tk71741scl Toko Inc., tk71741scl Datasheet - Page 12

• Manufacturer Part Number: tk71741scl
• Description: Dropout Voltage Regulator
• Manufacturer: Toko Inc.

As shown in the figure below, several components are required to discharge the charge in the output side capacitor in a
typical regulator.
Because the external electrical discharge circuit is unnecessary with the TK717xxS, the application becomes very simple.
Turning the regulator off automatically discharges the charge of the output side capacitor.
The TK112xxB is a normal regulator.
The TK717xx is built with the automatic discharge circuit during off time.
The TK716xxS, AS is built with the output disconnect circuit.
As shown here:
TK717xxS
Page 12
On/Off Control
APPLICATION INFORMATION (CONT.)
On/Off CONTROL
CONTROL
V OUT
V IN
V IN
on
0
TK717xxS (TOKO REGULATOR)
Doesn’t need discharge circuit
off res pons e: CL = 2.2 µF
200
C N = 1000 pF
TIME (µS)
DISCHARGE CURRENT IN OFF MODE
400
V OUT
TK112xxB
TK716xxS, AS
I Load = 0mA
600
TK717xx
V OUT
DISCHARGE CIRCUIT
October 2001 TOKO, Inc.