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LX157XCDMT View Datasheet(PDF) - Microsemi Corporation

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LX157XCDMT Datasheet PDF : 12 Pages
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LX1570/1571
PRODUCT DATABOOK 1996/1997
PHASE MODULATED AC SYNCHRONOUS SECONDARY-SIDE CONTROLLER
PR E L I M I N A RY D ATA S H E E T
A B S O L U T E M A X I M U M R AT I N G S (Note 1)
Supply Voltage (V ) .................................................................................................... 40V
CC
Digital Inputs ....................................................................................................... -0.3 to 7V
Output Peak Current Source (500nS) ........................................................................... 1A
Output Peak Current Sink (500nS) ................................................................................ 1A
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal.
T H E R MAL DATA
M PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
DM PACKAGE:
95°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
Y PACKAGE:
165°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
130°C/W
Junction Temperature Calculation: T = T + (P x θ ).
J
A
D
JA
The θ numbers are guidelines for the thermal performance of the device/pc-board system.
JA
All of the above assume no ambient airflow.
PACKAGE PIN OUTS
S.S. 1
VFB
2
COMP 3
C.S. 4
8
CT
7
VCC
6 OUT DRV
5 GND
M & Y PACKAGE
(Top View)
S.S.
VFB
COMP
C.S.
1
8
CT
2
7
VCC
3
6
OUT DRV
4
5
GND
DM PACKAGE
(Top View)
2.5V
S.S. 1
VFB 2
COMP 3
C.S. 4
CT 8
Error Amp
LX1571 BLOCK DIAGRAM
0.25V
Minimum
Current Comp
PWM Latch
RQ
2R
C.S. Comp
S
1V
R
0.5V
Voltage Hiccup
Comp.
1.5V
Current Mode
Hiccup Comp
Voltage Mode Hiccup
CHG
CONTROL
QUICK
CHG
CONTROL
Timing / Duty Cycle
Control
DISCH
CONTROL
VALLEY
THRESHOLD
CONTROL
LATCH RESET
CONTROL
LATCH
SET CONTROL
2.5V
5V
2.5V
REF
Internal
Bias
6V
16V
6 OUT DRV
7 VCC
5 GND
QR
QS
Hiccup
Latch
2
Copyright © 1997
Rev. 0.9.3 1/97
 

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