NCP1308DR2G ON Semiconductor, NCP1308DR2G Datasheet - Page 13
NCP1308DR2G
Manufacturer Part Number
NCP1308DR2G
Description
IC CTRLR PWM CM UVLO HV 8SOIC
Manufacturer
ON Semiconductor
Datasheet
1.NCP1308DR2G.pdf
(16 pages)
Specifications of NCP1308DR2G
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
75kHz
Voltage - Supply
11 V ~ 20 V
Buck
No
Boost
No
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 125°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
75kHz
Output Current
500 mA
Mounting Style
SMD/SMT
Operating Supply Voltage
20 V
Fall Time
20 ns
Rise Time
40 ns
Synchronous Pin
No
Topology
Flyback
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Duty Cycle
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
NCP1308DR2G
NCP1308DR2GOSTR
NCP1308DR2GOSTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
NCP1308DR2G
Manufacturer:
ON
Quantity:
8 180
Part Number:
NCP1308DR2G
Manufacturer:
ON/安森美
Quantity:
20 000
Protecting Pin 8 Against Negative Spikes
negative voltages that could appear on its pins (Figure 23).
To avoid any adverse latchup of the IC, we strongly
recommend to insert a resistor in series with pin 8. This
series for safety) from the V
Figure 12 details this other option:
As any CMOS controller, NCP1308 is sensitive to
Another option consists in adding a diode (or two in
+
Figure 24. A diode will force the V
the same pace the bulk capacitor does, avoiding a
Cbulk
negative ringing on the HV pin.
1
2
3
4
8
7
6
5
Figure 23. A negative spike can occur at mains switch-off if the
CC
+
to the bulk capacitor.
CVCC
Vcc
quality coefficient of Cbulk-Lp is high enough.
1N4007
CC
to decrease at
or
Vbulk
1N4007
1N4007
http://onsemi.com
NCP1308
13
resistor prevents from adversely latching the controller in
case of negative spikes appearing on the bulk capacitor
during the power-off sequence. Please refer to the power
dissipation section of this data sheet to see how to calculate
this element.
Vbulk
< 0
Latch!