AN8041S datasheet(5/15 Pages) PANASONIC

Part #	AN8041S

Description	Liquid crystal backlight control IC

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Manufacturer	PANASONIC [Panasonic Semiconductor]

Direct Link	http://www.panasonic.com/industrial/

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5

Voltage Regulators

AN8041S

Pin No.

Equivalent circuit

Description

I/O

4

DTC:



The terminal for connecting a resistor and ca-

pacitor to set the dead-time and soft start period

of PWM output. Input current IDTC is determined

by the timing resistor RT , so that dispersion and

fluctuation with temperature are suppressed. It

is approx.

−12.3 µA when R

T = 15 kΩ.

IDTC =

VRT × 1 [A]

RT

2

5

S.C.P.:



The terminal for connecting a capacitor to set the

time constant of soft start and timer latch short-

circuit protection circuit.

Use a capacitance value in the range of more than

1 000 pF.

The charge current ICHG is determined by the

timing resistor RT , so that dispersion and fluc-

tuation with temperature are suppressed. It is

approx.

−1.3 µA when R

T = 15 kΩ.

ICHG =

VRT × 1 [A]

RT

11

6IN

+1:

I

The noninverted input terminal of the error am-

plifier 1.

For common-mode input, use in the range of

− 0.1 V to +0.8 V.

7IN

−1:

I

The inverted input terminal of the error ampli-

fier 1.

For common-mode input, use in the range of

− 0.1 V to +0.8 V.

8

FB1:

O

The output terminal of the error amplifier 1.

Source current : approx.

−120 µA

Sink current

: approx. 8 mA

Correct the frequency characteristics of the gain

and the phase by connecting a resistor and a ca-

pacitor between this terminal and IN

−1 terminal.

9

FB2:

O

The output terminal of the error amplifier 2.

Source current : approx.

−120 µA

Sink current

: approx. 8 mA

Correct the frequency characteristics of the gain

and the phase by connecting a resistor and a ca-

pacitor between this terminal and IN

−2 terminal.

s Terminal Equivalent Circuits (continued)

Q

S

Latch

0.75 V

R

VREF

ICHG

To U.V.L.O.

5

VREF

6

7

VREF

8

Source current

Sink current

VREF

9

Source current

Sink current

VREF

PWM

comparator

input

IDTC

CDTC

RDTC

4

RT

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