MB3759-P Fujitsu Microelectronics, Inc., MB3759-P Datasheet - Page 17

• Manufacturer Part Number: MB3759-P
• Description: Pulse-width-modulation Control Circuit Push-pull/single-ended Output Mode
• Manufacturer: Fujitsu Microelectronics, Inc.

(2) Example that does not use a diode
The output current I
In this case, a current flows into the reference voltage source via R3 and R4 if V
of the reference voltage, design the circuit such that this does not exceed 200 µA.
I
O
=
V
R3
IO
V
V
R
IO
1
REF
S
O
R2
R1
[(
after current limiting is:
R1 + R2
R1
R
S
R1
R2
–
R
R4
S
I
R3 + R4
O
R4
I
O
V
GND
O
) V
GND
V
O
O
+
R3 + R4
R4
V
REF
V
– V
O
0
V
IO
O
0
V
O
] (R2
V
0
O
R1 R2
R1
R1)
V
>
IO
R3 R4
> 0
R4
O
I
L1
> V
REF
I
R1 R2
L1
. To maintain the stability
R1
V
IO
< 0
MB3759
I
R3 R4
O
R4
I
O
17