NCP1200AD100R2 ON Semiconductor, NCP1200AD100R2 Datasheet - Page 13

• Manufacturer Part Number: NCP1200AD100R2
• Description: IC CTRLR PWM CM HV 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1200AD100R2

• Output Isolation: Isolated
• Frequency Range: 90 ~ 114kHz
• Voltage - Input: 12.1 ~ 16 V
• Operating Temperature: 0°C ~ 150°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: NCP1200AD100ROSTR

in a solution using one 1N4007 (or two in a series for safety) forcing the V
capacitor does. Figure 24 shows the solution.
ensures a clean turn−off and the above problems go away.
depleting the V
A simple and inexpensive solution helps circumventing both problems, negative biasing, and gate high transient. It consists
When the bulk naturally depletes at power−off, the diode brings the V
Once implemented, please make sure that your operating waveforms match those of Figure 25. That is to say, a bulk level
1. Wire a diode between V
2. Select a MOSFET affected by a standard V
3. Check that final waveforms match Figure 25 signals
Figure 25. The Diode Addition Forces a Clean Turn−off Sequence both Negative Biasing
CC
capacitor at turn−off. To summarize:
CC
and the bulk capacitor as illustrated by Figure 24.
+
Cbulk
Figure 24. A Diode Forces the V
Quickly Discharge at Power−off
1
2
3
4
and Gate High State Troubles
NCP1200A
T
, minimum of 2 V, maximum of 4 V.
http://onsemi.com
8
7
6
5
13
Vbulk
Vgs
3
+
1N4007
CV
CC
CC
V
CC
CC
CC
Capacitor to
VFB
down as soon as Vbulk drops below V
or
capacitor to deplete at the same rate as the bulk
1N4007
1N4007
CC
. This