M51995AFP#CF0J Renesas Electronics America, M51995AFP#CF0J Datasheet - Page 40

• Manufacturer Part Number: M51995AFP#CF0J
• Description: IC SWIT PWM SMPS OVP UVLO 20SOIC
• Manufacturer: Renesas Electronics America

Specifications of M51995AFP#CF0J

• Output Isolation: Isolated
• Frequency Range: 170 ~ 207kHz
• Voltage - Input: 9.9 ~ 36 V
• Power (watts): 1.5W
• Operating Temperature: -30°C ~ 85°C
• Package / Case: 20-SOIC (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

M51995AP/AFP
How to Get the Narrow Pulse Width During the Start of Operation
Figure 43 shows how to get the narrow pulse width during the start of the operation. If the pulse train of forcedly
narrowed pulse-width continues too long, the misstart of operation may happen, so it is recommended to make the
output pulse width narrow only for a few pulse at the start of operation. 0.1µF is recommended for the C.
How to Synchronize with External Circuit
Type M51995A has no function to synchronize with external circuit, however, there is some application circuit for
synchronization as shown in figure 44. If this circuit is used, the synchronization may be out of order at the overload
condition when the current limiting function starts to operate and VF terminal voltage becomes lower than 3 V.
REJ03D0835-0300 Rev.3.00 Jun 06, 2008
Page 38 of 40
Figure 43 How to Get the Narrow Pulse Width During the Start of Operation
Oscillating
waveform
Synchronize
waveform
Figure 44 How to Synchronize with External Circuit
R
ON
T-ON
Minimum pulse width of
synchronous pulse
C
F
M51995A
CF
R
M51995A
OFF
T-OFF
Q1
F/B
Maximum pulse width of
synchronous pulse
To photo
coupler
Q2
CT
+
C
T
120 µA
100 Ω
C
Synchronous
pulse
0 V
0 V