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CAT4237 Datasheet(PDF) 5 Page - Catalyst Semiconductor

Part # CAT4237
Description  High Voltage CMOS Boost White LED Driver
PDF  14 Pages
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT4237 Datasheet(HTML) 5 Page - Catalyst Semiconductor

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CAT4237
© Catalyst Semiconductor, Inc.
5
Doc. No. MD-5013, Rev. B
Characteristics subject to change without notice
TYPICAL CHARACTERISTICS
VIN = 3.6V, CIN = 4.7μF, COUT = 0.22µF, L = 33µH with 8 LEDs at 20mA, TAMB = 25ºC, unless otherwise specified.
Quiescent Current vs. VIN (Not Switching)
0
20
40
60
80
100
120
140
2.7 3.0
3.3 3.6
3.9 4.2
4.5 4.8
INPUT VOLTAGE [V]
VFB =0.4V
(not switching)
Quiescent Current vs. VIN (Switching)
0.0
0.5
1.0
1.5
2.0
2.53.0
3.54.0
4.55.0
INPUT VOLTAGE [V]
FB pin voltage vs. Supply Voltage
285
290
295
300
305
310
315
2.7 3.0
3.3 3.6 3.9 4.2
4.5 4.8
INPUT VOLTAGE [V]
8LEDs at 20mA
VOUT= 26V
FB Pin Voltage vs. Output Current
285
290
295
300
305
310
315
0
5
10
15
20
25
30
OUTPUT CURRENT [mA]
8 LEDs
Switching Frequency vs. Supply Voltage
Switching Waveforms
960
980
1000
1020
1040
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8
INPUT VOLTAGE [V]



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