NCP1395 データシートの表示（PDF） - ON Semiconductor

部品番号

コンポーネント説明

メーカー

NCP1395

High Performance Resonant Mode Controller

ON Semiconductor 

NCP1395A/B

1 vct 2 clock 5 difference

4.00

3.00

2.00

1

1.00

0

16.0

12.0

8.00

4.00

0

2

8.00

5

4.00

0

−4.00

−8.00

56.2u

65.9u

75.7u

time in seconds

Figure 44. Typical Oscillator Waveforms

85.4u

95.1u

Brown−Out Protection

The Brown−Out circuitry (BO) offers a way to protect the

resonant converter from low DC input voltages. Below a

given level, the controller blocks the output pulses, above

it, it authorizes them. The internal circuitry, depicted by

Figure 42, offers a possibility to observe the high−voltage

(HV) rail. A resistive divider made of Rupper and Rlower,

brings a portion of the HV rail on pin 7. Below the turn−on

level, a current source IBO is off. Therefore, the turn−on

level solely depends on the division ratio brought by the

resistive divider.

1 vin 2 vcmp

450 16.0

351 volts

Vbulk

Vdd

Rupper

IBO

ON/OFF

BO

+

BO

−

Rlower

+

VBO

Figure 45. The Internal Brown−Out

Configuration with an Offset Current Source

350 12.0

Vin

250 8.00

250 volts

150 4.00

50.0 0

20.0u

BO

60.0u

100u

time in seconds

140u

2

1

180u

Figure 46. Simulation Results for 350/250 ON/OFF Levels

http://onsemi.com

20

Share Link: