DC ELECTRICAL CHARACTERISTICS (continued

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Reference Voltage

µA

6.3

6.6

6.9

V

1

2

mV/V

µAto 30µA

1.5

2

mV/

µA

Internal Reference Voltage

4.26

4.40

4.54

V

Diode Fwd Voltage

2.2

3

V

Diode Fwd Voltage

2.2

3

V

Output Stage Open Loop Gain

f = 100Hz

60

dB

1.5

2.5

V

Pin 11 Scanning Voltage

1.7

3

V

Trigger Input Threshold

(see note 1)

2.6

3.0

3.4

V

Trigger Input Bias Current

30

µA

Trigger Input Width

(see note 2)

20

60

Th

µS

Notes : 1. The trigger input circuit can accept, with a metal option, positive and negative going input pulses.

2. Th

=

1.2

⋅ T

S

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Operating Supply Voltage Range

10

30

V

Peak-to-peak Operating Current Range

0.4

A

Supply Current

315

mA

Flyback Voltage

51

V

Sawtooth Pedestall Voltage

1.85

V

Junction Temp. for Thermal Shutdown

145

°C

RAMP

GENE RATO R

VOLTAGE

REGULATOR

FLYBACK

GENERATOR

THE RMAL

P ROTE C TION

2

3

6

8

10

BUF FER

S TAGE

11

CLOC K

P ULS E

P OWE R

AMP.

R3

1

79

4

TR IG-INP

47nF

180k

Ω

220k

Ω

0.1

µF

470

µF

1N4 001

100

µF

35V

2.2

Ω

0.22

µF

330

Ω

1.2k

Ω

1k

Ω

22

µF

1500

µF

1.2

Ω

2.4k

Ω

YOKE

Ry = 9.6

Ω

Ly = 24.6mH

Iy = 1.2App

TDA8174

APPLICATION CIRCUIT

TDA8174 - TDA8174W

3/5