Rainbow-electronics MAX8548 Manual de usuario descargar pdf (Pagina 7)

MAX8545/MAX8546/MAX8548

Low-Cost, Wide Input Range, Step-Down

Controllers with Foldback Current Limit

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Pin Description

PIN NAME FUNCTION

1 COMP/EN

Compensation Input. Pull COMP/EN low with an open-collector or open-drain device to turn

off the output.

2 FB Feedback Input. Connect a resistive-divider network to set V

OUT

. FB threshold is 0.8V.

Internal Chip Supply. Connect V

to VL through a 10Ω resistor. Bypass V

to GND with at

least a 0.1µF ceramic capacitor.

Power Supply for LDO Regulator for V

> 5.5V, and Chip Supply for V

< 5.5V. Bypass V

with

at least a 1µF ceramic capacitor to GND.

5VL

Output of Internal 5V LDO. Connect VL to V

for V

< 5.5V. Bypass VL with at least a 1µF ceramic

capacitor to GND.

6 DL Low-Side External MOSFET Gate-Driver Output. DL swings from VL to GND.

7 GND Ground and Negative Current-Sense Input

8 LX Inductor Switching Node. LX is used for both current limit and the return supply of the DH driver.

9 DH High-Side External MOSFET Gate-Driver Output. DH swings from BST to LX.

10 BST Positive Supply of DH Driver. Connect a 0.1µF ceramic capacitor between BST and LX.

BST

COMP/EN

5V LINEAR

REGULATOR

RAMP

GENERATOR

MAX8545

MAX8546

MAX8548

PWM COMP

ERROR

AMPLIFIER

800mV

REF

SOFT-START

INTERNAL

CHIP SUPPLY

100kHz/

300kHz*

CLOCK

GENERATOR

*SEE SELECTOR GUIDE

CONTROL

LOGIC

TEMPERATURE

SHUTDOWN

GND

FOLD-

BACK

CURRENT-LIMIT

COMPARATOR

Functional Diagram

1 2 3 4 5 6 7 8 9 10 11 12 ... 17 18

MAX8545/MAX8546/MAX8548 1

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Rainbow-electronics MAX8548 Manual de usuario Pagina 7

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