datasheet AP1513

7/31/2019 datasheet AP1513

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AP1513PWM Control 2A Step-Down Converter

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use ofthis product. No rights under any patent accompany the sale of the product.

Rev. 1.3 Nov 17, 20051/7

Features

- Input voltage: 3.6V to 18V.- Output voltage: 0.8V to VCC.- Duty ratio: 0% to 100% PWM control- Oscillation frequency: 300KHz typ.- Soft-start, Current limit, Enable function- Thermal Shutdown function- Built-in internal SW P-channel MOS- SOP-8L Pb-Free Package.

Applications

- PC Motherboard- LCD Monitor- Graphic Card- DVD-Video Player- Telecom Equipment- ADSL Modem- Printer and other Peripheral Equipment- Microprocessor core supply- Networking power supply

General Description

AP1513 consists of step-down switching regulatorwith PWM control. These devices include a referencevoltage source, oscillation circuit, error amplifier,internal PMOS and etc.

AP1513 provides low-ripple power, high efficiency,and excellent transient characteristics. The PWMcontrol circuit is able to vary the duty ratio linearlyfrom 0 up to 100%. This converter also contains anerror amplifier circuit as well as a soft-start circuit thatprevents overshoot at startup. An enable function,an over current protect function and a short circuitprotect function are built inside, and when OCP orSCP happens, the operation frequency will be

reduced from 300KHz to 30KHz. Also, an internalcompensation block is built in to minimum externalcomponent count.

With the addition of an internal P-channel Power MOS,a coil, capacitors, and a diode connected externally,these ICs can function as step-down switchingregulators. They serve as ideal power supply units forportable devices when coupled with the SOP8Lmini-package, providing such outstanding features aslow current consumption. Since this converter canaccommodate an input voltage up to 18V, it is alsosuitable for the operation via an AC adapter.

Pin Assignments

1

2

3

4

8

7

6

5

FB

OutputOCSET

AP1513

Output

EN

Vss

Vss

VCC

Pin Descriptions

Name Pin Description

FB 1 Feedback pin.

EN 2

Power-off pinH: Normal operation

(Step-down operation)L: Step-down operationstopped

(All circuits deactivated)

OCSET 3Add an external resistor to setmax output current.

VCC

4 IC power supply pin

Output 56

Switch Pin. Connect externalinductor/diode here. Minimizetrace area at this pin to reduceEMI.

VSS 78 GND Pin


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Anachip Corp.www.anachip.com.tw Rev. 1.3 Nov 17, 2005

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Ordering Information

AP 1513 X X

Package Packing

S: SOP-8L Blank : TubeA : Taping

Block Diagram

Oscillation

Circuit

Reference Voltage

Source with Soft Start

PWM-Switched

Control Circuit

+

-

VssVEN

EN

100uA

OCSET

FB

Vcc

ThermalShutdown

Output

Absolute Maximum Ratings

Symbol Parameter Rating Unit

VCC VCC Pin Voltage VSS - 0.3 to VSS + 20 V

VFB Feedback Pin Voltage VSS - 0.3 to VCC V

VEN EN Pin Voltage VSS - 0.3 to VIN + 0.3 V

VOUTPUT Switch Pin Voltage VSS - 0.3 to VIN + 0.3 V

PD Power Dissipation Internally limited mW

TOPR Operating Temperature Range -20 to +125oC

TSTG Storage Temperature Range -40 to +150oC

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physicaldamage. These values must therefore not be exceeded under any conditions.


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Electrical Characteristics(VIN = 12V, Ta=25C, unless otherwise specified)

Symbol Parameter Conditions Min. Typ. Max. Unit

VIN Input Voltage -- 3.6 - 18 V

VFB Feedback Voltage IOUT=0.1A 0.784 0.8 0.816 V

IFB Feedback Bias Current IOUT=0.1A - 0.1 0.5 A

ISW Switch Current -- 2.5 - - A

ISSSCurrent ConsumptionDuring Power Off

VEN =0V - 10 - A

VOUT/VOUT

Line Regulation VIN=5V~18V - 1 2 %

VOUT/VOUT

Load Regulation IOUT=0.1 to 2A - 0.2 0.5 %

fOSC Oscillation Frequency Measure waveform at SW pin 240 300 400 KHz

fOSC1Frequency of Current Limit

or Short Circuit Protect

Measure waveform at SW pin 10 - - KHz

VSH Evaluate oscillation at SW pin 2.0 - -

VSLEN Pin Input Voltage

Evaluate oscillation stop at SW pin - - 0.8V

ISH -- - 20 - A

ISL

EN Pin Input LeakageCurrent -- - -10 - A

IOCSET OCSET Pin Bias Current -- 75 90 105 A

TSS Soft-Start Time -- 0.3 2 5 ms

VIN=5V, VFB=0V - 110 150RDSON Internal MOSFET RdsonVIN=12V, VFB=0V - 70 100

m

EFFI EfficiencyVIN=12V, VOUT = 5VIOUT=2A

- 92 - %

JAThermal ResistanceJunction-to-Ambient

- 65 -oC/W

Typical Application Circuit

AP1513

+

-VSSEN

CC

RA

RBD1

FB

Vcc Output

CVcc

VOUT

=5V/2A

VIN

ROCSET

OCSET COUT

CIN

Optional

COCSET

CEN

REN

Option

100K

Note: VOUT

= VFB

x (1+RA/R

B)

