MAX1531ETJ+ datasheet(10/33 Pages) MAXIM

Part #	MAX1531ETJ+

Description	Multiple-Output Power-Supply Controllers for LCD Monitors

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Manufacturer	MAXIM [Maxim Integrated Products]

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10 / 33 page

Multiple-Output Power-Supply

Controllers for LCD Monitors

10

______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1; including R5, R6, and D2; TA = +25°C, unless otherwise noted.)

Pin Description

MAX1530

MAX1531

NAME

FUNCTION

1

DRV2

Gamma Linear Regulator (LR2) Base Drive. Open drain of an internal N-channel MOSFET.

Connect DRV2 to the base of an external PNP pass transistor to form a positive linear

regulator. (See the Pass Transistor Selection section.)

2

FBL2

Gamma Linear Regulator (LR2) Feedback Input. FBL2 regulates at 1.245V nominal.

Connect FBL2 to the center tap of a resistive voltage-divider between the LR2 output and

AGND to set the output voltage. Place the divider close to the FBL2 pin.

3

FBL3

Gate-On Linear Regulator (LR3) Feedback Input. FBL3 regulates at 1.245V nominal.

Connect FBL3 to the center tap of a resistive voltage-divider between the LR3 output and

AGND to set the output voltage. Place the divider close to the FBL3 pin.

4

DRV3

Gate-On Linear Regulator (LR3) Base Drive. Open drain of an internal N-channel MOSFET.

Connect DRV3 to the base of an external PNP pass transistor to form a positive linear

regulator. (See the Pass Transistor Selection section.)

5–10, 18, 19

—

N. C.

No Connection. Not internally connected.

11

RSTIN

Adjustable Reset Input. RESET asserts low when the monitored voltage is less than the

reset trip threshold. RESET goes to a high-impedance state only after the monitored

voltage remains above the reset trip threshold for the duration of the reset timeout period.

Connect RSTIN to the center tap of a resistive voltage-divider between the monitored

output voltage and AGND to set the reset trip threshold. The internal RSTIN threshold of

90% of 1.238V allows direct connection of RSTIN to any of the device’s positive feedback

pins.

LR5 NORMALIZED LOAD REGULATION

LOAD CURRENT (mA)

40

30

20

10

-0.8

-0.6

-0.4

-0.2

0

-1.0

050

LR5 NORMALIZED LINE REGULATION

INPUT VOLTAGE (V)

-13

-17

-21

0

0.2

0.4

0.6

0.8

1.0

-0.2

-25

-9

20mA LOAD CURRENT

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