at1736 Aimtron Technology, at1736 Datasheet - Page 15

• Manufacturer Part Number: at1736
• Description: Lcd Panel Power Supplies With High-current Operational Amplifiers
• Manufacturer: Aimtron Technology

Power-Up Sequence
The AT1736 goes through start-up sequence after power-up. When V
UVLO threshold, the reference voltage starts to rise. After reference voltage reaches
regulation, the step-up converter and linear regulators will start up with the soft-start
procedure.
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
above V
capacitor between DLP and GND to obtain the required delay-time.
Operational Amplifier
These five identical operational amplifiers have the excellent performances as high
output current (150mA), fast slew rate (13V/µs), and wide bandwidth (12MHz) to
drive the distributed series capacitance and resistance of the TFT LCD backplane.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone]
10/19/2007 REV:0.5
C
DLP
=
T
REF
DELAY
0V
0V
0V
0V
0V
0V
0V
0V
with a constant charging current (5µA typical). Connect an appropriate
×
. 5
V
UVLO
µ 0
REF
A
Fax: [phone]
1.05V
Soft-Start period
Delay Time
Adjustable
Figure 3. Power-up sequence
V
DEL
14ms
Negative Linear Regulator Output (VGOFF)
SWCTL
V
V
Step-Up Converter Output (VMAIN)
Positive Linear Regulator Output (VP)
Gate-on Pulse Modulator Output (VGON)
IN
REF
V
15
REF
High-Current Operational Amplifiers
Preliminary Product Information
LCD Panel Power Supplies with
WWW:
Email:
http://www.aimtron.com.tw
[e-mail]
t
AT1736
IN
DLP
exceeds
goes