at1738 Aimtron Technology, at1738 Datasheet - Page 17

• Manufacturer Part Number: at1738
• Description: Lcd Panel Step-up Converter With Analog Multi-function Outputs
• Manufacturer: Aimtron Technology

AT1738
Preliminary Product Information
LCD Panel Step-up Converter with
Analog Multi-Function Outputs
Power-Up Sequence
The AT1738 goes through start-up sequence after power-up. When VIN exceeds
UVLO threshold, the internal reference voltage starts to rise. After reference voltage
reaches regulation, the step-up converter and linear regulators will start up with the
soft-start process.
Once the FB voltage reaches the reference voltage, the gate-on pulse modulator delay
block is also enabled. The gate-on pulse modulator is enabled after the V
goes
DLP
above V
with a constant charging current (20µA typical). Connect an appropriate
REF
capacitor between DLP and GND to obtain the required delay-time.
. 1
24
V
T
=
C
×
(sec)
DELAY
_
SW
DLP
20
.
µ 0
A
Figure 5. Power-up sequence
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
http://www.aimtron.com.tw
Tel: [phone]
Fax: [phone]
WWW:
[e-mail]
8/01/2008 REV: 0.8
Email:
17