MP6001 – MONOLITHIC FLYBACK/FORWARD DC-DC CONVERTER

INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE

MP6001 Rev. 0.91

www.MonolithicPower.com

7

4/5/2006

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2006 MPS. All Rights Reserved.

TM

Synchronize Programmable Oscillator

The MP6001 oscillating frequency is set by an

external resistor from the RT pin to ground. The

value of RT can be calculated from:

S

f

KHz

550

k

10

RT

×

Ω

=

The MP6001 can be synchronized to an

external clock pulse. The frequency of the clock

pulse must be higher than the internal oscillator

frequency. The clock pulse width should be

within 50ns to 150ns. The external clock can be

coupled to the RT pin with a 100pF capacitor

and a peak level greater than 3.5V.

Duty Cycle Limiting with Line Feed Forward

limit at 67.5% when the LINE pin voltage is

reduces. Maximum duty cycle can be calculated

by:

%

100

V

V

7

.

2

V

7

.

2

D

LINE

MAX

×

⎥

⎦

⎤

⎢

⎣

⎡

+

=

Limiting the duty cycle at high line voltage

protects against magnetic saturation and

minimizes

the

output

sensitivity

to

line

transients.

Auto-Restart

and an open loop condition occurs, the voltage

crosses the threshold voltage, the auto-restart

circuit turns off the power switch and puts the

turns off and the standby current discharges

cycles between the two threshold voltages 15

times, the auto-restart circuit is disabled and the

controller begins soft-start.