at1736 Aimtron Technology, at1736 Datasheet - Page 13

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

Positive Gate-On Linear Regulator Controller
The positive gate-on linear regulator controller consists of FBP and DRVP pins. Use
FBP to determine the positive gate-on output voltage. The DRVP pin is an open-drain
n-channel MOSFET to drive an external pnp transistor. A 6.8kΩ resistor connected
from base to emitter of the external transistor and a 0.47µF output capacitor are
recommended. The driving sink current is at least 1 mA for the design of 20mA output
current. The internal soft-start function adopts rising its reference voltage in the 128
steps (7 bits) to restrain the inrush current and output voltage overshoot.
If the applications where the charge-pump output voltage is over 28V, an external
NPN transistor needs to be inserted in between the DRVP pin and the based of
transistor Q1, or the linear regulator can control the VMAIN and regulate the final
charge pump output as shown in Fig. 2.
Negative Gate-Off Linear Regulator Controller
The negative gate-off linear regulator controller consists of FBN and DRVN pins. Use
FBN to determine the negative gate-off output voltage. The DRVN pin is an
open-drain p-channel MOSFET to drive an external npn transistor. A 6.8kΩ resistor
connected from base to emitter of the external transistor and a 0.22µF output capacitor
are recommended. The driving source current is at least 1 mA for the design of 20mA
output current. The internal soft-start function adopts decreasing its reference voltage
from V
voltage overshoot.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: [phone]
10/19/2007 REV:0.5
AT1736
REF
DRVP
FBP
to 250mV in the 128 steps (7 bits) to restrain the inrush current and output
Figure 2. High Charge-Pump output Application Circuit
VMAIN
VIN or
6.8K
Fax: [phone]
Charge-Pump
Output
Q1
VGH
13
High-Current Operational Amplifiers
AT1736
Preliminary Product Information
LCD Panel Power Supplies with
DRVP
FBP
WWW:
6.8K
Email:
VMAIN
(>14V)
Q1
http://www.aimtron.com.tw
[e-mail]
LX
AT1736
VGH