ANPEC APW38HC43AJI-TR, APW38HC43AJC-TU, APW38HC43AJC-TR, APW38HC42AKI-TU, APW38HC42AKI-TR Datasheet

APW38HC42A/3A/4A/5A

CMOS Current-Mode PWM Voltage Controller

Features General Description

Ultralow start-up current (25µA typical)

•

• Low operating current (2mA typical)

• Fast output rise/fall times :

−15ns rise/10ns fall

• High output drive (1.2A peak current)

• CMOS outputs with rail-to-rail swing

• Current-mode operation up to 1MHz

• Trimmed 5V bandgap reference

• Pin-to-pin compatible with MIC38HC4X

• Trimmed oscillator discharge current

• UVLO with hysteresis

• Low cross-conduction currents

The APW38HC4XA family are fixed frequency, high performance, current-mode PWM controller with 1.2 A drive current capability. Undervoltage lockout circuitry allows the APW38HC42A and APW38HC44A versions to start up at 14.5V and operate down to 9V, and the APW38HC43A and APW38HC45A versions start at 8.4V with operateion down to 7.6V. All versions operate up to 24V. The ultra low start-up current 25µA (typical), and operating current 2mA (typical) have been designed to improve the converter efficiency. High output driving capability up to 1.2A ensures the fast switching to minimize the switching losses. The APW38HC4XA features a trimmed and temperature compensated oscillator discharge current and bandgap reference. APW38HC4XA is available in both 8-pin plastic DIP and SOP packages.

Applications

Current-mode , Off-line , Switched-mode Power

•

Supplies

• Current-mode , DC-to-DC converters

• Various converters ( step-down, step-up, flyback

, forward, and synchronous FET)

Pin Description

COMP

FB

ISNS

RT/CT

1 2

3 4

8 7

6 5

VREF VDD OUT GND

Ordering and Marking Information

APW38HC4XA

Handling Code Temp. Range Package Code

APW384XA J :

APW384XA K :

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders.

APW38HC4XA XXXXX

Package Code J : DIP - 8 K : SOP -8 Temp. Range C : 0 to 70 C I : -40 to 85 C Handling Code TU : T u be TR : Tape & Reel

X - 2/3/4/5 XXXXX - Date Code

°

Copyright  ANPEC Electronics Corp. Rev. A.7 - Jan., 2003

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APW38HC42A/3A/4A/5A

Selection Guide

Duty Cycle

0~96% APW38HC43A APW38HC42A 0~50% APW38HC45A APW38HC44A

Block Diagram

VDD

VREF

RT/CT

FB

2.5V

-

E. A.

+

Startup 8.4V

Minimum Operating 7.6V

5V

Reference

Oscillator

2R

R

UVLO

-

+

T Q

S R

Startup 14.5V

Minimum Operating 9V

Q

OUT

ISNSGNDCOMP

Functional Pin Description

Pin Name Pin Number Function Description

1 COMP Compensation: Connect external compensation network to

modify the error amplifier output.

2 FB Feedback (Input): Error amplifier input. Feedback is 2.5V at

desired output voltage.

3ISNS

4 RT/CT Timing Resistor/Timing Capacitor: Connect external RC

5 GND Ground: Combined analog and power ground. 6 OUT Power Output: Totem-pole output. 7VDD

8 VREF 5V Reference (Output): Connect external RC network.

Copyright  ANPEC Electronics Corp. Rev. A.7 - Jan., 2003

Current Sense (Input): Current sense comparator input. Connect to current sensing resistor or current transformer.

network to select switching frequency.

Analog Supply (Input): Controller ci rcuitry supply input. Return to analog ground (AGND).

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APW38HC42A/3A/4A/5A

Absolute Maximum Ratings

Symbol Parameter Rating Unit

V

DD

V

ISNS

V

FB

T

J

T

STG

T

SDR

V

ESD

Supply Voltage 24 V Current Sense Voltage -0.3 to 5.5 V Feedback Voltage -0.3 to 5.5 V Junction Temperature Range 300 Storage Temperature -65 to 150 Soldering Temperature 300,10 Seconds Minimum ESD Rating ±3 kV

Thermal Characteristics

Symbol Parameter Value Unit

θ

JA

Thermal Resistance in Fr ee A ir

DIP SOP

125 175

Electrical Characteristics

VDD =15V, Note3 ; RT=9.09KΩ; CT=3.3nF; -40oC ≤ TA ≤ 85oC; unless noted

Symbol Parameter Test Conditions

REFEREN CE VO LTA GE

V

REG

Reference Voltage

REF

Line Regulation

line

Load Regulation

load

=25°C, IO(Output Current)=1mA

T

A

12V≤ V 1mA≤ I

DD

O

≤

18V, I

≤

20mA

=5µA

O

Te mp. S t a b i lity 0.2 Total Output Variation Line, Load, Temp. 4.82 5.18 V Output Noise Voltage

