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TEA5170

SWITCH MODE POWER SUPPLY SECONDARY CIRCUIT

STMicroelectronics 

TEA5170

ELECTRICAL CHARACTERISTICS (TA = 25oC, VCC = 12V, unless otherwise specified)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

OSCILLATOR

TA

TB

∆FOSC

(T)

∆FOSC

(VCC)

Free Period

Frequency drift due to ambient

temperature variation from 0oC to 70oC

FOSC (70oC) − FOSC (0oC)

70oC x FOSC (25oC)

Frequency drift due to VCC variation

from 5V to 12V

FOSC (12V) − FOSC (5V)

7V x FOSC (12V)

RT = 100kΩ ± 0%

CT = 1.2nF ± 0%, Vcc = 12V

RT = 100kΩ ± 0%

CT = 560pF ± 0%, Vcc = 12V

RT = 100kΩ ± 0%

CT = 1.2nF ± 0%, Vcc = 12V

RT = 100kΩ ± 0%

CT = 1.2nF ± 0%

60.40 65.60 70.80 µS

29.18 31.70 34.22 µS

0.01

%/°C

0.07

%/V

ERROR VOLTAGE AMPLIFIER (VCC = 12V)

Ibias Input Bias Current

Gvol Voltage Gain

GB

Gain Bandwidth

Slew Rate

Ein = 2V

0 0.2 1 µA

80

dB

2

MHz

2

V/µs

INTERNAL VOLTAGE REFERENCE

VREF

Voltage Reference

∆VREF (VCC)

∆VREF (T)

Line

Regulation

VREF

(12V) −

7V

VREF (5V)

VREF drift with temperature

VREF (70oC) − VREF (0oC)

70oC

Using the voltage error

amplifier as a follower

VCC = 5V to 12V

TA = 0°C to 70°C

1.9 2 2.1 V

– 3 0.4

0.2

3 mV/V

mV/°

TON MIN

TONMIN A

Minimum Duty Cycle

TONMIN B Minimum Duty Cycle

Ct = 1.2nF ± 0%

Rt = 100kΩ ± 0%

Ct = 560pf ± 0%

Rt = 100kΩ ± 0%

1.77 2.53 3.29 µs

1.04 1.49 1.94 µs

POWER OUTPUT STAGE

VPOUTH

VPOUTL

ISINK

ISOURCE

Output High Level

Output Low Level

Sink Current

Source Current

SYNCHRONISATION

Iload = 1mA

Iload = – 1mA

VPOUT = 3V

VPOUT = 3V

6.3 6.9 7.5 V

0.5 0.8 1.1 V

30 60 190 mA

30 110 190 mA

Ftrig Max

Vtrig

Ttrigp

Wtrig +

Wtrig –

Maximum Synchro Frequency

Synchro Triggering Threshold

Synchro Triggering Pulse Width

Positive

Triggering

Window

Ttrig+ −

TO

TO

Negative

Triggering

Window

TO

− Ttrig−

TO

at VRT = 2.7Volt (fig 5)

CT = 1.2nF ± 0%

RT = 100kΩ ± 0%

CT = 1.2nF ± 0%

RT = 100kΩ ± 0%

64

2.7

800

kHz

3

V

nS

25 35 40 %

9 29 42 %

SOFT START

Icsf

*Csf Load Current

Donmax Maximum Duty Cycle

*Csf is a high impedance capacitor

Vcsf = 1V

Vcs > 2.5V, VCC = 12V

CT = 1.2nf ± 0%

RT = 100kΩ ± 0%

2.5 3.7 6 µA

60 78 95 %

3/9

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