UC494AC datasheet(3/5 Pages) TI

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ELECTRICAL CHARACTERISTICS:

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNITS

Deadtime Control Section (cont.) (Output Control Connected to VREF)

Input Threshold Voltage (Pin 4)

Zero Duty-Cycle

3.3

Maximum Duty-Cycle

Amplifier Section

Input Offset Voltage

VO (PIN 3) = 2.5V

Input Offset Current

VO (PIN 3) =2.5V

250

Input Bias Current

VO (PIN 3) = 2.5V

-0.2

-1

µA

Common-Mode Input Voltage Range

VCC = 7V to 40V

.03 to

VCC -2

Open Loop Voltage Gain

∆VO = 3V, VO = 0.5V to 3.5 V

Unity Gain Bandwidth

800

kHz

Common-Mode Rejection Ratio

VCC = 40V, TA = 25

°C65

Output Sink Current (Pin 3)

VID = -15mV to -5V, V(PIN 3) = 0.7V

0.3

0.7

Output Source Current (Pin 3)

VID = 15mV to 5V, V(PIN 3) = 3.5V

-2

Output Section

Collector Off-State Current

VCE = 40V, VCC = 40V

100

µA

Emitter Off-State Current

VCC = VC = 40V, VE = 0

-100

µA

Collector - Emitter

Saturation Voltage

Common-Emitter

VE = 0, IC = 200mA

1.1

1.3

Emitter-Follower

VC = 15V, IE = -200mA

1.5

2.5

Output Control Input Current

VI = 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 (UC495A, See Function Table)

Input Current

V(PIN 13) = 0.4V, Q1 ACTIVE

-200

µA

V(PIN 13) = 2.4V, Q2 ACTIVE

300

µA

Deadband

500

Zener Diode Circuit (UC495A)

Breakdown Voltage

VCC = 45V, IZ = 2mA

Sink Current

V(PIN 15) = 1V

0.2

0.3

0.6

Total Device

Standby Supply Current

Pin 6 at VREF, All other inputs and

outputs open

VCC = 15V

VCC = 40V

Under Voltage Lockout

3.5

6.5

Hysteresis

300

Switching Characteristics (TA = 25

°C)

Output Voltage Rise Time

Common-Emitter Configuration

100

200

Output Voltage Fall Time

RL = 68

Ω, CL = 15pF

100

Output Voltage Rise Time

Emitter-Follower Configuration

100

200

Output Voltage Fall Time

RL = 68

Ω, 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 a measure of the statistical distribution about the mean as derived from the formula:

√nΣ(Xn−X)2

= 1

− 1

UC494A/AC

UC495A/AC

Unless otherwise stated, over recommended operating free-air temperature range,

VCC = 15V, f = 10kHz, TA = TJ.

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