RB=0.7K~5K ohm

L1

33uH

6.8K

1.3K

3K

0.1uF

+

-

C

0.1uF 470uF470uF

0.1uF

VIN=12V, IMAX=2A

VOUT 2.5V 3.3V 5V

L1 Value 22uH 27uH 33uH


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Typical Performance Characteristics

AP1513 Vin v.s. Frequency

(Vout=3.3V; Iout=0.2A)

310

315

320

325

330

335

340

345

350

0 2 4 6 8 10 12 14 16 18 20Vin (V)

Fosc(KHz)

AP1513 Vin v.s. FB


0.74

0.75

0.76

0.77

0.78

0.79

0.80

0.81

0.82

0.83

0.84

0 2 4 6 8 10 12 14 16 18 20Vin (V)

FB(V)

AP1513 Line Regulation


3.10

3.15

3.20

3.25

3.30

3.35

3.40

0 2 4 6 8 10 12 14 16 18 20Vin (V)

Vout(V)

AP1513 Load Regulation

(Vin=12V)

5.00

5.01

5.02

5.03

5.04

5.05

5.06

5.07

5.08

5.09

5.10

0.0 0.5 1.0 1.5 2.0 2.5Iout (A)

Vout(V)

AP1513 Efficiency

0

10

2030

40

50

60

70

80

90

100

0.0 0.5 1.0 1.5 2.0

Iout (A)

E

fficiency(%)

Vout:5.0V

Vout:3.3V


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Typical Performance Characteristics (Continued)

AP1513 Vout Ripple(Vin=12V; Vout=3.3V; Iout=0.1A)

AP1513 Vout Ripple(Vin=12V; Vout=3.3V; Iout=2A)

Test Circuit

A

FBVCC

VSSEN

open

open

FBVCC

VSSEN

+

-

Oscillation

OUTPUT OUTPUTA

FBVCC

VSSEN

+

-+

-

V

OUTPUT

OCSETOCSET

OCSET


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Function Description

PWM ControlThe AP1513 consists of DC/DC converters thatemploy a pulse-width modulation (PWM) system.In converters of the AP1513, the pulse width variesin a range from 0 to 100%, according to the loadcurrent. The ripple voltage produced by theswitching can easily be removed through a filterbecause the switching frequency remains constant.Therefore, these converters provide a low-ripplepower over broad ranges of input voltage and loadcurrent.

Under Voltage LockoutThe under voltage lockout circuit of the AP1513

assures that the high-side MOSFET driver outputsremain in the off state whenever the supply voltagedrops below 3.3V. Normal operation resumes onceVCC rises above 3.5V.

RDS(ON) Current LimitingThe current limit threshold is setting by the externalresistor connecting from VCC supply to OCSET. Theinternal 100uA sink current crossing the resistorsets the voltage at the pin of OCSET. When thePWM voltage is less than the voltage at OCSET, anover-current condition is triggered.

RIRI OCSETOCSETDS(ON)LOAD =

See above formula for setting the current limitvalue.

Marking Information

8 5

( Top View )

Logo

Part no.

ID code: internal

Year: "01" =2001"02" =2002

Xth week: 01~52

~1 4

AP1513

YY WW X


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Package Information

Package Type: SOP-8L

VIEW "A"

L

C

VIEW "A"

HE

AA2

A1Be

D

7 (4X)0.015x45

7 (4X)

y

Dimensions In Millimeters Dimensions In InchesSymbol

Min. Nom. Max. Min. Nom. Max.

A 1.40 1.60 1.75 0.055 0.063 0.069

A1 0.10 - 0.25 0.040 - 0.100

A2 1.30 1.45 1.50 0.051 0.057 0.059

B 0.33 0.41 0.51 0.013 0.016 0.020

C 0.19 0.20 0.25 0.0075 0.008 0.010

D 4.80 5.05 5.30 0.189 0.199 0.209

E 3.70 3.90 4.10 0.146 0.154 0.161

e - 1.27 - - 0.050 -

H 5.79 5.99 6.20 0.228 0.236 0.244

L 0.38 0.71 1.27 0.015 0.028 0.050

y - - 0.10 - - 0.004 0

O- 8

O0

O- 8

O

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datasheet AP1513