GX20
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CONFIDENTIAL
IC404 VH+-1R (LT1937): DC - DC
IC405 VHITC7SZ08A-1L (TC7SZ08A): AND GATE
Pin No.
Terminal name
Input/Output
Description of terminal
1
SW
Output
LED voltage output
2
GND
–
Ground
3
FB
Input
LED ground
4
SHDN#
Input
Chip enable
5
GND
–
Ground
6
VIN
Input
Input
Pin No.
Terminal name
Input/Output
Description of terminal
1
A
Input
Signal input
2
B
Input
Signal input
3
GND
–
Ground
4
Y
Output
Logic value output
5
VCC
Input
Power supply
A1
RAMP
GENERATOR
COMPARATOR
DRIVER
1.2MHz
OSCILLATOR
SW
VIN
FB
1
3
GND
2 5
A2
R
Q
S
Q1
0.2 ohms
V
REF
1.25V
SHUTDOWN
95mV
Rc
Cc
SHDN
6
4
5
4
1
2
3
Y
VCC
A
B
GND