HV301_05 Datasheet, PDF (1/20 Pages) Supertex, Inc – Hot Swap Controller (Negative Supply Rail)

Hot Swap Controller
(Negative Supply Rail)
HV301/HV311
HV301/HV311
Features
Ordering Information
❑ ±10V to ±90V Operation
❑ Built-in “normally on” turn-on clamp eliminates components
❑ UV/OV Lock Out & Power-on-Reset for Debouncing
Active State of ^{Package Options}
Power Good Signal
8 Pin SO
❑ Sense resistor program ground circuit breaker
❑ Programmable circuit breaker holdoff
❑ Inrush control using either: i) servo or ii) feedback cap
❑ Feedback to Ramp pin means no Gate clamp needed
❑ Application solution for input voltage step (diode “ORing”)
General Description ❑ Programmable Auto-Retry (tens of seconds if desired)
A_Npplic_oation_ts _Recommended ^{❑ Auto-RetryorLatchedOperation}
❑ Enable through Open Drain interface to UV or OV
❑ Low Power, <0.6mA PWRGD Flag Operation, <0.4mA
Sleep Mode
❑ Small SOIC-8 Package
Designs! ^{❑ -48VCentralOfficeSwitching}
❑ -24V Cellular and Fixed Wireless Systems
❑ -24V PBX Systems
❑ Line Cards
❑ -48V Powered Ethernet for VoIP
❑ Distributed Power Systems
❑ Power Supply Control
❑ +48V Storage Networks
Typical A_Fpplic_oation^rCirc^Nuit ^{ew ❑ Electronic Circuit Breaker}
HIGH
LOW
HV301LG
HV311LG
The Supertex HV301 and HV311 Hot Swap Controllers provide
control of power supply connection during insertion of cards or
modules into live backplanes. They may be used in systems
where active control is implemented in the negative lead of
supplies ranging from ±10V to ±90V.
During initial power application the gate of the external pass
device is clamped low to suppress contact bounce glitches by a
“normally on” circuit which does not require initialization of the
IC. Thereafter the UV/OV supervisors and power-on-reset work
together to suppress gate turn on until mechanical bounce has
ended. The HV301/311 then control the current inrush limit to a
programmed level using one of two possible methods, i) servo
control or ii) a drain to ramp capacitor. The above methods
eliminate the need for extra hold-off or current limiting compo-
nents. The devices also include an electronic circuit breaker,
programmed by a sense resistor.
After the load capacitance has fully charged, the HV301/311 will
transition into a low power mode, and enable the open drain
PWRGD. In low power mode the HV301/311 continues to moni-
tor the input voltage and monitor the current level. If a load fault
occurs, the electronic circuit breaker will trip, the pass
element will be turned off, and the PWRGD will return to an
GND
R1
487kΩ
R2
6.81kΩ
R3
9.76kΩ
8
VDD
3 _UV
2 _OV
PWRGD / PWRGD
1
HV301/
HV311
ENABLE / ENABLE
Cload
DC/DC
PWM
CONVERTER
+5V
COM
Waveforms
Drain
50V/div
(continued on Page 3)
VEE
4
SENSE
5
GATE
6
RAMP
7 C2
0.85nF
V_IN
50V/div
-48V
R4
12.5mΩ
C1
10nF
Q1
IRF530
-48V
NOTES: 1. Undervoltage Shutdown (UV) set to 35V.
2. Overvoltage Shutdown (OV) set to 65V.
3. Current Limit set to ~1A.
4. CB set to 8A.
Gate
5.00V/div
I_inrush
500mA/div
5.00ms/div
A092605
A092605
1