TS494 [TSC]

Voltage Mode PWM Controller; 电压模式PWM控制器


型号：	TS494
厂家：	TAIWAN SEMICONDUCTOR COMPANY, LTD
描述：	Voltage Mode PWM Controller 电压模式PWM控制器控制器
文件：	总7页 (文件大小：139K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TS494

Voltage Mode PWM Controller

DIP-16

SOP-16

Supply Voltage Range 7 V to 40V

Output Driving Current 200mA

Oscillator Frequency up to 200KHz

General Description

The TS494 incorporates on a single monolithic chip all the functions required in the construction of a

pulse-width-modulation control circuit. Designed primarily for power supply control, these devices offer the systems

engineer the flexibility to tailor the power supply control circuitry to his application.

The TS494 contains an error amplifier, an on-chip adjustable oscillator, a deed-time control comparator, pulse-steering

control flip-flop, a 5-volt, 5% precision regulator, and output-control circuits. The error amplifier exhibits a

common-mode voltage from –0.3V to Vcc –2V. The dead-time control comparator has a fixed offset that provides

approximately 5% dead time when externally altered. The on-chip oscillatory be bypassed by terminating R_T(pin 6) to

the reference output and providing a sawtooth input to C_T(pin 5), or it may be used to drive the common circuits in

synchronous multiple-rail power supplies. The uncommitted output transistor provide either common-emitter or

emitter-follower output capability. Each device provides for push-pull or single-ended output operation, which may be

selected through the output-control function. The architecture of these devices prohibits the possibility of either output

being pulsed twice during push-pull operation.

The TS494 is offered in SOP-16 and DIP-16 package.

Features

Pin Assignment

Complete PWM Power Control Circuitry

Uncommitted Outputs for 200mA Sink or Source

Current

Output Control Selects Single-Ended or Push –Pull

Operation

Internal Circuitry Prohibits Double Pulse at Either

Output

Variable Dead-Time Provides Control over Total

Range

Internal Regulator Provides a Stable 5-V Reference

Supply with 5% Tolerance

Circuit Architecture Allows Easy Synchronization

Applications

Ordering Information

Charger

Part No.

TS494CD

TS494CS

Operating Temp.

Package

0 ~ +70 ^oC

DIP-16

DC to DC converters

SOP-16

TS494

1-7

2003/12 rev. A

Function Block Diagram

Absolute Maximum Rating

Rating

Power Supply Voltage

Symbol

Vcc

Value

Unit

Collector Output Voltage

Vc1, Vc2

Ic1, Ic2

V_IR

Collector Output Current (each transistor)

Amplifier Input Voltage Range

Power Dissipation @ Ta<=45 ^oC

Thermal Resistance, Junction to Ambient

Operating Junction Temperature

Storage Temperature Range

250

- 30 ~ +40

R_θJA

^oC/W

^oC

125

Tstg

-55 ~ +125

0 ~ +70

Operating Ambient Temperature Range

Derating Ambient Temperature

Recommended Operating Conditions

Rating

Power Supply Voltage

Symbol

Min.

Typ.

Max

Unit

Vcc

Vc1, Vc2

Ic1, Ic2

Vin

Collector Output Voltage

Collector Output Current (each transistor)

Amplifier Input Voltage

200

Vcc-2.0

0.3

- 0.3

Current Into Feedback Terminal

Reference Output Current

Timing Resistor

Ifb

KΩ

Iref

R_T

1.8

0.0047

0.001

500

Timing Capacitor

C_T

Oscillator Frequency

Fosc

200

KHz

TS494

2-7

2003/12 rev. A

Electrical Characteristics (Ta=25 ^oC, V_CC= 15V, C_T= 0.01uF, R_T= 12kΩ; unless otherwise specified.)

REFERENCE SECTION

Parameter

Output voltage (Vref)

Test Conditions*

Io=1mA

Min

4.75

Typ

Max

5.25

Unit

Line regulation

Vcc= 7V to 40V

Io= 1mA to 10mA

∆Ta=Min to Max

Vref= 0

2.0

3.0

0.2

Load regulation

Output voltage change with temp.

