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SD42522 PDF даташит

Спецификация SD42522 изготовлена ​​​​«Silan» и имеет функцию, называемую «1A High Power LED Driver».

Детали детали

Номер произв SD42522
Описание 1A High Power LED Driver
Производители Silan
логотип Silan логотип 

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SD42522 Даташит, Описание, Даташиты
1A High Power LED Driver with 636V Input
DESCRIPTION
The SD42522 is a step-down PWM control LED driver with a built-in
power MOSFET. It achieves 1A continuous output current in 6~36V
input voltage range. It provides thermal shutdown circuit, current limit
circuit.
The SD42522 adopts current mode control which provides fast
transient response and simple loop stabilization design. It has high
efficiency up to more than 96%, and has excellent constant current
characteristic when the input/output voltage changed, with the
excellent current accuracy within ±1%
FEATURES
* 6-36V input voltage range
* Maximum 1A output current
* 0.40Ω built-in power MOSFET
* Integrate Jitter function
* 280kHz fixed frequency
* Excellent constant current accuracy ±1%
* High efficiency up to 96%
* Thermal shutdown
* Cycle-by-cycle over current protection
APPLICATIONS
* MR16 LED spotlight
* LED illuminance
* LED street lamp
ORDERING INFORMATION
Part No.
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SD42522
SD42522TR
Package
SOP-8-225-1.27
SOP-8-225-1.27
Marking
SD42522
SD42522
Material
Pb free
Pb free
Package Type
Tube
Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.07.06
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SD42522 Даташит, Описание, Даташиты
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Characteristics
Supply Voltage
Switch Voltage
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Comp Voltage
SENSE voltage
Junction Temperature
Lead Temperature
Storage Temperature
Input Voltage
Operating Temperature
Symbol
VIN
VSW
VCOMP
VSENSE
Tj
TL
TSTG
VIN
TOPR
Ratings
40
-1~VIN+1
-0.3~6
-0.3~VIN
150
260
-65~150
6~40
-40~125
Unit
V
V
V
V
°C
°C
°C
V
°C
ELECTRICAL CHARACTERISTICSUnless otherwise specified, VIN=12VIOUT=700mA,Tamb=25°C
Characteristics
Supply Voltage
Operating Current
Upper Switch Leakage
Current Limit
Maximum Duty Cycle
Oscillator Frequency
Symbol
VIN
IIN
IL
ILIM
Dmax
fosc
Test Condition
VCC=6/40V
VSW=36V
VIN=SENSE=12V
3LED, VIN=9V
Min.
6
1.6
--
250
Typ.
1.5
0
1.9
93
280
Max.
36
2.0
5
2.2
95
320
Unit
V
mA
μA
A
%
kHz
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.07.06
Page 2 of 8









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SD42522 Даташит, Описание, Даташиты
Characteristics
COMP Clamp Voltage
Switch Transistor on
Resistance
VDD voltage
Sampling Voltage Threshold
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Symbol
VCOMP
Test Condition
Open without load
RON
1LED, IOUT=1A
VDD
VIN-
VSENSE
TSD
TSD-hys
No load
Drop voltage between
VIN and SENSE
Min.
1.6
--
5.0
--
Typ.
1.9
0.40
5.2
88
160
30
Max.
2.2
0.6
5.4
--
Unit
V
Ω
V
mV
°C
°C
PIN CONFIGURATION
PIN DESCRIPTION
Pin No. Pin Name I/O
Description
1 SW I Power output.
2
GND
O Ground.
3 SENSE I Current sense pin.
4 VIN O Input supply voltage.
5
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COMP
NC
I/O Compensation pin, connects to external capacitor.
- No Connected.
7 VDD I 5V reference output.
8 NC - No Connected.
FUNCTION DESCRIPTION
The SD42522 is a current mode LED driver. The voltage on compensation pin COMP is proportional to the
current delivered to the load.
At the beginning of a cycle: the upper transistor M1 is off; the COMP pin voltage is higher than the current sense
amplifier output; and the current comparator’s output is low. The rising edge of the 280KHz CLK signal sets the
RS Flip-Flop whose output turns on M1 thus VIN, Rs, LED, inductor and M1 comprises a circuit loop and the
inductor current increases. The inductor current is sensed and amplified by the current sense amplifier. Ramp
compensation is summed to current sense amplifier output and compared to the Gm amplifier output by the
current comparator. When the current sense amplifier plus ramp compensation signal exceeds the comp pin
voltage, the RS Flip-Flop is reset and the chip reverts to its initial M1 off state. The inductor energy storage
released via the circuit loop composed by Rs, LED, inductor and M1 and the current decreases. When next clock
cycle arrives, the upper transistor M1 is on to enter next switch cycle. If the current sense amplifier plus slope
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.07.06
Page 3 of 8










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