Diodes AP3513E Manuel d'utilisateur télécharger pdf (Page 2)

AP3513E

Document number: DS36692 Rev. 2 - 2

2 of 11

www.diodes.com

January 2014

AP3513E

A Product Line of

Diodes Incorporated

NEW PROD UCT

Pin Descriptions

Pin Number

Pin Name

Function

Bootstrap pin. A bootstrap capacitor is connected between the BS pin and SW pin. The voltage

across the bootstrap capacitor drives the internal high-side NMOS switch.

Supply input pin. A capacitor should be connected between the IN pin and GND pin to keep the DC

input voltage constant.

Power switch output pin. This pin is connected to the inductor and bootstrap capacitor.

GND

Ground pin

Feedback pin. This pin is connected to an external resistor divider to program the system output

voltage. When the FB pin voltage exceeds 1.1V, the over voltage protection is triggered. When the

FB pin voltage is below 0.3V, the oscillator frequency is lowered to realize short circuit protection.

COMP

Compensation pin. This pin is the output of the transconductance error amplifier and the input to the

current comparator. This pin is used to compensate the control loop. Connect a series RC network

from this pin to GND pin. In some cases, an additional capacitor from this pin to GND pin is

required.

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the

regulator, drive it low to turn off. Pull up with 100kΩ resistor for automatic startup.

Soft-start control input pin. SS controls the soft start period. Connect a capacitor from SS to GND to

set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To disable the soft-

start feature, leave SS unconnected.

–

Exposed pad. It should be connected to GND in PCB layout.

Functional Block Diagram

INTERNAL

REGULATOR

OSCILLATOR

GND

COMPFB

COMPARATOR

CURRENT

SENSE

AMPLIFIER

CLK

SLOP

COMP

PWM

COMPARATOR

1.1V

SCP

5µA

180K/500K

925V

2.5V

0.3V

COMPARATOR

1.5V

SHUTDOWN

LOCK

1 2 3 4 5 6 7 ... 10 11

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Diodes AP3513E Manuel d'utilisateur Page 2

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