TK11250CM Toko America, TK11250CM Datasheet - Page 19

• Manufacturer Part Number: TK11250CM
• Description: (TK112xxCM) Voltage Regulator
• Manufacturer: Toko America

Application Hint
On / Off Control
It is recommended to turn the regulator Off when the circuit
following the regulator is not operating. A design with little
electric power loss can be implemented. We recommend
the use of the on / off control of the regulator without using
a high side switch to provide an output from the regulator.
A highly accurate output voltage with low voltage drop is
obtained.
Because the control current is small, it is possible to control it directly by CMOS logic. The PULLDOWN resistance is built
into the control terminal (500 kW). The noise and ripple rejection characteristics depend on the capacitance on the NOISE
BYPASS teminal. The ripple rejection characteristic of the low frequency region improves by increasing the capacitance
of C
requirements. The IC will not be damaged if the capacitor value is increased. The switching speed of off / on changes
depending on the capacitance at the Noise Bypass terminal. The switching speed slows when the capacitance is large.
January 2002 TOKO, Inc.
N
V IN
. A standard value is C
R
On / Off Control
TK11250C
TK11233C
TK11220C
N
=0.068 mF. Increase C
APPLICATION INFORMATION
5 V
3.3 V
2.0 V
N
in a design with important output noise and ripple rejection
There is an overheating concern because the power loss
of the low voltage output (TK11220) IC is large.
If necessary, decrease the electric power loss by using
the resistor (R) as shown in the left chart.
When the thermal sensor works, a decrease of the output
voltage, oscillation, etc. are observed.
REG
On / Off
V SAT
TK112xxCM
Page 19