7.5 Electrical Characteristics, Reference Section

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

PARAMETER

TEST CONDITIONS(1)

TL494C, TL494I

UNIT

MIN TYP(2)

MAX

Output voltage (REF)

IO = 1 mA

4.75

5

5.25

V

Input regulation

VCC = 7 V to 40 V

2

25

mV

Output regulation

IO = 1 mA to 10 mA

1

15

mV

Output voltage change with temperature

ΔTA = MIN to MAX

2

10

mV/V

Short-circuit output current(3)

REF = 0 V

25

mA

(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.

7.6 Electrical Characteristics, Oscillator Section

CT = 0.01 μF, RT = 12 kΩ (see Figure 8-1)

PARAMETER

TEST CONDITIONS(1)

TL494C, TL494I

UNIT

MIN TYP(2)

MAX

Frequency

10

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

1

Hz/kHz

Frequency change with temperature(4)

ΔTA = MIN to MAX

10

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:

(

)

N

2

n

n 1

x

X

N 1

=

-

s =

-

å

(4)

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

7.7 Electrical Characteristics, Error-Amplifier Section

See Figure 8-2

PARAMETER

TEST CONDITIONS

TL494C, TL494I

UNIT

MIN TYP(1)

MAX

Input offset voltage

VO (FEEDBACK) = 2.5 V

2

10

mV

Input offset current

VO (FEEDBACK) = 2.5 V

25

250

nA

Input bias current

VO (FEEDBACK) = 2.5 V

0.2

1

μA

Common-mode input voltage range

VCC = 7 V to 40 V

–0.3 to VCC – 2

V

Open-loop voltage amplification

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

70

95

dB

Unity-gain bandwidth

VO = 0.5 V to 3.5 V, RL = 2 kΩ

800

kHz

Common-mode rejection ratio

ΔVO = 40 V, TA = 25°C

65

80

dB

Output sink current (FEEDBACK)

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

0.3

0.7

mA

Output source current (FEEDBACK)

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

–2

mA

(1)

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

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TL494

SLVS074I – JANUARY 1983 – REVISED JULY 2022

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