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P-TO220-7-180 View Datasheet(PDF) - Siemens AG

Part Name
Description
View to exact match
P-TO220-7-180
Siemens
Siemens AG Siemens
P-TO220-7-180 Datasheet PDF : 16 Pages
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TLE 4267
Design Notes for External Components
The input capacitor CI is necessary for compensation line influences. The resonant
circuit consisting of lead inductance and input capacitance can be damped by a resistor
of approx. 1 in series with CI. The output capacitor is necessary for the stability of the
regulating circuit. Stability is guaranteed at values of 22 µF and an ESR of 3 within
the operating temperature range.
Circuit Description
The control amplifier compares a reference voltage, which is kept highly accurate by
resistance adjustment, to a voltage that is proportional to the output voltage and drives
the base of the series transistor via a buffer. Saturation control as a function of the load
current prevents any over-saturating of the power element.
A comparator in the reset-generator block compares a reference that is independent of
the input voltage to the scaled-down output voltage. If this reaches a value of 4.5 V, the
reset-delay capacitor is discharged and then the reset output is set Low. As the output
voltage increases again, the reset-delay capacitor is charged with constant current from
VQ = 4.5 V onwards. When the capacitor voltage reaches the upper switching threshold,
reset goes High again. The reset delay can be set within wide range by selection of the
external capacitor.
With the integrated turn-ON/turn-OFF logic it is simple to implement delayed turn-OFF
without external components.
Truth Table for Turn-ON/Turn-OFF Logic
Pin 2
L
H
H
X
L
L
Pin 6
X
X
L
L
L
H
VQ
OFF
ON
ON
ON
ON
OFF
Remarks
Initial state, pin 6 internally pulled up
Regulator switched on via pin 2, by ignition for example
Pin 6 clamped active to ground by controller while pin 2 is still
high
Previous state remains, even ignition is shut off: self-holding
state
Ignition shut off while regulator is in self-holding state
Regulator shut down by releasing of pin 6 while pin 2 remains
Low, final state. No active clamping required by external self-
holding circuit (µC) to keep regulator shut off.
Pin 2: (Inhibit, E2) Enable function, active High
Pin 6: (Hold, E6) Hold and release function, active Low
Semiconductor Group
2
1998-11-01
 

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