SS8051T11TB SSC [Silicon Standard Corp.], SS8051T11TB Datasheet - Page 8

• Manufacturer Part Number: SS8051T11TB
• Description: Micro-Power Step-up DC/DC Converter
• Manufacturer: SSC [Silicon Standard Corp.]

Rev.2.01 6/06/2003
TYPICAL APPLICATION CIRCUITS
2.5V to 4.2V
minimize the output ripple voltage, but proper
selection of the inductor and the output capacitor also
plays a big role. If a larger inductance value or a
smaller capacitance value is used, the output ripple
voltage will increase because the capacitor will be
slightly overcharged each burst cycle. To reduce the
V
V
IN
IN
Boost Converter
White LED Driver
C1
C1
4.7 µ F
4.7 µ F
2.5V~5.5V
2.5V~5.5V
ON/OFF Control
VBAT
VBAT
VCC
VCC
SHDN
SHDN
L1
4.7 µ F
4.7 µ F
4.7uH
GND
GND
C1
C1
SW
SW
FB
FB
D1
D1
L1:MURATA LQH3C4R7M24
D1:MOTOROLA MBR0520
VBIAS(+3.3V)
VBIAS(+3.3V)
PWM Dimming Control
PWM Dimming Control
VH=3.3V
VH=3.3V
VL=0V
VL=0V
Freq=160~240Hz
Freq=160~240Hz
PWM Dim
PWM Dim
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390k
R1
R2
120k
VCC
VCC
SHDN
L1
10uh/0.5A
SS8051
GND
GND
C2
C2
22 µ F
22 µ F
5 V
5 V
50mA
50mA
R3
308k 1%
R4
660k 1%
SW
SW
FB
MBR0530
MBR0530
2.5V to 4.2V
2.5V to 4.2V
D1
D1
V
V
IN
IN
Dimming Ratio>50:1
Drive 2~8 White LEDs
output ripple, increase the output capacitance value,
or add a 10pF feed-forward capacitor in the feedback
network of the SS8051 (see the circuits in the
Typical Applications section). To add this small
inexpensive 10pF capacitor will greatly reduce the
output voltage ripple.
120 k_1%
120 k_1%
C2
C2
1 µ F
1 µ F
C1
C1
4.7 µ F
4.7 µ F
R2
R2
SEPIC Converter
D2(Optional)
D2(Optional)
27V
27V
L1
VCC
SHDN
10uH
R1
R1
30_1%
30_1%
GND
GND
SW
FB
C3
1uF
1
L1,L2:MURATA LQH3C100K24
D1:MOTOROLA MBR0520
L2
L2
10 µ H
10 µ H
D1
D1
R1
270k
470k
R2
SS8051
3.3 V
3.3 V
60mA
60mA
C2
C2
22 µ F
22 µ F
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