參數(shù)資料
型號(hào)： TDA8380A
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 穩(wěn)壓器
英文描述： Control circuit for switched mode power supplies
中文描述： SWITCHING CONTROLLER, PDIP16
封裝： 0.300 INCH, PLASTIC, MO-001AE, SOT-38-1, DIP-16
文件頁(yè)數(shù)： 11/20頁(yè)
文件大小： 158K
代理商： TDA8380A
November 1993
11
Philips Semiconductors
Product specification
Control circuit for switched mode power supplies
TDA8380A
Slow-start circuit
A slow-start occurs:
At Switch-on of the SMPS
After a current trip as described in the section
Over-current protection
After a low or high V
CC
trip.
The capacitor at the SS input is discharged and the slow-start bistable is reset when the voltage at the SS input falls
below 0.5 V after which the circuit is ready for a slow-start. The dead time (during which the capacitor at the SS input is
being charged to the 1.4 V lower level of the sawtooth) before duty cycle regulation starts is minimal. The SS input can
also be used for D
max
setting by connecting a resistor to ground. The voltage across this resistor is then limited to
1/6
×
V
ref
×
R
12
/R
6
.
Output stages
The output stage consists of two NPN darlington transistors, their collector and emitter connected to separate pins (see
Fig.13). The top transistor is capable of sourcing a maximum of 0.75 A to the high-voltage transistor while the bottom
transistor can sink peak currents up to 2.5 A.
For low currents up to 10 mA, the saturation voltage of the sink darlington transistor is similar to that of a single transistor
(see Fig.11). During switching of this transistor dV/dt is internally limited to reduce interference.
Care should be taken with the external wiring of the output pins to avoid oscillation or interference due to parasitic
inductance and wire resistance.
During start-up a small current flows from V
CC
to E2 to precharge the series capacitor at the output (see Fig.13).
Fig.10 Current protection.
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