AP1520 [ANACHIP]

PWM Control 2A Step-Down Converter; PWM控制2A降压转换器


型号：	AP1520
厂家：	ANACHIP CORP
描述：	PWM Control 2A Step-Down Converter PWM控制2A降压转换器转换器
文件：	总7页 (文件大小：194K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

This Anachip version datasheet is replaced

with Diodes Inc. datasheet AP1520

AP1520

PWM Control 2A Step-Down Converter

Features

General Description

- Input voltage: 3.6V to 23V.

AP1520 consists of step-down switching regulator

with PWM control. These devices include a reference

voltage source, oscillation circuit, error amplifier,

internal PMOS and etc.

- Output voltage: 0.8V to V_CC

- Duty ratio: 0% to 100% PWM control

- Oscillation frequency: 300KHz typ.

- Soft-start, Current Limit, Enable function

- Thermal Shutdown function

AP1520 provides low-ripple power, high efficiency,

and excellent transient characteristics. The PWM

control circuit is able to vary the duty ratio linearly

from 0 up to 100%. This converter also contains an

error amplifier circuit as well as a soft-start circuit that

prevents overshoot at startup. An enable function,

an over current protect function and a short circuit

protect function are built inside, and when OCP or

SCP happens, the operation frequency will be

reduced from 300KHz to 30KHz. Also, an internal

compensation block is built in to minimum external

component count.

- 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

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 switching

regulators. They serve as ideal power supply units for

portable devices when coupled with the SOP–8L

mini-package, providing such outstanding features as

low current consumption. Since this converter can

accommodate an input voltage up to 23V, it is also

suitable for the operation via an AC adapter.

Pin Assignments

Pin Descriptions

Name

Description

Feedback pin.

Power-off pin

H: Normal operation

(Step-down operation)

L: Step-down operation

stopped

Vss

OCSET

VCC

(All circuits deactivated)

Add an external resistor to set

max output current.

IC power supply pin

Switch Pin. Connect external

inductor/diode here. Minimize

trace area at this pin to reduce

EMI.

AP1520

OCSET

Output

VCC

Output

5、6

7、8

Output

VSS

GND Pin

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 of

this product. No rights under any patent accompany the sale of the product.

Rev. 1.5 Apr 10, 2006

1/7

This Anachip version datasheet is replaced

with Diodes Inc. datasheet AP1520

AP1520

PWM Control 2A Step-Down Converter

Ordering Information

AP 1520 X X

Packing

Package

S: SOP-8L

Blank : Tube

A : Taping

Block Diagram

Output

Oscillation

Circuit

Reference Voltage

Source with Soft Start

Vcc

PWM-Switched

Control Circuit

Thermal

Shutdown

100uA

V_EN

Vss

OCSET

Absolute Maximum Ratings

Symbol

Parameter

Rating

Unit

V_CC

VCC Pin Voltage

V_SS- 0.3 to V_SS+ 25

V_SS- 0.3 to V_CC

V_SS- 0.3 to V_IN+ 0.3

Internally limited

-20 to +125

V_FB

Feedback Pin Voltage

EN Pin Voltage

V_EN

V_OUTPUT

P_D

Switch Pin Voltage

Power Dissipation

^oC

T_OPR

T_STG

Operating Temperature Range

Storage Temperature Range

-40 to +150

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must

therefore not be exceeded under any conditions.

Anachip Corp.

www.anachip.com.tw

Rev. 1.5 Apr 10, 2006

2/7

This Anachip version datasheet is replaced

with Diodes Inc. datasheet AP1520

AP1520

PWM Control 2A Step-Down Converter

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

Symbol

Parameter

Input Voltage

Conditions

Min.

Typ.

Max. Unit

V_IN

3.6

0.784

0.816

0.5

V_FBFeedback Voltage

I_OUT=0.1A

0.8

0.1

I_FB

Feedback Bias Current

Switch Current

µA

I_SW

2.5

Current Consumption

During Power off

I_SSS

V_EN=0V

µA

∆V_OUT

/V_OUT

∆V_OUT

/V_OUT

Line Regulation

V_IN= 5V~23V

Load Regulation

I_OUT=0.1 to 2A

0.2

300

0.5

360

f_OSCOscillation Frequency

Measure waveform at SW pin

240

KHz

Frequency of Current Limit

f_OSC1

or Short Circuit Protect

V_SH

Evaluate oscillation at SW pin

2.0

0.8

EN Pin Input Voltage

V_SL

Evaluate oscillation stop at SW pin

I_SH

I_SL

EN Pin Input Leakage

Current

-10

µA

I_OCSETOCSET Pin Bias Current

0.3

105

T_SS

Soft-Start Time

V_IN=5V, V_FB=0V

V_IN=12V, V_FB=0V

110

150

100

R_DSONInternal MOSFET Rdson

mΩ

_IN= 12V, V_OUT= 5V

EFFI Efficiency

_OUT= 2A

Thermal Resistance

θ_JA

^oC/W

Junction-to-Ambient

Typical Application Circuit

Vcc

V_IN

V_OUT

Output

22uH

R_A

R_OCSETC_OCSET

C_C

Optional

6.8K

AP1520

Option

C_IN

OCSET

C_OUT

0.1uF 470uF

680uF

V_SS

R_EN

R_B

1.3K

CVcc

100K

0.1uF

C_EN

0.1uF

Note: V_OUT= V_FBx (1+R_A/R_B)

