the CTRL Input From a Microcontroller
If the CTRL pin is driven by a MOSFET (either discrete or open-drain output of a micro-controller) then Schottky diode maybe be required
due to high Gate / Drain capacitance, which could inject a negative spike into CTRL input of the AP8802H and cause erratic operation but
the addition of a Schottky clamp diode (eg Diodes Inc. SD103CWS) to ground and inclusion of a series resistor (3.3k) will prevent this.
AP8802H
Document number: DS32227 Rev. 7 - 2
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Applications Information (cont.)
Soft-Start
An external capacitor from the CTRL pin to ground will provide a soft-start delay, by increasing the time taken for the voltage on this pin to
rise to the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator. Adding capacitance
increases this delay by approximately 200µs/nF. The graph below shows the variation of soft-start time for different values of capacitor.
16
PRODUCT
NEW
PRELIMINARY
SOFT-START TIME (ms)
14
12
10
8
6
4
2
0
-2
0
20
40
60
80
100
120
CAPACITANCE (nF)
Soft Start Time vs. Capacitance from ADJ Pint to Ground
Thermal Considerations
The graph below in Figure 19, gives details for power derating. This assumes the device to be mounted on a 25x25mm PCB with 1oz
copper standing in still air.
2.5
POWER DISSIPATION (W)
2
1.5
1
0.5
0
-40
AP8802H
Document number: DS32227 Rev. 7 - 2
-25
-10
5
20
35
50
65
80
AMBIENT TEMPERATURE (°C)
Maximum Power Dissipation
Figure. 19 AP880H Derating Curve
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110
125
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Applications Information (cont.)
Fault Condition Operation
The AP8802H has by default open LED protection. If the LEDs should become open circuit the AP8802H will stop oscillating; the SET pin
will rise to VIN and the SW pin will then fall to GND. No excessive voltages will be seen by the AP8802H.
PRODUCT
NEW
PRELIMINARY
If the LEDs should become shorted together the AP8802H will continue to switch however the duty cycle at which it will operate will change
dramatically and the switching frequency will most likely decrease. The on-time of the internal power MOSFET switch will be significantly
reduced because almost all of the input voltage is now developed across the inductor. The off-time will be significantly increased because
the reverse voltage across the inductor is now just the Schottky diode voltage (See Figure 20) causing a much slower decay in inductor
current. During this condition the inductor current will remain within its controlled levels and so no excessive heat will be generated within
the AP8802H.
Fig. 20 Switching Characteristics (normal open to short LED chain)
AP8802H
Document number: DS32227 Rev. 7 - 2
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Ordering Information
PRODUCT
NEW
PRELIMINARY
AP8802H SP - 13
Device
Package Code
AP8802HSP-13
SP
Note:
Package
Packing
SP : SO-8EP
13 : Tape & Reel
13” Tape and Reel
Packaging
(Note 11)
Quantity
Part Number Suffix
SO-8EP
2500/Tape & Reel
-13
11. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
Marking Information
SO-8EP
( Top View )
8
Logo
Part No.
AP8802H
YY WW X X E
1
AP8802H
Document number: DS32227 Rev. 7 - 2
5
A~Z : Internal code
YY : Year : 08, 09,10~
WW : Week : 01~52; 52
represents 52 and 53 week
X : Internal Code
SO-8-EP
4
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
Package Outline Dimensions (All Dimensions in mm)
SO-8EP
Exposed Pad
8
5
E1
1
H
4
PRODUCT
NEW
PRELIMINARY
F
b
Bottom View
E
9° (All sides)
N
7°
A
e
D
45°
Q
C
4° ± 3°
Gauge Plane
Seating Plane
E0
A1
L
SO-8EP (SOP-8L-EP)
Dim Min Max Typ
A 1.40 1.50 1.45
A1 0.00 0.13
b 0.30 0.50 0.40
C 0.15 0.25 0.20
D 4.85 4.95 4.90
E 3.80 3.90 3.85
E0 3.85 3.95 3.90
E1 5.90 6.10 6.00
e
1.27
F 2.75 3.35 3.05
H 2.11 2.71 2.41
L 0.62 0.82 0.72
N
0.35
Q 0.60 0.70 0.65
All Dimensions in mm
Suggested Pad Layout
SO-8EP
X
Exposed Pad
X1
C1
Y1
Dimensions
X
Y
X1
Y1
C1
C2
Value (in mm)
0.60
1.55
3.30
2.66
5.4
1.27
Y
C2
AP8802H
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AP8802H
60V 1A LED STEP-DOWN CONVERTER
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DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
PRODUCT
NEW
PRELIMINARY
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