Short-circuit output current***

OSCILLATOR SECTION

Frequency

C_T= 0.001µF, R_T= 30KΩ

Vcc= 7V to 40V

3.0

0.1

KHz

Standard deviation of frequency****

Frequency change with voltage

Frequency change with temperature***

C_T= 0.001µF, R_T= 30KΩ

∆Ta= Min to Max

ERROR AMPLIFIER SECTION

Input offset voltage

Vo= (pin 3)= 2.5V

Vcc= 7V to 40V

∆Vo= 3V, R_L=2KΩ,

Vo= 0.5 to 3.5V

R_L= 2KΩ, Vo= 0.5 to 3.5V

∆Vo= 40V

2.0

5.0

µA

Input offset current

250

-1.0

Input bias current

-0.1

Common-mode input voltage range

Open-loop voltage amplification

-0.3 toV_cc-2

Unity-gain bandwidth

800

KHz

Common-mode rejection ratio

Power Supply Rejection Ratio

∆Vcc= 33V, Vo= 2.5V,

R_L= 2KΩ

100

Output sink current (pin 3)

V_ID= -15mV to -5V,

V(pin3)= 0.7V

0.3

2.0

0.7

Output source current (pin 3)

V_ID= 15mV to 5V,

V(pin3)= 3.5V

-4.0

OUTPUT SECTION

Collector off-state current

Emitter off-state current

V_CE= 40V, V_CC= 40V

Vcc= 40V, V_E= 0

V_E= 0, Ic= 200mA

Vc= 15V, I_E= -200mA

V_I= Vref

2.0

100

-100

1.3

µA

Collector-emitter

saturation voltage

Common-emitter

Emitter-follower

1.1

1.5

2.5

Output control input current

DEAD-TIME CONTROL SECTION

Input bias current (pin 4)

3.5

V_I= 0 to 5.25V

-2.0

-10

µA

Maximum duty cycle, each output

Vi(pin 4)= 0, C_T= 0.1µF,

R_T= 12KΩ

Input threshold voltage(pin 4)

Zero duty cycle

3.0

3.3

Maximum duty cycle

TS494

3-7

2003/12 rev. A

Electrical Characteristics (continues)

PWM COMPARATOR SECTION

Parameter

Input threshold voltage (pin 3)

Input sink current (pin 3)

TOTAL DEVICE

Test Conditions*

Min

Typ

4.0

0.7

Max

4.5

Unit

Zero duty cycle

V (pin 3)=0.7V

0.3

Standby supply current

pin 6 at Vref, all

other inputs and

outputs open

Vcc=15V

Vcc=40V

6.0

9.0

Average supply current

SWITCHING CHARACTERISTICS

Output voltage rise time

Vi (pin4)= 2V, See Figure 1

7.5

Common-emitter configuration,

See Figure 3

100

200

100

200

100

Output voltage fall time

Output voltage rise time

Emitter-follower configuration,

See Figure 4

100

Output voltage fall time

UNDERVOLTAGE LOCKOUT SECTION

Turn-on Threshold

Vcc increasing Iref = 1.0mA

5.5

6.43

7.0

Remark:

All typical value except for temperature coefficient are at Ta= 25 ^oC

For conditions shown as Min or Max, use the appropriate value specified under recommended operating

conditions.

All typical values except for parameter changes with temperature are at Ta= 25 ^oC

Duration of the short-circuit should not exceed one second

Standard deviation is a measure of the statistical distribution about the mean as derived from the formula

(x_n− x)²

N −1

⎡

⎤

⎥

⎦

σ = ⎢

∑

⎢

n=1

⎥

⎣

Temperature coefficient of timing capacitor and timing resistor not taken into account

TS494

4-7

2003/12 rev. A

Parameter Measurement Information

TS494

5-7

2003/12 rev. A

Parameter Measurement Information (continues)

TS494

6-7

2003/12 rev. A

SOP-16 Mechanical Drawing

SOP-16 DIMENSION

MILLIMETERS

INCHES

MIN

DIM

MIN

9.80

3.80

1.35

0.35

0.40

MAX

10.00

4.00

1.75

0.49

1.25

MAX

0.393

0.157

0.068

0.019

0.049

0.386

0.150

0.054

0.014

0.016

1.27 (typ)

0.05 (typ)

0.10

0^o

0.25

7^o

0.004

0^o

0.009

7^o

5.80

0.25

6.20

0.50

0.229

0.010

0.244

0.019

DIP-16 Mechanical Drawing

SOP-16 DIMENSION

MILLIMETERS

INCHES

DIM

MIN

17.80

6.22

3.18

0.35

MAX

18.05

6.48

4.45

MIN

MAX

0.710

0.299

0.135

0.020

0.701

0.290

0.125

0.019

0.55

1.27 (typ)

0.05 (typ)

0.25

3.25

7.75

0.31

3.35

8.00

10^o

0.010

0.128

0.305

0.012

0.132

0.315

10^o

TS494

7-7

2003/12 rev. A

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