R_B=0.7K~5K ohm

V_IN=12V, I_MAX=2A

V_OUT

2.5V

3.3V

27uH

33uH

L1 Value

22uH

Anachip Corp.

www.anachip.com.tw

Rev. 1.5 Apr 10, 2006

3/7

This Anachip version datasheet is replaced

with Diodes Inc. datasheet AP1520

AP1520

PWM Control 2A Step-Down Converter

Typical Performance Characteristics

AP1520 Vin v.s. FB

(Vout=3.3V; Iout=0.2A)

AP1520 Vin v.s. Frequency

(Vout=3.3V; Iout=0.2A)

0.84

0.83

0.82

0.81

0.80

0.79

0.78

0.77

0.76

0.75

0.74

350

345

340

335

330

325

320

315

310

3.6

10 12 14 16 18

Vin (V)

3.6

10 12 14 16 18

Vin (V)

AP1520 Load Regulation

(Vin=12V)

AP1520 Line Regulation

(Vin=12V; Iout=0.2A)

5.10

5.09

5.08

5.07

5.06

5.05

5.04

5.03

5.02

5.01

5.00

3.40

3.35

3.30

3.25

3.20

3.15

3.10

0.0

1.0

2.0

Iout (A)

3.0

4.0

3.6

10 12 14 16 18

Vin (V)

AP1520 Efficiency

100

Vout:5.0V

Vout:3.3V

0.0

0.5

1.0

Iout (A)

1.5

2.0

Anachip Corp.

www.anachip.com.tw

Rev. 1.5 Apr 10, 2006

4/7

This Anachip version datasheet is replaced

with Diodes Inc. datasheet AP1520

AP1520

PWM Control 2A Step-Down Converter

Typical Performance Characteristics (Continued)

AP1520 Vout Ripple

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

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

Test Circuit

open

OUTPUT

VCC

OCSET

VSS

Enable function test

Feedback function test

OUTPUT

VCC

OCSET

VSS

Operation function test

Anachip Corp.

www.anachip.com.tw

Rev. 1.5 Apr 10, 2006

5/7

This Anachip version datasheet is replaced

with Diodes Inc. datasheet AP1520

AP1520

PWM Control 2A Step-Down Converter

Function Description

PWM Control

R_DS(ON)Current Limiting

The AP1520 consists of DC/DC converters that

employ a pulse-width modulation (PWM) system.

In converters of the AP1520, the pulse width varies

in a range from 0 to 100%, according to the load

current. The ripple voltage produced by the

switching can easily be removed through a filter

because the switching frequency remains constant.

Therefore, these converters provide a low-ripple

power over broad ranges of input voltage and load

current.

The current limit threshold is setting by the external

resistor connecting from V_CCsupply to OCSET. The

internal 100uA sink current crossing the resistor

sets the voltage at the pin of OCSET. When the

PWM voltage is less than the voltage at OCSET, an

over-current condition is triggered.

I_LOADR_DS(ON)I_OCSETR_OCSET

See above formula for setting the current limit

value.

Under Voltage Lockout

The under voltage lockout circuit of the AP1520

assures that the high-side MOSFET driver outputs

remain in the off state whenever the supply voltage

drops below 3.3V. Normal operation resumes once

V_CCrises above 3.5V.

Marking Information

( Top View )

Logo

Part no.

AP1520

YY WW X

ID code: internal

Xth week: 01~52

Year: "01" =2001

"02" =2002

Anachip Corp.

www.anachip.com.tw

Rev. 1.5 Apr 10, 2006

6/7

This Anachip version datasheet is replaced

with Diodes Inc. datasheet AP1520

AP1520

PWM Control 2A Step-Down Converter

Package Information

Package Type: SOP-8L

VIEW "A"

0.015x45

VIEW "A"

(4X)

Dimensions In Millimeters

Dimensions In Inches

Symbol

Min.

1.40

0.10

1.30

0.33

0.19

4.80

3.70

Nom.

1.60

Max.

1.75

0.25

1.50

0.51

0.25

5.30

4.10

6.20

1.27

0.10

8^O

Min.

Nom.

0.063

Max.

0.055

0.040

0.051

0.013

0.0075

0.189

0.146

0.069

0.100

0.059

0.020

0.010

0.209

0.161

0.244

0.050

0.004

8^O

1.45

0.41

0.20

5.05

3.90

1.27

5.99

0.71

0.057

0.016

0.008

0.199

0.154

0.050

0.236

0.028

5.79

0.38

0.228

0.015

0^O

Anachip Corp.

www.anachip.com.tw

Rev. 1.5 Apr 10, 2006

7/7

AP1520 [ANACHIP]

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