AN8041S Datasheet, PDF (1/15 Pages) Panasonic Semiconductor – Liquid crystal backlight control IC

Voltage Regulators
AN8041S
Liquid crystal backlight control IC
s Overview
The AN8041S is an inverter control IC for liquid
crystal backlight using PWM method. The output
voltage of DC-DC converter and the current of cath-
ode-ray tube can be controlled by using two error
amplifiers, so that the system is designed easily.
Since the n-channel MOSFET can be directly
driven, it is possible to construct a highly effective
power supply.
10.1±0.3
16
9
1
8
Unit: mm
0.3
(0° to 10°)
s Features
• Operating supply voltage: 3.6 V to 34 V ^*
• Totem pole output circuit: Output current of ±500 mA
• Built-in bootstrap circuit
(0.605)
1.27
Seating plane
0.40±0.25
• N-channel power MOSFET can be directly driven
• Built-in two error amplifier circuits allow both the
SOP016-P-0225A
voltage and current control
• Incorporating on/off functions (active-high control input, standby mode current is 5 µA or less)
• Built-in timer latch short-circuit protection circuit
• Maximum oscillation frequency: 500 kHz
Note) _*: The voltage is limited to the range of 3.6 V to 17 V if used in a step-down circuit.
Seating plane
s Applications
• LCD displays, digital still cameras, and PDAs
s Block Diagram
Off ¹⁶
V_REF
2.57 V
On/off
active-high
R
Q
S ^{U.V.L.O. Q}
S.C.P. ⁵
R
Latch Q
S
Constant
current source
OSC
PWM comp.
Bootstrap
14 _CB
13 _Out
S.C.P.
comp.
Error amp. 1
Error amp. 2
8 _FB1
6 _IN+1
7 _IN−1
9 _FB2
11 _IN+2
10 _IN−2
1