CM494CS datasheet(6/9 Pages) ETC

6 / 9 page

CM494

ADVANCED REGULATING PULSE WIDTH MODULATOR

2000/12/29

Preliminary

Champion Microelectronic Corporation

Page 5

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, over recommended operating free-air

temperature range. Vcc = 15V, f = 10Khz, TA=TJ

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Output Section

Collector off-state current

VCE = 40V, Vcc = 40V

100

µA

Emitter off-state current

Vcc = Vc = 40V, VE = 0

-100

µA

Common-Emitter

VE = 0, lc = 200mA

1.1

1.3

Collector-Emitter

Saturation voltage

Emitter-follower

Vc =15 V, lE = -200mA

1.5

2.5

Output control input current

Vl = VREF

3.5

PWM Comparator Section

Input threshold voltage (Pin 3)

Zero duty-cycle

4.5

Input sink current (Pin 3)

V (Pin 3) = 0.7V

0.3

0.7

Steering Control

V (Pin 13) = 0.4V,Q1 ACTIVE

-200

µA

Input current

V (Pin 13) = 2.4V,Q2 ACTIVE

300

µA

Deadband

500

Zener Diode Circuit（UC495A）

Breakdown voltage

Vcc = 45V, lz = 2mA

.45

Sink current

V (Pin 15) = 1V

0.2

0.3

0.6

Total Device

Vcc = 15V

Standby supply current

Pin 6 at VREF, All other inputs

and outputs open

Vcc = 40V

Under voltage lockout

3.5

6.5

Hysteresis

300

Switching Characteristics（TA = 25℃）

Output voltage rise time

Common-emitter configuration

100

200

Output voltage fall time

RL = 68Ω, CL= 15pF

100

Output voltage rise time

Emitter-follower configuration

100

200

Output voltage fall time

RL= 68Ω, CL= 15pF

100

Note 1: Duration of the short circuit should not exceed one second.

Note 2: Frequency for other values of CT and RT is approximately f = 1.1/RTCT

Note 3: Standard deviation is measure of the statistical distribution about the mean as derived from the formula:

σ =

Σ(Xn -X)

n=1

n-1

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