AZ3844M datasheet, PDF - EEWORLD Datasheet

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AZ3844M: DescriptionCURRENT MODE PWM CONTROLLER; File Size292KB，13 Pages; ManufacturerAAT [Advanced Analog Technology, Inc.]

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AZ3844M Overview

CURRENT MODE PWM CONTROLLER

AZ3844M Preview

Advanced Analog Circuits

Data Sheet

AZ3842/3/4/5

Features

Robust V

REF

Line/Load Regulation

Low Line Regulation : 4mV

Low Load Regulation : 4mV

High Stability of Reference Voltage over a Full

Temperature Range: 0.2mV/

Operating Frequency up to 500KHz

High PWM Frequency Stability over a Full Tem-

perature Range: 2.5%

High PWM Frequency Stability under a Full Sup-

ply Voltage Range: 0.2%

Accurate Over-temperature Protection with Hys-

teresis

UVLO with Hysteresis

CURRENT MODE PWM CONTROLLER

General Description

The AZ3842/3/4/5 are high performance fixed fre-

quency current-mode PWM controller series.

These integrated circuits are optimized for off-line and

DC-DC converter applications with minimum external

components. They feature under-voltage lockout

(UVLO) circuit for low start-up current, trimmed

oscillator for precise duty cycle control, current sense

comparator providing maximum current limiting and a

totem pole output stage for increasing output current.

In addition, these ICs also feature accurate protection

against over-temperature, over-current and maximal

output power.

The AZ3842 and AZ3844 have UVLO thresholds of

15.5V(on) and 10V(off); The corresponding thresholds

for AZ3843 and AZ3845 are 8.4 V(on) and 7.8V(off).

The AZ3842 and AZ3843 can operate approaching

100% duty cycle; AZ3844 and AZ3845 can operate

from zero to 50% duty cycle.

These ICs are available in 3 packages: SOIC-8, DIP-8

and SOIC-14.

Applications

Off-line Converter

DC-DC Converter

Voltage Adapter

CRT Monitor Power Supply

Desktop Power Supply

DVD/STB Power Supply

SOIC-8

DIP-8

SOIC-14

Figure 1. Package Types of AZ3842/3/4/5

March 2003

Rev: 1.0

Advanced Analog Circuits

Data Sheet

AZ3842/3/4/5

M Package

(SOIC-14)

COMP

REF

N/C

PWR V

OUTPUT

GND

PWR GND

CURRENT MODE PWM CONTROLLER

Pin Configuration

P/M Package

(DIP-8/SOIC-8)

COMP

SENSE

REF

OUTPUT

GND

N/C

SENSE

N/C

Figure 2. Pin Configuration of AZ3842/3/4/5 (Top View)

Pin Description

Pin Number

8-pin

14-pin

Pin Name

COMP

SENSE

Function

This pin is the Error Amplifier output and is made available for loop compensation.

The inverting input of the Error Amplifier. It is normally connected to the switching

power supply output through a resistor divider.

A voltage proportional to inductor current is connected to this input. The PWM uses

this information to terminate the output switch conduction.

The Oscillator frequency and maximum Output duty cycle are programmed by con-

necting resistor R

to V

REF

and capacitor C

to ground. Operation to 500 kHz is pos-

sible.

The combined control circuitry and power ground.

This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A

are sourced and sunk by this pin.

The positive supply of the control IC.

This is the reference output. It provides charging current for capacitor C

through

resistor R

This pin is a separate power ground return that is connected back to the power source.

It is used to reduce the effects of switching transient noise on the control circuitry.

The Output high state (V

) is set by the voltage applied to this pin. With a separate

power source connection, it can reduce the effects of switching transient noise on the

control circuitry.

This pin is the control circuitry ground return and is connected back to the power

source ground.

No connection. These pins are not internally connected.

GND

OUTPUT

REF

PWR GND

PWR V

2,4,6,13

GND

N/C

March 2003

Rev: 1.0

Advanced Analog Circuits

Data Sheet

AZ3842/3/4/5

CURRENT MODE PWM CONTROLLER

Functional Block Diagram

GND

7(12)

34V

5(9)

UVLO

S/R

REF

7(11)

(PWR V

)

REF

8(14)

INTERNAL

BIAS

2.50V

VREF

GOOD

LOGIC

4(7)

OSC

(Note)

6(10)

OUTPUT

GND

(PWR GND)

A(B)

A for 8-pin

B for 14-pin

OVER TEMP

PROTECT

ERROR

AMP

2(3)

