lm5035mhx National Semiconductor Corporation, lm5035mhx Datasheet - Page 24

• Manufacturer Part Number: lm5035mhx
• Description: Pwm Controller With Integrated Half-bridge And Syncfet Drivers
• Manufacturer: National Semiconductor Corporation

www.national.com
Application Circuit Example
reference, U3 and U5 respectively, provide voltage feedback
via opto-coupler U4. Synchronous rectifiers Q4, Q5, Q6 and
Q7 minimize rectification losses in the secondary. An auxil-
iary winding on transformer T1 provides power to the
LM5035 VCC pin when the output is in regulation. The input
(Continued)
24
voltage UVLO thresholds are )34V for increasing V
and )32V for decreasing V
down by driving the ON/OFF input (J2) below 1.25V with an
open-collector or open-drain circuit. An external synchroniz-
ing frequency can be applied through a 100pF capacitor to
the RT input (U1 pin 5). The regulator output is current
limited at )34A.
PWR
. The circuit can be shut
PWR
,