Diodes AP6503 Manuel d'utilisateur télécharger pdf (Page 2)

AP6503

Document number: DS35077 Rev. 5 - 2

2 of 15

www.diodes.com

January 2013

P6503

Pin Descriptions

Number

Name

Function

1 BS

High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET switch.

Connect a 0.01µF or greater capacitor from SW to BS to power the high side switch.

2 IN

Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a

4.7V to 23V power source. Bypass IN to GND with a suitably large capacitor to eliminate noise on the input

to the IC. See Input Capacitor.

3 SW

Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC

filter from SW to the output load. Note that a capacitor is required from SW to BS to power the high-side

switch.c

4 GND Ground (Connect the exposed pad to Pin 4).

5 FB

Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage divider

connected to it from the output voltage. The feedback threshold is 0.925V. See Setting the Output Voltage.

6 COMP

Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC

network from COMP to GND. In some cases, an additional capacitor from COMP to GND is required. See

Compensation Components.

7 EN

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

low to turn it off. Attach to IN with a 100k pull up resistor for automatic startup.

8 SS

Soft-Start Control Input. 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 floating.

EP EP EP exposed thermal pad connect to Pin 4 GND

Functional Block Diagram

1.1V

0.3 V

INTERNAL

REGULATORS

Logic

SHUTDOWN

COMPARATOR

0.9V

ERROR

AMPLIFIER

LOCKOUT

COMPARATOR

100/340 KHz

OSCILLATOR

CURRENT

SENSE

AMPLIFIER

OVP

RAMP

CLK

CURRENT

COMPARATOR

EN OK

disable

IN < 4.10V

6uA

COMP

2.5V

0.923 V

GND

100m

Figure 2 Functional Block Diagram

1 2 3 4 5 6 7 ... 14 15

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Diodes AP6503 Manuel d'utilisateur Page 2

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