TC28C46EOE TELCOM [TelCom Semiconductor, Inc], TC28C46EOE Datasheet

TC28C46EOE

Manufacturer Part Number

TC28C46EOE

Description

CMOS CURRENT MODE PWM CONTROLLER

Manufacturer

TELCOM [TelCom Semiconductor, Inc]

Datasheet

1.TC28C46EOE.pdf (10 pages)

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Manufacturer

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Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

TC28C46EOE

Manufacturer:

TELCOM

Quantity:

20 000

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CMOS CURRENT MODE PWM CONTROLLER

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Isolated Output Drive

Low Power CMOS Construction

Low Supply Current ................................. 2mA Typ.

Wide Supply Voltage Operation .............. 8V to 18V

Latch-Up Immunity ................... 500mA on Outputs

Above and Below Rail Input Protection ............. 6V

High Output Drive ................................ 500mA Peak

Current Mode Control

Fast Rise/Fall Time ..................... 50nsec @ 1000pF

High Frequency Operation .......................... 500kHz

UV Hysteresis Guaranteed

Programmable Current Limit

Shutdown Pin Available

Double Ended

Soft Start

Low Prop Delay Current Amp

to Output ......................................... < 350nsec Typ.

Low Prop Delay Shutdown

to Output ......................................... < 400nsec Typ.

TC38C46Pin Compatible with Unitrode UC3846

ESD Protected ................................................. 2 kV

TELCOM SEMICONDUCTOR, INC.

COMPENSATION

SENSE INPUT

– CURRENT

+ CURRENT

AMP INPUT

+ ERROR

– ERROR

SYNC

V IN

R T

C T

TC18C46

TC28C46

TC38C46

ERROR

AMPLIFIER

–

CURRENT SENSE

AMPLIFIER

OSCILLATOR

100 A

+V S +

.65V

– +

–

PWM

COMPARATOR

LIMIT BUFFER

AMPLIFIER

–

UNDER VOLTAGE

LOCK-UP

AMPLIFIER

REFERENCE

LOCKOUT

5.1 VOLT

350mV

–

POSITIVE

FEEDBACK

V REF

PWM LATCH

GENERAL DESCRIPTION

IC. It draws only 2 mA supply current, so it can be driven

without a costly 50-60 Hz transformer. The output drive

stage is capable of high drive currents, 300mA typical.

products so that designers can easily update older designs.

A number of improvements have been added.

isolated drive stage. Unlike its cousin, the TC170, the output

stage of the TC38C46 can be run from a separate power

supply such as a secondary winding on an output trans-

former. This allows for bootstrap start-up of the power

supply.

ORDERING INFORMATION

Part No.

TC18C46MJE

TC28C46EOE

TC28C46EPE

TC38C46COE

TC38C46CPE

The TC38C46 is a current mode CMOS PWM control

The TC38C46 is pin compatible with earlier bipolar

This second generation part has been designed with an

3.5k

SHUTDOWN

COMPARATOR

–

350mV

Configuration

Non-Inverting

CURRENT LIMIT

SOFT START ADJUST

SHUTDOWN

TC38C46 OUTPUTS

LOW IN OFF STATE

V DD

OUTPUT A

OUTPUT B

GROUND

16-Pin Plastic DIP (Narrow)

16-Pin SOIC (Wide)

Pkg./Temperature

– 55 C to +125 C

– 40 C to +85 C

TC18C46

TC28C46

TC38C46

16-Pin CerDIP

0 C to +70 C

TC18/28/28/C46-8 9/23/96

4-101

Related parts for TC28C46EOE

TC28C46EOE Summary of contents

Page 1

... Unlike its cousin, the TC170, the output stage of the TC38C46 can be run from a separate power supply such as a secondary winding on an output trans- former. This allows for bootstrap start-up of the power supply. ORDERING INFORMATION Part No. TC18C46MJE TC28C46EOE TC28C46EPE TC38C46COE TC38C46CPE V REF 2 5.1 VOLT REFERENCE ...

Page 2

... ERROR AMP 11 OUTPUT A – ERROR AMP 10 SYNC COMP CMOS CURRENT MODE PWM CONTROLLERS 150 C/W 55 C/W 125 C/W 45 C/W 250 C/W 75 C/W 16-Pin SOIC (Wide) SHDN OUTPUT TC28C46EOE TC38C46COE GND 5 12 OUTPUT SYNC TELCOM SEMICONDUCTOR, INC. ...

Page 3

CMOS CURRENT MODE PWM CONTROLLERS ELECTRICAL CHARACTERISTICS: +125 C for TC18C46; – +85 C for the TC28C46; and +70 C for the TC38C46 30.1k 270pF Parameter Test ...

Page 4

TC18C46 TC28C46 TC38C46 ELECTRICAL CHARACTERISTICS (Cont – +125 C for TC18C46; – +85 C for the TC28C46; and +70 C for the TC38C46 16V 30.1k; C ...

Page 5

CMOS CURRENT MODE PWM CONTROLLERS Peak Current Limit Setup Resistors R1 and R2 at the CURRENT LIMIT input (pin 1) set the peak current limit (Figure 1). The potential at pin 1 is easily calculated REF ...

Page 6

TC18C46 TC28C46 TC38C46 SWITCH CURRENT 3 CURRENT-SENSE AMPLIFIER – 3 – 0.65V 100 A ERROR AMPLIFIER – Q3 350mV TC18C46 TC28C46 TC38C46 3 CURRENT- SENSE AMPLIFIER 4 + – 3 ...

Page 7

CMOS CURRENT MODE PWM CONTROLLERS 3.15 CURRENT– SENSE AMPLIFIER – – 3 TCX8C46 I S • Figure 3. Transformer Isolated Current Sense Under Voltage Lockout The under voltage lockout circuit ...

Page 8

TC18C46 TC28C46 TC38C46 0.5V 3.5V I CHARGE 8 10 SYNC 2mA C T DISCHARGE CURRENT Selection of Timing Capacitor and Resistor (C & First determine the frequency of operation F the desired " dead" time", ...

Page 9

CMOS CURRENT MODE PWM CONTROLLERS TYPICAL CHARACTERISTICS 18C46 Dead Time vs. C 11000 10000 9000 8000 7000 6000 5000 10k 4000 3000 2k 2000 100k 1000 0 1000 2000 3000 18C46 OSC Frequency vs. C 400 ...

Page 10

TC18C46 TC28C46 TC38C46 PIN DESCRIPTION Pin No. Symbol 1 CURRENT LIMIT, SOFT START 2 V REF 3 – CURRENT SENSE 4 + CURRENT SENSE 5 + ERROR AMP 6 – ERROR AMP 7 COMPENSATION ...

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