MB3889 Fujitsu Microelectronics, Inc., MB3889 Datasheet - Page 17

• Manufacturer Part Number: MB3889
• Description: 2-channel Dc/dc Converter Ic With Overcurrent Protection Symmetrical-phase Type
• Manufacturer: Fujitsu Microelectronics, Inc.

SETTING THE OUTPUT VOLTAGE
SETTING THE TRIANGULAR OSCILLATION FREQUENCY
The triangular oscillation frequency is determined by the timing capacitor connected to the timing resistor (R
connected to the RT terminal (pin 5).
Triangular oscillation frequency: f
f
OSC
(kHz) : =
R1
R2
R
V
14100
O
T
(k )
( INE2)
(CS2)
INE1
CS1
OSC
15
13
1
3
< CH1, CH2 >
1.23 V
Error Amp
V
O
(V)
1.23
R2
(R1
R2)
MB3889
T
)
17