PT6937 Datasheet, PDF (9/15 Pages) Princeton Technology Corp – White LED Step-Up Converter

White LED Step-Up Converter
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URL: http://www.princeton.com.tw
PT6937
VIN
3V ~ 5V
L1
22 H
D1
CIN
1F
VDC
DIMMING
VIN
SW
90K
PT6937
5K
/SHDN FB
GND
R1
3
D1: FAIRCHILD 1N5819
L1: 3L Electronic Corp. SMTSDR322520C-220K
COUT
0.22 F
PTC PT6937 (4 LEDs)
85%
80%
75%
70%
65%
60%
55%
50%
2
5 10 15 20
LED CURRENT (mA)
Li-Ion to Four White LEDs
VIN
3V ~ 5V
L1
22 H
D1
CIN
1F
VDC
DIMMING
VIN
SW
90K
PT6937
5K
/SHDN FB
GND
R1
3
D1: FAIRCHILD 1N5819
L1: 3L Electronic Corp. SMTSDR322520C-220K
COUT
0.22 F
PTC PT6937 (5 LEDs)
85%
80%
75%
70%
65%
60%
55%
50%
2
5
10
15
LED CURRENT (mA)
Li-Ion to Five White LEDs
VIN = 3V
VIN = 3.6V
VIN = 3V
VIN = 3.6V
PT6937 V1.1
-9-
March, 2006