M51995AFP#CF0J Renesas Electronics America, M51995AFP#CF0J Datasheet - Page 27

• 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
ON-OFF Circuit Section
Figure 17 shows the circuit diagram of ON-OFF circuit. The current flown into the ON-OFF terminal makes the Q4
“on” and the switching operation stop. On the other hand, the switching operation will recover as no current flown into
ON/OFF terminal makes Q4 “off”. As the constant current source connected to Q4 base terminal has such the
hysteresis characteristics of 20 µA at operation and 3 µA at stopping. So the unstable operation is not appeared even if
the ON/OFF terminal voltage signal varies slowly.
Figure 18 shows how to connect the ON/OFF terminal. The switching operation will stop by switch-off and operate by
switch-on.
Transistor or photo transistor can be replaced by this switch, of course. No resistor of 30 to 100 kΩ is connected and
ON/OFF terminal is directly connected to GND, when it is not necessary to use the ON/OFF operation.
Figure 19 shows the I
adequate voltage, when R1 shown in Application Example is selected properly.
REJ03D0835-0300 Rev.3.00 Jun 06, 2008
Page 25 of 40
CC
versus V
Figure 16 Equivalent Circuit Diagram of Voltage Detector
CC
characteristics in OFF state and V
1 S
Operate stop at Q4 ON
I: 3 µA at stopping
I: 20 µA at operating
3 k
Figure 17 ON/OFF Circuit
ON/OFF
6 S
500 Ω
OP
AMP
2 k
F/B
−
+
≈ 7.1 V
I
CC
Q1
Q2
Q3
2.5 V
will be kept at not so high or low but at the
DET
Q4