TDA8385 Datasheet, PDF (14/21 Pages) NXP Semiconductors – Control circuit for a Self-Oscillating Power Supply SOPS

Philips Semiconductors
Control circuit for a Self-Oscillating
Power Supply (SOPS)
Preliminary specification
TDA8385
SYMBOL
PARAMETER
CONDITIONS
MIN.
Slow-start
I₇/I₃
charge current ratio
V₇ = 0.5 V
0.22
I₇
quick discharge current
V₇ = 1 V
20
V₇ = 100 mV
50
V₇
clamping level
I₇ = 100 µA
2.8
V₅
threshold for switching output
V₄ = 0.5 V; V₁₃ = 0 V; 1.4 − V_os
(V_ss)
V₇ = 1 V; I₂ = 2 mA;
V₉ = 2 V
Output stage
V_2(sat)
saturation voltage
I₂ = 2 mA
−
I₂
source current
V₂ = 2 V
operating
4.8
initialization phase
−
V₂
open output voltage HIGH
I₂ = 5 mA
12
Current simulation
I₅/I₁₂
V₁₂
V_5(sat)
∆V
current ratio
simulation input voltage
saturation voltage
threshold for switching output;
voltage difference between pins 5
and 11; offset simulation voltage
(V_os)
V₅ = 1 V; I₁₂ = 0.5 mA 0.19
I₁₂ = 0.5 mA
−
V₁₅ = V₆ = 0 V;
−
I₅ = 1 mA
V₁₅ = V₆ = 0 V;
−
I₅ = 200 µA
V₄ = 0.5 V; V₁₃ = 0 V; 60
V₇ = V₉ = 3 V;
I₂ = 2 mA;
V₁₁ = 0.5 V
Demagnetization input
t_demLH
t_demHL
delay from pin 15 to pin 5
LOW-to-HIGH
delay from pin 15 to pin 5
HIGH-to-LOW
see Fig.15;
−
pin 6 not connected
see Fig.15
−
V₁₅
clamping level
I₁₅ = 10 mA
positive
−
negative
−
V₁₅
demagnetization threshold
90
voltage
C₁₅
input capacitance
−
I₁₅
input bias current
V₁₅ = 60 mV
−
TYP.
0.24
−
−
3.0
1.5 − V_os
−
5.3
−
−
0.2
−
−
−
100
−
−
−
−
115
−
−
MAX.
0.26
−
−
3.2
1.6 − V_os
300
6.3
50
−
0.21
1.1
300
200
140
500
1
1.2
−1
140
10
0.5
UNIT
mA
µA
V
V
mV
mA
µA
V
V
mV
mV
mV
ns
µs
V
V
mV
pF
µA
March 1994
15