CAV4201 D

CAV4201
350 mA High Efficiency
Step Down LED Driver
Description
The CAV4201 is a high efficiency step−down converter optimized
to drive high current LEDs. A patented switching control algorithm
allows highly efficient and accurate LED current regulation. A single
RSET resistor sets the full scale LED string current up to 350 mA from
supplies as high as 36 V.
The switching architecture of the CAV4201 results in extremely low
internal power dissipation allowing the device to be housed in a tiny
package without the need for dedicated heat sinking. The device is
compatible with switching frequencies of up to 1 MHz, making it ideal for
applications requiring small footprint and low value external inductors.
Enable, analog dimming and LED shutdown control is provided via a
single input pin, CTRL. Additional features include overload current
protection and thermal shutdown. The device is available in the low
profile 5−lead thin SOT23 package and is ideal for space constrained
applications.
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5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
GND
SW
RSET
Features
•
•
•
•
•
•
•
•
•
•
•
(Top View)
LED Drive Current up to 350 mA
Compatible with 12 V and 24 V Standard Systems
Handles Transients up to 40 V
Single Pin Control and Dimming Function
Power Efficiency up to 94%
Drives LED Strings of up to 32 V
Open and Short LED Protection
Parallel Configuration for Higher Output Current
CAV Prefix for Automotive and Other Applications requiring Site
and Change Control
TSOT−23 5−lead Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
MARKING DIAGRAMS
TFYM
TF = Device Code
Y = Production Year (Last Digit)
M = Production Month: 1−9, A, B, C
ORDERING INFORMATION
Device
CAV4201TD−GT3
Applications
•
•
•
•
VBAT
CTRL
Package
Shipping
TSOT−23
(Pb−Free)
3,000/
Tape & Reel
* Plated Finish: NiPdAu
12 V and 24 V Lighting Systems
Automotive and Aircraft Lighting
General Lighting
High Brightness 350 mA LEDs
VBAT
9V
C1
4.7 mF
VBAT
CAV4201
Enable /
Analog Dimming
R1
D
C2
10 mF
350 mA
CTRL
L
RSET
SW
GND
22 mH
D: ON Semiconductor MBR0540
L: Sumida CDRH6D26−220
See Table 4 and Table 5 for external component selection.
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2011
November, 2011 − Rev. 1
1
Publication Order Number:
CAV4201/D
CAV4201
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
VBAT, SW, CTRL
−0.3 to +40
V
RSET
−0.3 to +5
V
1
A
Storage Temperature Range
−65 to +160
_C
Junction Temperature Range
−40 to +150
_C
300
_C
Switch SW peak current
Lead Temperature
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameters
VBAT voltage (Notes 1, 2)
Ratings
Units
6.5 to 36 (Note 1)
V
SW voltage
0 to 36
V
−40 to +125
_C
LED Current
50 to 350
mA
Switching Frequency
50 to 1000
kHz
Ambient Temperature Range
1. The VBAT pin voltage should be at least 3 V greater than the total sum of the LED forward voltages in order to operate at nominal LED current.
2. During power−up, the slew rate of the input supply should be greater than 1 ms for every 5 V increase of VBAT.
Table 3. ELECTRICAL CHARACTERISTICS
(VIN = 13 V, ambient temperature of 25°C (over recommended operating conditions unless otherwise specified))
Symbol
Parameter
Conditions
Min
Typ
Max
Units
0.4
1
mA
IQ
Operating Supply Current on VBAT pin
ISD
Idle Mode Supply Current on VBAT pin
CTRL = GND
VFB
RSET Pin Voltage
2 LEDs with ILED = 300 mA
1.15
1.2
1.25
ILED
Programmed LED Current
R1 = 33 kW
R1 = 10 kW
R1 = 8.25 kW
270
100
300
350
330
2.6
3.1
V
0.9
1.2
V
VCTRL−FULL
90
CTRL Voltage for 100% Brightness
mA
V
mA
VCTRL−EN
CTRL Voltage to Enable LEDs
LED enable voltage threshold
VCTRL−SD
CTRL Voltage to Shutdown LEDs
LED disable voltage threshold
ICTRL
CTRL pin input bias
