M51995AFP#CF0J Renesas Electronics America, M51995AFP#CF0J Datasheet - Page 24

• 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
Intermittent Action and Oscillation Control Section
When the internal current limiting circuit states to operate and also the VF level decreases to lower than the certain level
of some 3 V, the dead-time spreads and intermittent action and OSC control circuit (which is one of the timer-type-
protection circuit) starts to operate.
The intermittent action and OSC control circuit is the one to generate the control signal for oscillator and intermittent
action circuit.
Figure 11 shows the timing-chart of this circuit. When the output of intermittent action and oscillation control is at
“high” level, the waveform of oscillator depends on the VF terminal voltage and the intermittent action circuit begins to
operate.
REJ03D0835-0300 Rev.3.00 Jun 06, 2008
Page 22 of 40
Figure 11 Timing Chart of Intermittent and OSC Control Circuit
OSC waveform
of CF terminal
Current limit
signal
Output of current
limit latch
Output of
intermittent action and
OSC control circuit
OSC waveform
of CF terminal
Current limit
signal
Output of current
limit latch
Output of
intermittent action and
OSC control circuit
CLM+
M51995A
V
GND
OUT
Figure 10 How to Connect Current Limit Circuit
(a) In case of CLM+
C
R
NF
NF
+
R
CLM
(b) Without current limit signal
(a) With current limit signal
M51995A
CLM−
V
GND
OUT
(b) In case of CLM−
C
R
NF
+
NF
R
CLM
GND
GND
GND