NCP1203D60R2 datasheet(12/15 Pages) ONSEMI

Numer części	NCP1203D60R2

Szczegółowy opis	PWM Current?묺ode Controller for Universal Off?묹ine Supplies Featuring Standby and Short Circuit Protection

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Producent	ONSEMI [ON Semiconductor]

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NCP1203

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Figure 21. A negative spike takes place on the Bulk capacitor at the switch−off sequence

Simple and inexpensive cures exist to prevent from

internal parasitic SCR activation. One of them consists in

inserting a resistor in series with the high−voltage pin to

keep the negative current to the lowest when the bulk

becomes negative (Figure 22). Please note that the negative

spike is clamped to –2 x Vf due to the diode bridge. Also, the

power dissipation of this resistor is extremely small since it

only heats up during the startup sequence.

Another option (Figure 23) consists in wiring a diode from

VCC to the bulk capacitor to force VCC to reach UVLOlow

sooner and thus stops the switching activity before the bulk

capacitor gets deeply discharged. For security reasons, two

diodes can be connected in series.

Figure 22. A simple resistor in series avoids any

latchup in the controller

CVCC

D3

1N4007

8

7

6

5

1

2

3

4

+

Cbulk

+

CVCC

Rbulk

> 4.7 k

8

7

6

5

1

2

3

4

+

Cbulk

+

Figure 23. or a diode forces VCC to reach

UVLOlow sooner

Podobny numer części - NCP1203D60R2

Producent	Numer części	Arkusz danych	Szczegółowy opis
ON Semiconductor	NCP1203D60R2	145Kb / 14P	PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit October, 2004??Rev. 4
	NCP1203D60R2G	145Kb / 14P	PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit October, 2004??Rev. 4
	NCP1203D60R2G	257Kb / 15P	PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit Protection April, 2015 ??Rev. 12

More results

Podobny opis - NCP1203D60R2

Producent	Numer części	Arkusz danych	Szczegółowy opis
ON Semiconductor	NCP1201	242Kb / 19P	PWM Current?묺ode Controller for Universal Off?묹ine Supplies Featuring Low Standby Power with Fault Protection Modes February, 2006 ??Rev. 4
	NCP1203	257Kb / 15P	PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit Protection April, 2015 ??Rev. 12
	NCP1203	374Kb / 15P	PWM Current--Mode Controller for Universal Off--Line Supplies Featuring Standby and Short Circuit Protection December, 2010-- Rev. 10
	NCP1203	145Kb / 14P	PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit October, 2004??Rev. 4
	NCP1200	225Kb / 16P	PWM Current?묺ode Controller for Low?뭁ower Universal Off?묹ine Supplies September, 2006 ??Rev. 15
	NCP1217	241Kb / 18P	Enhanced PWM Current?묺ode Controller for High?뭁ower Universal Off?묹ine Supplies September, 2005 ??Rev. 4
	NCP1200A	136Kb / 16P	PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power October, 2004??Rev. 5
	NCP1201	159Kb / 20P	PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power with Fault Protection Modes October, 2004 ??Rev. 3
	NCP1216P065	287Kb / 18P	PWM Current-Mode Controller for High-Power Universal Off-Line Supplies December, 2010 ??Rev. 13
	DAP011	827Kb / 24P	PWM Current−Mode Controller for High−Power Universal Off−Line Supplies November, 2005 - Rev. 2

More results

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