VCTRL = 3 V
VCTRL = 12 V
40
200
80
RSW
Switch “On” Resistance
ISW = 300 mA
0.9
1.5
TSD
Thermal Shutdown
150
°C
THYST
Thermal Hysteresis
20
°C
86
%
h
Efficiency
Typical Application Circuit
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2
0.4
0.9
V
mA
W
CAV4201
TYPICAL OPERATION CHARACTERISTICS
(VIN = 13 V, ILED = 300 mA, L = 22 mH, C1 = 4.7 mF, C2 = 10 mF, TAMB = 25°C unless otherwise specified)
200
0.8
IDLE CURRENT (mA)
QUIESCENT CURRENT (mA)
1.0
0.6
0.4
0.2
0
8
10
12
14
16
18
20
22
50
0
4
8
12
16
20
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 2. Input Operating Supply Current
Figure 3. Idle Mode Supply Current
(CTRL = 0 V)
24
1.30
VIN = 13 V
200
RSET VOLTAGE (V)
CTRL BIAS CURRENT (mA)
100
0
24
250
150
100
50
0
150
0
2
4
6
8
10
1.25
1.20
1.15
1.10
−40
12
0
40
80
120
CTRL VOLTAGE (V)
TEMPERATURE (°C)
Figure 4. CTRL Input Bias Current
Figure 5. RSET Voltage vs. Temperature
400
1.4
LED CURRENT (mA)
RSET VOLTAGE (V)
1.2
1.0
0.8
+25°C
−40°C
+85°C
0.6
0.4
300
200
100
0.2
0
0
1
2
3
0
4
5
10
15
20
25
30
CTRL VOLTAGE (V)
RSET (kW)
Figure 6. RSET Voltage vs. CTRL Voltage
Figure 7. LED Current vs. RSET
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CAV4201
TYPICAL OPERATION CHARACTERISTICS
(VIN = 13 V, ILED = 300 mA, L = 22 mH, C1 = 4.7 mF, C2 = 10 mF, TAMB = 25°C unless otherwise specified)
700
SWITCHING FREQUENCY (kHz)
SWITCHING FREQUENCY (kHz)
500
150 mA
400
300
300 mA
200
100
0
8
12
16
20
24
400
300 mA
300
200
100
8
12
16
20
24
28
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 8. Switching Frequency vs. Input
Voltage (1 LED)
Figure 9. Switching Frequency vs. Input
Voltage (2 LEDs)
2.0
VIN = 13 V
SW RESISTANCE (W)
150 mA
400
300
300 mA
200
100
−40
0
40
80
1.6
1.2
0.8
0.4
0
120
14
16
18
20
22
Figure 11. Switch ON Resistance vs. Input
Voltage
95
95
90
150 mA
300 mA
24
150 mA
90
300 mA
85
80
75
75
70
12
Figure 10. Switching Frequency vs.
Temperature
100
80
10
INPUT VOLTAGE (V)
100
85
8
TEMPERATURE (°C)
EFFICIENCY (%)
SWITCHING FREQUENCY (kHz)
150 mA
500
0
28
500
EFFICIENCY (%)
600
8
10
12
14
16
18
20
22
70
24
8
10
12
14
16
18
20
22
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 12. Efficiency vs. Input Voltage (1 LED)
Figure 13. Efficiency vs. Input Voltage
(2 LEDs)
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24
CAV4201
TYPICAL OPERATION CHARACTERISTICS
(VIN = 13 V, ILED = 300 mA, L = 22 mH, C1 = 4.7 mF, C2 = 10 mF, TAMB = 25°C unless otherwise specified)
10
LED CURRENT VARIATION (%)
100
EFFICIENCY (%)
95
2 LEDs
90
85
1 LED
80
75
70
100
150
200
250
300
350
6
4
2
0
−2
−4
−6
−8
−10
−40
0
40
80
120
TEMPERATURE (°C)
Figure 14. Efficiency vs. LED Current
Figure 15. LED Current Regulation vs.
Temperature
350
VF = 3.3 V
300
300 mA
250
200
VF = 3.1 V
150
VF = 3.3 V
300
LED CURRENT (mA)
LED CURRENT (mA)
VIN = 13 V
LED CURRENT (mA)
350
150 mA
100
50
0
8
300 mA
250
200
VF = 3.1 V
150
150 mA
100
50
0
4
8
12
16
20
24
0
28
0
4
8
12
16
20
24
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 16. LED Current vs. Input Voltage
(1 LED)
Figure 17. LED Current vs. Input Voltage
(2 LEDs)
SW
5V/div
CTRL
5V/div
Inductor
Current
200mA/
div
LED
Current
200mA/
div
2 ms/div
40 ms/div
Figure 18. Switching Waveforms
Figure 19. CTRL Power−up
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28
CAV4201
TYPICAL OPERATION CHARACTERISTICS
(VIN = 13 V, ILED = 300 mA, L = 22 mH, C1 = 4.7 mF, C2 = 10 mF, TAMB = 25°C unless otherwise specified)
Figure 20. RSET Transient Response
Figure 21. Line Transient Response
(10 V to 13 V)
External Component Selection
Table 4 provides the recommended external components L and C2 that offer the best performance relative to the LED current
accuracy, LED ripple current, switching frequency and component size.
Table 4. EXTERNAL COMPONENT SELECTION
1 LED
2 LEDs
LED Current (mA)
L Inductor (mH)
C2 Capacitor (mF)
L Inductor (mH)
C2 Capacitor (mF)
≥150
22
4.7
22
4.7
< 150
33
4.7
47
2.2
47
10
NOTE:
Larger C2 capacitor values allow to reduce further the LED ripple current if needed.
Table 5. INDUCTOR SELECTION DEPENDING ON VBAT SUPPLY VOLTAGE
VBAT Supply Voltage (V)
Minimum Inductor L (mH)
< 26
22
≥ 26
33
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CAV4201
Table 6. PIN DESCRIPTION
Pin
Name
1
CTRL
Enable and analog dimming control input pin.
2
GND
Ground reference.
3
RSET
RSET pin. A resistor connected between the pin and ground sets the average LED current.
4
SW
5
VBAT
Function
Interface to the inductor.
Supply voltage for the device.
Pin Function
VBAT is the supply input to the device. Typical current
conduction into this pin is less than 1 mA and voltage
transients of up to 40 V can be applied. To ensure accurate
LED current regulation, the VBAT voltage should be 3 V
higher than the total forward voltage of the LED string. A
bypass capacitor of 4.7 mF or larger is recommended
between VBAT and GND.
CTRL is the enable and analog dimming control input. An
internal pull−down current of 20 mA allows the LEDs to
shutdown if CTRL is left floating. Voltages of up to 40 V can
be safely handled by the CTRL input pin.
When the CTRL voltage is less than 0.9 V (typ), the LEDs
will shutdown to zero current. When the CTRL voltage is
greater than about 2.6 V, the device is enabled and full scale
brightness is applied to the LED output. At voltages of less
than around 2.6 V, the LED current is progressively dimmed
until shutdown.
For lamp replacement applications, or applications where
operation in dropout mode is expected, it is recommended
that the CTRL pin voltage be derived from the LED cathode
terminal.
GND is the ground reference pin. This pin should be
connected directly to the ground plane on the PCB.
SW pin is the drain terminal of the internal low resistance
high−voltage power MOSFET. The inductor and the
Schottky diode anode should be connected to the SW pin.
Voltages of up to 40 V can be safely handled on the SW pin.
Traces going to the SW pin should be as short as possible
with minimum loop area. The device can handle safely
“open−LED” or “shorted−LED” fault conditions.
RSET pin is regulated at 1.2 V. A resistor connected
between the RSET pin and ground sets the LED full−scale
brightness current. The external resistance value and the
CTRL pin voltage determine the LED current during analog
dimming. The RSET pin must not be left floating. The
highest recommended resistor value between RSET and
ground is 90 kW.
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CAV4201
Simplified Block Diagram
12 V/24 V
VBAT
30 kW
CTRL
7V
20 mA
OFF−Time Control
SW
EN
PWM
Controller
1.2 V
Reference
+
ON−Time Control
EN
–
R2
1W
1.2 V
RSET
GND
Figure 22. CAV4201 Simplified Block Diagram
Basic Operation
The CAV4201 is a high efficiency step−down regulator
designed to drive series connected high−power LEDs. LED
strings with total forward voltages of up to 32 V can be
driven with bias currents of up to 350 mA.
During the first switching phase, an integrated high
voltage power MOSFET allows the inductor current to
charge linearly until the peak maximum level is reached, at
which point the MOSFET is switched off and the second
phase commences, allowing the inductor current to then
flow through the Schottky diode circuit and discharge
linearly back to zero current.
The switching architecture ensures the device will always
operate at the cross−over point between Continuous
Conduction Mode (CCM) and Discontinuous Conduction
Mode (DCM). This operating mode results in an average
LED current which is equal to half of the peak switching
current.
LED Pin Current
The LED current is set by the external RSET resistor
connected to the regulated output of the RSET pin. An
overall current gain ratio of approximately 2.5 A/mA exists
between the average LED current and the RSET current,
hence the following equation can be used to calculate the
LED current.
LED Current (A) ^ 2.5
V RSET (V)
R SET (kW)
Table 7 lists the various LED currents and the associated
RSET resistors.
