Diodes AP3512E Manuel d'utilisateur télécharger pdf (Page 2)

Preliminary Datasheet

18V, 2A Synchronous DC-DC Buck Converter AP3512E

Dec. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

Pin Configuration

M Package MP Package

(SOIC-8) (PSOP-8)

Figure 2. Pin Configuration of AP3512E (Top View)

Pin Description

Pin Number Pin Name Function

1 BS

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.

2 IN

Supply input pin. A capacitor should be connected between

the IN pin and GND pin to keep the DC input voltage

constant.

3 SW

Power switch output pin. This pin is connected to the inductor

and bootstrap capacitor.

4 GND Ground pin

5 FB

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.

6 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.

7 EN

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.

8 SS

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.

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

GND

COMP

GND

COMP

1 2 3 4 5 6 7 ... 12 13

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Diodes AP3512E Manuel d'utilisateur Page 2

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