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HT7937 데이터시트(PDF) 7 Page - Holtek Semiconductor Inc

부품명 HT7937
상세설명  Built-in OVP White LED Step-up Converter
PDF  13 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7937 데이터시트(HTML) 7 Page - Holtek Semiconductor Inc

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HT7937
Rev 1.10
7
January 18, 2010
Start-Up from Shutdown Waveform
Note:
VIN=3.6V, 3 WLEDs, L=10
mH, D= 1N5819,
Ci=Co=1
mF, ILED=20mA
Start-Up from Shutdown Waveform
Note:
VIN=3.6V, 5 WLEDs, L=10
mH, D=1N5819,
Ci=Co=1
mF, ILED=20mA
Operation Waveform
Note:
VIN=3.6V, 5 WLEDs, L=10
mH, D=1N5819,
Ci=Co=1
mF, ILED=20mA
0%
20%
40%
60%
80%
100%
0%
20%
40%
60%
80%
100%
Shutdown PIN PWM Duty
100Hz
200Hz
500Hz
1KHz
VIN=3.6V, L=10uH,
Ci=Co=1uF, 3LEDs
Dimming Control by Shutdown PIN
Operation Waveform
Note:
VIN=3.6V, 3 WLEDs, L=10
mH, D=1N5819,
Ci=Co=1
mF, ILED=20mA
60
65
70
75
80
85
90
95
2.5
3.0
3.5
4.0
4.5
5.0
VIN(V)
6S1P
3S2P
Efficiency vs. VIN



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