Table 7. RSET RESISTOR SELECTION
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LED Current (A)
RSET (kW)
0.10
33
0.15
21
0.20
15
0.25
12
0.30
10
0.35
8.25
CAV4201
APPLICATION INFORMATION
Capacitor Selection
A 10 mF ceramic capacitor C2 across the LED(s) keeps the
LED ripple current within ±15% of nominal for most
applications. If needed, a larger capacitor can be used to
further reduce the LED current ripple. Any resistance in
series with the LED (0.5 W or more) contributes to reduce
the ripple current. The capacitor voltage rating should be
equivalent to the maximum expected supply voltage so as to
allow for “Open−LED” fault conditions. The capacitor
value is independent of the switching frequency or the
overall efficiency.
A 4.7 mF ceramic input capacitor C1 is recommended to
minimize the input current ripple generated on the supply.
Using a larger capacitor value further reduces the ripple
noise appearing on the supply rail.
If a constant capacitance is needed across temperature and
voltage, X5R or X7R dielectric capacitors are recommended.
Input Voltage Range
The minimum supply voltage required to maintain
adequate regulation is set by the cathode terminal voltage of
the LED string (i.e., the VBAT voltage minus the LED string
voltage). When the LED cathode terminal falls below 3 V,
a loss of regulation occurs.
For applications which may occasionally need to
experience supply “dropout” conditions, it is recommended
that the CTRL input be used to sense the LED cathode
voltage. The CTRL pin can either be tied directly to the
cathode terminal (for Lamp Replacement) or connected via
a pass−transistor for PWM lighting applications.
Figure 23 shows the regulation performance obtained in
dropout, when the CTRL pin is configured to sense the LED
cathode voltage.
400
LED CURRENT [mA]
Schottky Diode
300
The peak repetitive current rating of the Schottky diode
must be greater than the peak current flowing through the
inductor. Also the continuous current rating of the Schottky
must be greater than the average LED current. The voltage
rating of the diode should be greater than the peak supply
voltage transient preventing any breakdown or leakage.
ON Semiconductor Schottky diode MBR0540 (40 V,
500 mA rated) is recommended. Schottky diodes rated at
400 mA (or higher) continuous current are fine for most
applications.
300 mA
200
150 mA
100
0
0
1
2
3
4
5
NOTE:
6
CTRL VOLTAGE [V]
Figure 23. “Dropout” Configured LED Current
Schottky diodes with extremely low forward voltages
(VF) are not recommended, as they may cause an
increase in the LED current.
Dimming Methods
(as shown in Typical Application on page 1)
Two methods for PWM dimming control on the LEDs are
described below. The first method is to PWM on the control
pin, the other method is to turn on and off a second resistor
connected to the RSET pin and connected in parallel with R1.
Inductor Selection
A 22 mH minimum inductor value is required to provide
suitable switching frequency across a wide range of input
supply values. For LED current of 150 mA or less, a 33 mH
or 47 mH inductor is more suitable. Inductor values below
22 mH should not be used.
An inductor with at least 700 mA current rating must be
used. Minor improvements in efficiency can be achieved by
selecting inductors with lower series resistance.
PWM on CTRL Pin
A PWM signal from a microprocessor can be used for
dimming the LEDs when tied to the CTRL pin. The duty
cycle which is the ratio between the On time and the total
cycle time sets the dimming factor. The recommended PWM
frequency on the CTRL pin is between 100 Hz and 2 kHz.
Table 8. SUMIDA INDUCTORS
Part Number
L (mH)
I Rated (A)
LED Current (A)
CDRH6D26−220
22
1.0
0.35
CDRH6D28−330
33
0.92
0.35
CDRH6D28−470
47
0.8
0.35
CDRH6D28−560
56
0.73
0.35
Figure 24. PWM at 1 kHz on CTRL Pin
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CAV4201
Operation from High Supply Voltage Above 14 V
300
For operation from a supply voltage above 14 V, it is
recommended to have a slew rate of 1 ms or more for every
5 V increase in VBAT supply. When using a high supply
voltage of 24 V, a 1 W or 2 W resistor in series with the supply,
as shown on Figure 28, is recommended to limit the slew rate
of the supply voltage. A 4.7 mF minimum ceramic capacitor
is placed between the VBAT pin and ground. The
combination of the series resistor R3 and input capacitor C1
acts as a low pass filter limiting the excessive in−rush
currents and overvoltage transients which would otherwise
occur during “hot−plug” conditions, thereby protecting the
CAV4201 driver.
