UC3845BD1G Просмотр технического описания (PDF) - ON Semiconductor

Номер в каталоге

Компоненты Описание

производитель

UC3845BD1G

High Performance Current Mode Controllers

ON Semiconductor 

UC3844B, UC3845B, UC2844B, UC2845B

VCC

Vin

5.0V Ref

+

-

7(12)

Isolation

Boundary

+

-

7(11)

T

S

Q

R

Comp/Latch

6(10)

5(8)

3(5)

R

VGS Waveforms

Q1

+

+

0

0

-

-

50% DC

25% DC

ǒ Ǔ V(Pin 1) - 1.4

Ipk =

3 RS

NS

Np

C

RS NS

NP

Figure 27. Isolated MOSFET Drive

8(14)

R

Bias

R

Osc

4(7)

+

1.0 mA 2R

2(3)

EA

R

1(1)

MCR

2N

101

3905

5(9)

2N

3903

The MCR101 SCR must be selected for a holding of < 0.5 mA @ TA(min). The

simple two transistor circuit can be used in place of the SCR as shown. All

resistors are 10 k.

Figure 28. Latched Shutdown

From VO

Ri

Rd Cf

2(3)

Rf

2.5V

+

1.0mA 2R

R

EA

1(1)

Rf ≥ 8.8k

5(9)

Error Amp compensation circuit for stabilizing any current mode topology except

for boost and flyback converters operating with continuous inductor current.

From VO

Rp Ri

Cp

Rd Cf

2.5V

2(3)

+

1.0mA 2R

Rf

EA

R

1(1)

5(9)

Error Amp compensation circuit for stabilizing current mode boost

and flyback topologies operating with continuous inductor current.

Figure 29. Error Amplifier Compensation

http://onsemi.com

12

Share Link: