TDA8385 Datasheet, PDF (15/21 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.
Delay setting
I₆/I₃
I₆
V₆
V_6(sat)
t_dLH
charge current ratio
V₆ = 1 V
1.1
charge current initialization phase V₆ = 1 V; V₁₆ = 5 V 2
clamping level
2.8
saturation voltage
delay from pin 6 to pin 2;
V₆ crossing the 2.5 V level;
LOW-to-HIGH
V₁₅ = 140 mV
−
C₆ = 470 pF;
−
V₅ = 0 V; I₂ = 2 mA;
V₁₅ see Fig.15;
excluding capacitive
tolerances
t/c
delay setting (t = C₆ × V/I)
V₆ = 2.5 V;
−
I₃ = 250 µA
Stand-by
V_10H
threshold level HIGH
2.4
V_10(hys) hysteresis
450
t_dLH
delay to output pin 10 to pin 2
−
LOW-to-HIGH
t_dHL
delay to output pin 10 to pin 2
−
HIGH-to-LOW
I₁₀
input current
V₁₀ = 2.3 V
−
Over voltage protection
V₈
threshold level
2.4
t_dLH
delay to output pin 8 to pin 2
−
LOW-to-HIGH
t_dHL
delay to output pin 8 to pin 2
−
HIGH-to-LOW
V₇
reset level
I₇/I₃
slow discharge current ratio
V₇ = 1 V
I₈
input current
V₈ = 3 V
90
0.12
−
Regulation indicator output
V₁
saturation voltage
I₁
leakage current
I₁ = 1 mA
−
V₁ = V₁₆
−
Notes
1. V_os = V_offset.
2. V₅ pulse = 1 V; V₄ = 0.5 V; V₉ = V₇ = 3 V; V₁₁ = 0.5 V; V₁₃ = 0 V; I₂ = 2 mA.
TYP.
1.2
−
−
50
−
10
2.5
500
−
−
−
2.5
−
−
−
0.23
−
−
−
MAX. UNIT
1.3
−
mA
3.2
V
100
mV
1.2
µs
−
ns/pF
2.6
V
550
mV
1
µs
1
µs
5
µA
2.6
V
1
µs
1
µs
140
mV
0.31
1
µA
300
mV
1
µA
March 1994
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