LED CURRENT [mA]
250
200
150
100
50
0
100
80
60
40
DUTY CYCLE [%]
20
0
VBAT R3
Figure 25. LED Current vs. Duty Cycle
24 V 1 W C1
4.7 mF
VBAT
12 V
C1
4.7 mF
VBAT
CAV4201
RSET
R1
10 kW
5V
0V
PWM
control
D
10 mF
4.7 mF
L
33 mH
300 mA
R2
1 kW
Figure 28. 24 V Application with 5 LEDs
Q1
NPN
Operation from High Supply Voltage of 36 V
1 kW
When powering from a high supply voltage of 36 V, a 2 W
resistor in series with the supply is recommended, as shown
on Figure 29, to limit the slew rate of the supply voltage.
Inductor value should be 33 mH or higher.
R5
47 kW
Figure 26. Circuit for PWM on CTRL
VBAT R3
PWM on RSET Pin
36 V 2 W C1
Another dimming method is to place in parallel to R1
another resistor with a FET in series, as shown on Figure 27.
R1 sets the minimum LED current corresponding to 0% duty
cycle. The combined resistor of R1 and Rmax sets the
maximum LED current corresponding to 100% duty cycle.
4.7 mF
R1
10 kW
VBAT
13 V C1
VBAT
CAV4201
RSET
D1
C2
2.2 mF
L
CTRL SW
GND
47 mH
300 mA
R2
4.7 mF
Rmax
C2
R1
22 mH
R4
D1
CTRL SW
GND
L
CTRL
SW
GND
1 kW
R1
10 kW
C2
VBAT
CAV4201
RSET
VBAT
CAV4201
RSET
R1
CTRL
SW
GND
D
OFF ON
Figure 29. 36 V Application with 6 LEDs
10 mF
Parallel Configuration for Driving LEDs Beyond
350 mA
L
22 mH
R2
PWM
control
1 kW
C2
Several CAV4201 devices can be connected in parallel for
driving LEDs with current in excess of 350 mA. The
CAV4201 driver circuits are connected to the same LED
cathode. Figure 30 shows the application schematic for
driving 1 A into one LED with three CAV4201 connected in
parallel. Each CAV4201 is driving the LED with a current
set by its RSET resistor. The resulting LED current is equal
to the sum of each driver current.
Q1
NPN
1 kW
Figure 27. Circuit for PWM on RSET
A resistor value for R1 of less than 90 kW is recommended
to provide better accuracy.
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CAV4201
VIN R5
C1
1W
4.7 μF
R1
8.3 kΩ
U1
VBAT
CAV4201
RSET
CTRL SW
GND
C4
D1
10 μF
1A
L1
22 μH
R4
1 kΩ
C2
4.7 μF
R2
8.3 kΩ
U2
VBAT
CAV4201
RSET
CTRL SW
GND
D2
Figure 31. Open LED Mode
Board Layout
L2
In order to minimize EMI and switching noise, the
Schottky diode, the inductor and the output capacitor C2
should all be located close to the driver IC. The input
capacitor C1 should be located close to the VBAT pin and the
Schottky diode cathode. The CAV4201 ground pin should
be connected directly to the ground plane on the PCB. A
recommended PCB layout with component location is
shown on Figure 32. The LEDs are connected by two wires
tied to both sides of the output capacitor C2. The LEDs can
be located away from the driver if needed.
22 μH
C3
4.7 μF
R3
8.3 kΩ
U3
VBAT
CAV4201
RSET
CTRL SW
GND
D3
L3
22 μH
Figure 30. Three CAV4201 in Parallel for 1 A LED
Open LED Behavior
If the LEDs are not connected, the CAV4201 stops
switching and draws very little current.
At power−up with no load connected, the capacitor C2 is
charged−up by the CAV4201. As soon as the bottom side of
the capacitor (C2−) reaches 0 volt, as shown on Figure 31,
the CAV4201 stops switching and remains in the idle mode
only drawing about 0.4 mA current from the supply.
Figure 32. Recommended PCB Layout
In order to further reduce the ripple on the supply rail, an
optional Pi style filter (C−L−C) can be used. A 10 mH
inductor rated to the maximum supply current can be used.
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CAV4201
PACKAGE DIMENSIONS
TSOT−23, 5 LEAD
CASE 419AE−01
ISSUE O
SYMBOL
D
MIN
NOM
A1
0.01
0.05
0.10
A2
0.80
0.87
0.90
b
0.30
c
0.12
A
e
E1
1.00
0.45
0.15
D
2.90 BSC
E
2.80 BSC
E1
1.60 BSC
E
MAX
e
0.20
0.95 TYP
L
0.30
0.40
L1
0.60 REF
L2
0.25 BSC
0º
θ
0.50
8º
TOP VIEW
A2 A
b
q
L
A1
c
L2
L1
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
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