TL494CD datasheet(4/19 Pages) TI

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Electrical Characteristics

Reference Section

Oscillator Section

Error-Amplifier Section

TL494

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005

over recommended operating free-air temperature range, VCC = 15 V, f = 10 kHz (unless otherwise noted)

TL494C, TL494I

PARAMETER

TEST CONDITIONS(1)

UNIT

MIN TYP(2)

MAX

Output voltage (REF)

IO = 1 mA

4.75

5.25

Input regulation

VCC = 7 V to 40 V

Output regulation

IO = 1 mA to 10 mA

Output voltage change with temperature

∆T

A = MIN to MAX

mV/V

Short-circuit output current(3)

REF = 0 V

(1)

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

(2)

All typical values, except for parameter changes with temperature, are at TA = 25°C.

(3)

Duration of short circuit should not exceed one second.

T = 0.01 µF, RT = 12 kΩ (see Figure 1)

TL494C, TL494I

PARAMETER

TEST CONDITIONS(1)

UNIT

MIN TYP(2)

MAX

Frequency

kHz

Standard deviation of frequency(3)

All values of VCC, CT, RT, and TA constant

100

Hz/kHz

Frequency change with voltage

VCC = 7 V to 40 V, TA = 25°C

Hz/kHz

Frequency change with temperature(4)

∆T

A = MIN to MAX

Hz/kHz

(1)

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

(2)

All typical values, except for parameter changes with temperature, are at TA = 25°C.

(3)

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

(4)

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

See Figure 2

TL494C, TL494I

PARAMETER

TEST CONDITIONS

UNIT

MIN TYP(1)

MAX

Input offset voltage

VO (FEEDBACK) = 2.5 V

Input offset current

VO (FEEDBACK) = 2.5 V

250

Input bias current

VO (FEEDBACK) = 2.5 V

0.2

µA

–0.3 to

Common-mode input voltage range

VCC = 7 V to 40 V

VCC – 2

Open-loop voltage amplification

∆V

O = 3 V, VO = 0.5 V to 3.5 V, RL = 2 kΩ

Unity-gain bandwidth

VO = 0.5 V to 3.5 V, RL = 2 kΩ

800

kHz

Common-mode rejection ratio

∆V

O = 40 V, TA = 25°C

Output sink current (FEEDBACK)

VID = –15 mV to –5 V, V (FEEDBACK) = 0.7 V

0.3

0.7

Output source current (FEEDBACK)

VID = 15 mV to 5 V, V (FEEDBACK) = 3.5 V

–2

(1)

All typical values, except for parameter changes with temperature, are at TA = 25°C.

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