lx1673 Microsemi Corporation, lx1673 Datasheet - Page 11

• Manufacturer Part Number: lx1673
• Description: High Frequency Pwm Regulator
• Manufacturer: Microsemi Corporation

Copyright © 2004
Rev 1.0, 3/18/2005
1. The minimum R
2. A resistor has been put in series with the gate of the LDO
3. To delay the turn on of the LDO controller output, a
limit sensing. If this resistor becomes shorted, it will do
permanent damage to the IC.
pass transistor to reduce the output noise level. The resistor
value can be changed to optimize the output transient
response versus output noise.
capacitor should be connected between the LDDIS pin and
the +5volts.
resistor, which keeps the LDO active until this pin is pulled
high. During the power up sequence the capacitor connected
to the LDDIS pin will keep the LDO off until this capacitor,
being charge by the 100K pull down resistor, goes through
the low input threshold level.
TM
The LDDIS input has a 100K pull down
SET
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
resistor value is 1k ohm for the current
A P P L I C A T I O N N O T E
Integrated Products Division
®
Microsemi
4.
C O N S I D E R A T I O N S
together and to VCC. Do not leave them floating. A floating VS
pin will result in operation resembling a hiccup condition.
. If current limit is not used connect the VS and VC pins
High Frequency PWM Regulator
P
RODUCTION
D
ATA
S
HEET
LX1673
Page 11