m51996ap Renesas Electronics Corporation., m51996ap Datasheet - Page 23

• Manufacturer Part Number: m51996ap
• Description: Switching Regulator Control
• Manufacturer: Renesas Electronics Corporation.

M51996AP/AFP
3. Notice to the V
REJ03D0836-0201 Rev.2.01 Nov 14, 2007
Page 23 of 35
Figure 16 Start-up Circuit Diagram When It is Not Necessary to Set The Start and Stop Input Voltage
When the third winding is the “fly back winding” or “reverse polarity”, the V
V
To avoid the abnormal IC operation, it is recommended to design the V
voltage, which is induced from the stray capacity between the winding of main transformer.
To reduce the spike voltage, the C
frequency characteristics.
To design the conductor-pattern on PC board, following cautions must be considered as shown in figure 17.
(1) To separate the emitter line of type M51996A from the GND line of the IC
(2) The locate the C
(3) To separate the collector line of type M51996A from the V
(4) To connect the ground terminals of peripheral parts of ICs to GND of type M51996A as short as possible
IN(STOP)
Figure 17 How to Design The Conductor-pattern of Type M51996A on PC Board
can not be settled by this system, so the auxiliary circuit is required.
CC
, V
VCC
CC
line and GND line
as near as possible to type M51996A and connect directly
R
CLM
Rectified DC
voltage from
smoothing capacitor
Output
Collector
M51996A
VCC
Emitter
, which is connected between V
V
GND
M51996A
CC
(schematic example)
GND
V
CC
V
IN
R2
R1
+
C
CC
VCC
V
+
N
N
C
line of the IC
F
P
B
VCC
CC
Primary winding
of transformer
Third winding of
transformer
CC
and ground, must have the good high
is not vary abruptly and has few spike
IN(START)
Main
transformer
third winding
can be fixed, however,