10Hz≤ f ≤10kHz, T

= 25oC

A

Long Term Stability TA = 125oC, 1000 hrs 5 25 mV

I

SC

Output Short Circu it -25 -55 -120 mA

OSCILLATOR

F

I

DISCHG

V

Initial Ac curacy

OSC

Voltage Stability Temp . Stability

Clock Ramp Reset Current

Amplitude V

OSC

T

=25°C, Note 4

A

12V≤ V T

≤ TA ≤ T

MIN

TA=25°C, V T

A=TMIN RT/CT

18V

DD

≤

MAX

=2V

RT/CT

to T

MAX

peak to peak 1.6 V

ERROR AMPLIFIER

Input Voltage V

=2.5V 2.42 2.50 2.5 8 V

COMP

APW38HC4XA

Min. Typ. Max.

4.90 5.00 5.10 V 120mV 625mV

50

49 52 55 kHz

0.2 1.0 %

0.03

7.7 8.4 9.0

7.2 8.4 9.5

C/W

°

C

°

C

°

C

°

Unit

mV/°C

V

µ

%/°C

mA

P-P

Copyright  ANPEC Electronics Corp. Rev. A.7 - Jan., 2003

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APW38HC42A/3A/4A/5A

Electrical Characteristics (Cont.)

VDD =15V, Note3 ; RT=9.09KΩ; CT=3.3nF; -40oC ≤ TA ≤ 85oC; unless noted

Symbol Parameter Test Conditions

ERROR AMPLIFIER

I

Input Bias Current VFB=5V 0.1

FB

A

Open Loop Gain

VOL

2≤ V

4V

O

≤

BW Unit y Gain Band widt h 0.7 1. 0 MH z

PSRR Output Sink Current VFB=2.7V, V

Output Source Current VFB=2.3V, V V V

Output Voltage (High) VFB=2.3V, RL=15k to GND 5 5.4 V

OH

Output Voltage (Low) VFB=2.7V, RL=15k to VREF 0.01 1.1 V

OL

12≤ V

DD

≤

18V

COMP COMP

=1.1V 2 7 mA =5V -0.5 -1 mA

CURRENT SENSE

A Gain Notes 1,2 2.85 3.0 3.15 V/V

V

I

Maximum Threshold V

THM

PSRR

Input Bias Current V

ISNS

T

Delay to Output 120 250 ns

D

=5V, Note 1 0.9 1.0 1.1 V

COMP

12≤ V

ISNS

18V, Note 1

DD

≤

=5V 0.1

OUTPUT

t

R

t

F

R

Rise Time

Fall Time

High Sourcing Current = 200mA 6.3

DS(ON)

Low Sinking Current = 200mA 4

DS(ON)

T

=25°C, CL=1nF

A

T

=25°C, CL=1nF

A

UNDERVOLTAGE LOCKOUT

V

DD(ST)

V

DD(MIN)

Start Threshold

Minimum Operating Voltage

APW38H C42 /4A 13.5 14.5 15.5 APW38HC43/5A 7.8 8.4 9.0 APW38HC42/4A 8.0 9.0 10.0 APW38HC43/5A 7.0 7.6 8.2

PULSE WIDTH MODULATOR

D

Maximum Duty Cycle

MAX

Min imum Du ty Cy c le 0

MIN

APW38HC42/3A 94 96 APW38HC44/5A 46 50

TOTAL STANDBY CURRENT

I

DD(ST)

I

DD(OP)

Start-Up Current

Operating Supply Current VFB =V

VDD=13V, A PW38HC42/4A 30 150 V

=7.5V, APW38HC43 /5A 25 150

DD

= 0V, CL=1nF 2.0 4.0 mA

ISNS

Note 1 : Parameter measured at trip point of latch with VFB=0V. Note 2 : Gain defined as :

APW38H C4X A

Min. Typ. Max.

60 70 dB

60 dB

70 dB

15 30 ns 10 20 ns

Unit

A

µ

A

µ

Ω

V V

% %

A

µ

A = , 0<VTH(ISNS)<0.8V

∆VCOMP

∆VTH(ISNS)

Note 3 : Adjust VDD above the start threshold before setting at 15V. Note 4 : Output frequency equals oscillator frequency for the APW38HC42A and APW38HC43A. Output

frequency for APW38HC44A and APW38HC45A equals one half of the oscillator frequency.

Copyright  ANPEC Electronics Corp. Rev. A.7 - Jan., 2003

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