Diodes AP5724 Manuel d'utilisateur télécharger pdf (Page 2)

AP5724

Document number: DS31843 Rev. 4 - 2

2 of 15

www.diodes.com

December 2013

P5724

Pin Descriptions

Pin Name Functions

SW Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.

GND GND pin.

Feedback Pin. Reference voltage is 0.1V. Connect cathode of lowest LED and a sense resister here. Calculate resistor value

according to the formula: R

SET

= 0.1V / ILED

Converter On/Off Control Input. A high input at EN turns the converter On, and a low input turns it off. If On/Off control is not

needed, connect EN to the input source for automatic startup. The EN pin cannot be left floating.

OVP Output Voltage detect pin for over voltage protection.

Input Supply Pin. Must be locally bypassed with 1μF or 2.2μF to reduce input noise.

Functional Block Diagram

1.2MHz

Oscillator

RAMP

Generator

REF

0.1V

Comparator

CONTROL

LOGIC

Driver

GND

Enable

OTP

OVP

Absolute Maximum Ratings (@T

= +25°C, unless otherwise specified.)

Symbol Parameter Rating Unit

VIN Pin Voltage -0.3 to +7 V

VSW SW Voltage -0.3 to +34 V

OVP

OVP Pin Voltage -0.3 to +35 V

Feedback Pin Voltage -0.3 to +7 V

EN EN -0.3 to +7 V

J(MAX)

Maximum Junction Temperature 150 °C

LEAD

Lead Temperature 300 °C

Storage Temperature Range -65 to +150 °C

Caution: Operation above the absolute maximum ratings can cause device failure. These values, therefore, must not be exceeded under any condition.

Operation at the absolute maximum rating for extended periods, may reduce device reliability.

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Diodes AP5724 Manuel d'utilisateur Page 2

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