Regulator ICs
Switching regulator for electronic tuning
BA6161N / BA6161F
The BA6161N and BA6161F are switching regulators that contain a temperature compensation circuit. They can be used
for electronic tuning DC-DC converters.
FApplications
Electronic tuners in televisions and other electronic
equipment that requires high voltage (30X45V).
FFeatures
1) Output changes are small against input voltage vari-
ations.
2) Temperature compensation circuit provides stable
output.
FBlock
diagram
3) Reduced number of attached parts.
FPin
descriptions
261
Regulator ICs
FAbsolute
maximum ratings (Ta = 25_C)
BA6161N / BA6161F
FElectrical
characteristics (unless otherwise noted, Ta = 25_C and Vin = 9.0V)
FMeasurement
circuit
262
Regulator ICs
FCircuit
operation
A zener diode on the feedback pin provides reference
voltage and compensates for temperature changes.
Feedback current is fed from the zener diode to the oscil-
lator.
BA6161N / BA6161F
Blocking oscillation is provided by connecting the exter-
nal coil L between the oscillator drive pin and the V
IN
pin.
The potential at the oscillator drive pin can be raised by
using this oscillation. The output voltage is constant be-
cause the feedback current is always supplied to the os-
cillation circuit.
FApplication
example
FOperation
notes
(1) When an output voltage greater than the reference
output voltage (33.3V) is required, use a variable resistor
(Murata RVG6P02-104M or equivalent product) with
good temperature characteristics as shown in the ap-
plication circuit. Make sure, however, that the voltage of
the oscillator drive pin does not exceed 42V.
(2) The coil to be connected between pins 2 and 3
should have the lowest possible DC resistance (under
10Ω) and an inductance of 4.7mH (Sumida Electronics
RC095-472K or equivalent product).
263
Regulator ICs
FElectrical
characteristics curves
BA6161N / BA6161F
264
Regulator ICs
FExternal
dimensions (Units: mm)
BA6161N / BA6161F
265
