MP6002 – MONOLITHIC FLYBACK/FORWARD DC-DC CONVERTER

MP6002 Rev. 1.0

www.MonolithicPower.com

14

12/4/2013

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Control Design

Generally, telecom power supplies require the

galvanic isolation between a relatively high

input voltage and low output voltages. The most

widely used devices to transfer signals across

the isolation boundary are pulse transformers

and optocouplers.

--

+

--

+

S

Tr

D

d

R6

R3

Rb

R4

R1

R2

R5

C1

TL431

--

+

Figure 7—Simplified Circuit of Isolated

Power Supply with Optocoupler Feedback

The MP6002 uses current mode control to

achieve easy compensation and fast transient

response. A type II compensation network

which has two poles and one zero is needed to

stabilize

the

system.

The

practical

compensation parameters are provided in the

EV6002DN datasheet.

Boost Controller Application

The MP6002 can be used as a boost controller

as shown in Figure 8.

MP6002

GND

COMP

FB

LINE

8

5

6

7

1

4

3

2

SW

RT

VCC

VIN

D1

200V/1A

180V

20mA

Figure 8—High Voltage LED Boost

Controller Circuit