HT7937_16 Datasheet, PDF (7/13 Pages) Holtek Semiconductor Inc – Built-in OVP White LED Step-up Converter

HT7937
Note:
Start-Up from Shutdown Waveform
VIN=3.6V, 3 WLEDs, L=10mH, D= 1N5819,
Ci=Co=1mF, ILED=20mA
Note:
Operation Waveform
VIN=3.6V, 3 WLEDs, L=10mH, D=1N5819,
Ci=Co=1mF, ILED=20mA
Note:
Start-Up from Shutdown Waveform
VIN=3.6V, 5 WLEDs, L=10mH, D=1N5819,
Ci=Co=1mF, ILED=20mA
Note:
Operation Waveform
VIN=3.6V, 5 WLEDs, L=10mH, D=1N5819,
Ci=Co=1mF, ILED=20mA
95
90
85
80
75
70
65
60
2.5
3.0
3.5
4.0
4.5
VIN(V)
Efficiency vs. VIN
6S1P
3S2P
5.0
100%
80%
60%
VIN=3.6V, L=10uH,
Ci=Co=1uF, 3LEDs
40%
100Hz
200Hz
500Hz
1KHz
20%
0%
0%
20%
40%
60%
80%
Shutdown PIN PWM Duty
100%
Dimming Control by Shutdown PIN
Rev 1.50
7
June 25, 2016