1(1)

3(5)

5(8)

CURRENT

SENSE

COMPARATOR

PWN

LATCH

Note: Toggle flip-flop used

for 3844/45 only

COMP

SENSE

Figure 3. Functional Block Diagram of AZ3842/3/4/5

Ordering Information

Package

SOIC-8

DIP-8

SOIC-14

Temperature Range

Part Number

AZ3842/3/4/5M

AZ3842/3/4/5P

AZ3842/3/4/5MM

Marking ID

3842/3/4/5M

AZ3842/3/4/5P

AZ3842/3/4/5MM

Packing Type

Tape/Reel/Tube

Tube

Tape/Reel

-40

C~85

March 2003

Rev: 1.0

Advanced Analog Circuits

Data Sheet

AZ3842/3/4/5

CURRENT MODE PWM CONTROLLER

Absolute Maximum Ratings (Note 1, 2)

Parameter

Supply Voltage

Output Current

Analog Inputs (8-pin: pin2,3, 14-pin: pin3,5)

Error Amp Output Sink Current

Power Dissipation at T

< 25

C (DIP-8)

Power Dissipation at T

<25

C (SOIC-8)

Power Dissipation at T

<25

C (SOIC-14)

Storage Temperature Range

Lead Temperature (Soldering, 10sec)

Symbol

Vcc

V(ANA)

SINK

(E.A)

(Note 3)

STG

LEAD

Value

土

-0.3 to 6.3

1000

460

725

-65 ~+150

+300

Unit

Note 1:

Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the

device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indi-

cated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended

periods may affect device reliability.

Note 2: All voltages are with respect to pin 5 and all currents are positive into specified terminal.

Note 3: Board thickness 1.6mm, board dimension 90mm

90mm.

Recommended Operating Conditions

Parameter

Oscillation Frequency

Symbol

Min

-40

Max

500

Unit

KHz

Ambient Temperature

March 2003

Rev: 1.0

Advanced Analog Circuits

Data Sheet

AZ3842/3/4/5

CURRENT MODE PWM CONTROLLER

Electrical Characteristics

=15V, R

=10kΩ C

=3.3nF, T

= -40

C to +85

C, unless otherwise specified.)

Parameter

REFERENCE SECTION

Reference Output Voltage

Line Regulation

Load Regulation

Short Circuit Output Current

Temperature Stability

Output Noise Voltage

Long Term Stability

OSCILLATOR SECTION

Oscillation Frequency

Frequency Change with Voltage

Oscillator Amplitude

Temperature Stability

ERROR AMPLIFIER SECTION

Input Bias Current

Input Voltage

Open Loop Voltage Gain

Power Supply Rejection Ratio

Output Sink Current

Output Source Current

High Output Voltage

Low Output Voltage

CURRENT SENSE SECTION

Gain

Maximum Input Signal

Power Supply Rejection Ratio

Input Bias Current

Delay to Output

OUTPUT SECTION

Low Output Voltage

High Output Voltage

Rise Time

SINK

= 20mA

SINK

= 200mA

SOURCE

= 20mA

SOURCE

= 200mA

=25

C, C

=1nF (Note 6)

(MAX)

PSRR

BIAS

Vpin3 = 0 to 2V (Note 6)

(Note 4, 5)

Vpin1=5V(Note 4)

12V

≤

25V (Note 4, 6)

2.85

0.9

BIAS

VOL

PSRR

SINK

SOURCE

(Note 6)

Vpin 1=2.5V

≤

12V

≤

25V

Vpin2=2.7V, Vpin1=1.1V

Vpin2=2.3V, Vpin1=5V

Vpin2=2.3V, R

=15kΩ to GND

Vpin2=2.7V, R

=15kΩ to Pin 8

2.42

-0.5

∆f/f

OSC

=25

12V

≤

25V

Pin 4, peak to peak (Note 6)

(Note 6)

=85

C, 1000 hours

REF

∆V

REF

∆V

REF

=25

C, I

REF

=1mA

12V

≤

≤25V

1mA

≤

REF

≤20mA

=25

4.90

Symbol

Conditions

Min

Typ

Max

Unit

5.00

-100

0.2

1.7

2.5

-0.1

2.50

-0.8

0.8

-3

150

0.1

1.4

5.10

-180

0.4

mV/

µV

KHz

-2

2.58

µA

1.1

3.15

1.1

-10

300

0.4

2.2

V/V

µA

150

March 2003

Rev: 1.0

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