TDA8385 datasheet(13/21 Pages) PHILIPS

13 / 21 page

March 1994

Philips Semiconductors

Preliminary speciﬁcation

Control circuit for a Self-Oscillating

Power Supply (SOPS)

TDA8385

CHARACTERISTICS

VP = 15 V; I3 = 200 µA; Tamb = 25 °C; unless otherwise speciﬁed.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

supply voltage (pin 16)

7.9

−

V16

supply initialization level

7.1

7.5

7.9

V16(hys)

internal ﬁxed hysteresis

2.5

−

2.55

I16

supply current

active LED output

−

V11

supply voltage ripple rejection

see Figs 13 and 14

−

Reference voltage

reference voltage at pin 3

0.52

0.55

0.58

Error ampliﬁer

threshold voltage error amplitude

2.4

2.5

2.6

input current feedback input

−

0.5

µA

I11

sink current output

V11 = 80 mV

400

−

µA

I11

source current output

V11 = 2.5 V

500

−

µA

open loop gain

−

100

−

unity gain bandwidth

−

600

−

kHz

∆V

9/∆T

temperature coefﬁcient

−

±300 × 10−6 −

K−1

threshold for switching output

Vdiff = 1.25 V;

V4 = 2 V; V13 = 0 V;

V7 > V9; I2 = 2 mA

−

Vdiff − Vos(1) −

Transfer characteristic generator

I4/I3

current ratio

V4 = 0.5 V

0.23

0.25

0.27

threshold for switching output

V4 = 0.5 V; V13 = 0 V;

V7 > V9; I2 = 2 mA

Ton(min)

V9 = 0 V

0.4

− V

0.5

− V

0.6

− V

Vfb = 20%

V9 = 0.4 V

−

0.9

− V

−

Vfb = 50%

V9 = 1 V

1.4

− V

1.5

− V

1.6

− V

Vfb = 80%

V9 = 1.6 V

−

2.1

− V

−

clamp

V9 = 2.25 V

2.4

− V

−

2.6

− V

tPLH

response time pulse width

modulation pin 5 to pin 2

LOW-to-HIGH

note 2

−

700

tPHL

response time pulse width

modulation pin 5 to pin 2

HIGH-to-LOW

note 2

−

µs

Feed forward

threshold for switching output

(Vfo)

V4 = 0.5 V; V13 = 0 V;

V7 = V9 = 3 V;

I2 = 2 mA; V11 = 1 V

0.6

− V

0.7

− V

0.8

− V

I13

input bias current

V13 = 0 V

−

µA

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