m51996ap Renesas Electronics Corporation., m51996ap Datasheet - Page 24

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

M51996AP/AFP
4. Power supply circuit for easy start-up
REJ03D0836-0201 Rev.2.01 Nov 14, 2007
Page 24 of 35
When IC start to operate, the voltage of the C
third winding of main-transformer as the I
“unstable start-up” or “fall to start-up” may happen, as the charging interval of C
the charging does occur only the duration while the induced winding voltage is higher than the C
induced winding voltage is nearly equal to the “operation-stop voltage” of type M51996A.
It is recommended to use the 10 to 47 F for C
Figure 18 DC Source Circuit for Stable Start-up
M51996A
V
GND
CC
CC
of the IC increases abruptly. In case shown in figure 15 and 16, some
VCC
VCC1
begins to decrease till the C
, and about 5 times capacity bigger than C
CV
CC1
+
CV
R1
CC2
+
Main
transformer
third
winding
VCC
VCC
becomes to be charged from the
is very short duration; that is
VCC1
VCC
for C
voltage, if the
VCC2
.