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ZXSC4X0 Datasheet(PDF) 12 Page - Diodes Incorporated

Part # ZXSC4X0
Description  DC-DC BOOST SWITCHING CONTROLLERS
PDF  17 Pages
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

ZXSC4X0 Datasheet(HTML) 12 Page - Diodes Incorporated

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ZXSC410/ZXSC420/ZXSC440
Document number: DS33618 Rev. 5 - 2
12 of 17
www.diodes.com
March 2013
© Diodes Incorporated
ZXSC410/ZXSC420/ZXSC440
Application Examples (cont.)
Triple Output TFT Bias Generator
ZXSC410 as Triple Output TFT Bias
Sequencing AVDD and VON
By adding the circuit below to the LCD bias output (VON) of
the converter a 10ms delay can be achieved between AVDD
power up and VON power up. The circuit operates by a delay
in turning the PMOS transistor on, which transfers to a 10ms
delay between input and output of the circuit.
The delay is set by the RC time constant of R1 and C1. The
diode, D1, discharges the gate of the PMOS when the main
system supply is turned off, guaranteeing a delay every turn
on cycle.
System
Voltage
AVDD
C1
0.1µF
R1
470k
LCD Bias
Voltage
VON
Q1
ZXMP3A13F
Sequenced Output
10ms Delay
ZXSC410
Q1 ZXTN
25012EFH
C1
10µF
C5
1µF
C2
47µF
R1
22mΩ
R2
30kΩ
R3
1kΩ
L1
22µH
U1
D1
BAT54
VCC
STDN
GND
VDRIVE
ISENSE
VFB
C7
1µF
C6
1µF
C8
1µF
C4
1µF
VON
27V, 10mA
AVDD
9V, 180mA
VOFF
-9V, 10mA
C3
1µF
VIN
4.2V ~ 3V
BAT54S
BAT54S
BAT54S



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