HV9606 Supertex, Inc., HV9606 Datasheet - Page 9

• Manufacturer Part Number: HV9606
• Description: Switchmode PWM Controller
• Manufacturer: Supertex, Inc.

Application Information
Typical Board Mounted Power Synchronous Forward Converter
General Description,
It conforms to the requirements of IEEE 802.3 Powered Ethernet
and ETR-080 ISDN specifications.
The oscillator is programmable and provides fault tolerant peer-
to-peer synchronization to other similar circuits or master clock.
The chip draws almost no current (<6µA @ V
programmable START/STOP thresholds of the start-up regulator
are satisfied. It can also be powered via the V
the V
Other functions include leading edge current sense blanking,
programmable SOFT START, precision 1% band gap reference
and a SUPERVISOR CIRCUIT. The SUPERVISOR can provide
housekeeping functions such as µP supply monitoring and reset,
soft start inhibit for rapid restart on short duration input voltage
interruption. It also minimizes input and output capacitance
requirements.
+48V
GND
©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
IN
pin, in the range of 2.9V to 5.5V.
Optional Connection to SYNC Pin
of other HV9606 DC/DC Converters
or Master Clock
C1
R2
R1
C2
R3
C3
C5
R4
C4
48V to 3.3V @ 20A Isolated Synchronous Forward Converter
1
10
2
3
4
5
6
7
8
9
VDD
START
STOP
Vin
REF
SS
SYNC
RT
SGND
PGND
continued from Page 1
U1
R11
DD
IN
STATUS
SENSE
COMP
GATE
VX2
FB
CA
CB
CS
< 20V) until the
NI
pin, rather than
20
19
18
17
16
15
14
13
12
11
C8
1N4148
D1
MOC207
C7
U4
C6
R5
Ccp
M4
R13
R6
Q3
R7
1N4148
D4
9
G4
M1
R8
T1
Rccp
R10
R9
MOC207
To G4
M2 and M3
2 x Si4884DY
U3
Qccp
M4 and M5
2 x Si4884DY
R12
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: [phone] • FAX: [phone]
C9
OUT
LM3411
B320A
D2
U2
L1
(-) GND
(+) IN
1.23V
C10
www.supertex.com
-
C11
COMP
Rf
31K
03/05/02 rev.2
HV9606
To µP
RESET
Pin.
+
3.3V
@
20A