HV9910
Figure 1: Typical Application Circuit
1N4004 1N4004
68µF
160V
2A
250V
Coilcraft
BUSH-2820R5b
1N4004
BYV26B
280 kΩ
LEDs
VIN
RT
0.1µF
250V
AC Input
85 - 135VAC
0.1µF
250V
750μH
1.0μF
10V
VDD
1N4004
HV9910
2R
NTC
VN2224
0.2Ω
GATE
1N4004
1N4004
1N4004
220nF
400V
68µF
160V
0.1µF
250V
LD
1.0nF
250V
CS
Optional for PFC
GND
PWM_D
LED(s) - a string of HB LEDs, 16 diodes
Figure 2: HV9910 Buck driver for a simple 900mA HB LED (VIN = 8 - 30V)
VIN +1
C7
C6
10µF,
VIN = 8-30V
10µF,
35V
35V
D2
B140-13
HB LED
900mA at 4.5V
VIN -1
L2
1
2
U2
1
R11
267KΩ
220µH
6
7
5
8
RT
VDD
Q2
HV9910
4
2
LD
Gate
VN3205
C5
2.2µF,
10V
PWMD
CS
R10
0.27Ω
3
PWMD1
7
SUPERTEX [ Supertex, Inc ]
