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HV301 の電気的特性と機能

HV301のメーカーはSupertex Incです、この部品の機能は「Hotswap/ Controllers with Circuit Breaker」です。


製品の詳細 ( Datasheet PDF )

部品番号 HV301
部品説明 Hotswap/ Controllers with Circuit Breaker
メーカ Supertex Inc
ロゴ Supertex  Inc ロゴ 




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HV301 Datasheet, HV301 PDF,ピン配置, 機能
HV301HV301/HV311
HV311
Demo Kit
Available
Hotswap, Controllers with Circuit Breaker
(Negative Supply Rail)
Features
±10V to ±90V Operation
Built-in “normally on” turn-on clamp eliminates components
UV/OV Lock Out & Power-on-Reset(POR) for Debouncing
Sense resistor programmed 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”)
Programmable Auto-Retry (tens of seconds if desired)
Auto-Retry or Latched Operation
Enable through Open Drain interface to UV or OV
Low Power, <0.6mA , <0.4mA Sleep Mode
PWRGD Flag
Small SOIC-8 Package
Applications
-48V Central Office Switching
-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
Electronic Circuit Breaker
General Description
The Supertex HV301 and HV311 Hotswap 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
(continued on Page 21)
Typical Application Circuit
GND
R1
487k
R2
6.81k
R3
9.76k
8
VDD
3 UV
2 OV
PWRGD / PWRGD
1
HV301/
HV311
VEE
4
SENSE
5
GATE
6
RAMP
7 C2
-48V
R4
12.5m
C1
10nF
Q1
IRF530
-48V
ENABLE / ENABLE
Cload
DC/DC
PWM
CONVERTER
+5V
COM
0.75nF
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.
08/26/02
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex prod1ucts, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.

1 Page





HV301 pdf, ピン配列
General Description, cont’d.
inactive state. Thereafter a programmable auto-retry timer will
hold the device off to allow the pass element to cool before
resetting and restarting. The auto-retry can be disabled using a
single resistor if desired.
The HV301/HV311 includes a current mode servo-circuit which
can be used as a return to limit during input voltage steps such
as would be seen in a diode “ORed” situation when power
switches back to regulated supply from battery operation. The
HV301/HV311 allow independent programming of the trigger
level of this phenomenon so that it may be set at a different level
to the current limit level if desired. Under all circumstances the
maximum servo period is limited to 100ms to protect the pass
element.
PWRGD Logic
Model
HV301
HV311
Condition
INACTIVE (Not Ready)
ACTIVE (Ready)
INACTIVE (Not Ready)
ACTIVE (Ready)
PWRGD
0 VEE
1 HI Z
1 HI Z
0 VEE
Absolute Maximum Ratings
VEE reference to VDD pin
VPWRGD referenced to VEE Voltage
VUV and VOV referenced to VEE Voltage
Operating Ambient Temperature
Operating Junction Temperature
Storage Temperature Range
+0.3V to -100V
-0.3V to +100V
-0.3V to +12V
-40°C to +85°C
-40°C to +125°C
-65°C to +150°C
Waveforms
Drain
50V/div
VIN
50V/div
Gate
5.00V/div
Iinrush
500mA/div
5.00ms/div
Ordering Information
Active State of Package Options
Power Good Signal
8 Pin SO
HIGH
HV301LG
LOW
HV311LG
Pinout
HV301/HV311
PWRGD (HV301)
PWRGD (HV311) 1
OV 2
UV 3
VEE 4
8 VDD
7 RAMP
6 GATE
5 SENSE
Pin Description
PWRGD – The Power Good Output Pin is held inactive on initial
power application and will go active when the external MOSFET
is fully turned on. This pin may be used as an enable control
when connected directly to a PWM power module.
OV – This OverVoltage (OV) sense pin, when raised above its
high threshold will immediately cause the GATE pin to be pulled
low. The GATE pin will remain low until the voltage on this pin falls
below the low threshold limit, initiating a new start-up cycle.
UV – This UnderVoltage (UV) sense pin, when below its low
threshold limit will immediately cause the GATE pin to be pulled
low. The GATE pin will remain low until the voltage on this pin
rises above the high threshold limit, initiating a new start-up
cycle.
VEE – This pin is the negative terminal of the power supply input
to the circuit.
VDD This pin is the positive terminal of the power supply input
to the circuit.
RAMP – This pin provides a current output so that a timing ramp
voltage is generated when a capacitor is connected.
GATE – This is the Gate Driver Output for the external N-
Channel MOSFET.
SENSE – The current sense resistor connected from this pin to
VEE Pin programs the circuit breaker trip limit.
3


3Pages


HV301 電子部品, 半導体
Design Information, cont’d.
Undervoltage/Overvoltage Operation
GND
UVOFF
UVON
VIN
OVON
OVOFF
Pass ON
Transistor OFF
From the calculated resistor values the OV and UV start up
threshold voltages can be calculated as follows:
UVON
= VUVH
= 1.26 =
VEEUV(on)
×
R2 + R3
R1 + R2 + R3
OVON
= VOVL
= 1.16 =
VEEOV(on)
×
R3
R1 + R2 + R3
Where |VEEUV(on)| and |VEEOV(on)| are Under & Over Voltage Start
Up Threshold points relative to VEE.
Then
VEEUV(on)
= 1.26 ×
R1 + R2 + R3
R2 + R3
VEEUV(on)
= 1.26 ×
487k+ 6.81k+ 9.76k
6.81k+ 9.76k
= 38.29V
And
VEEOV(on)
= 1.16 ×
R1 + R2 + R3
R3
VEEOV(on)
= 1.16 ×
487k+ 6.81k+ 9.76k
9.76k
= 59.85V
Therefore, the circuit will start when the input supply voltage is
in the range of 38.29V to 59.85V.
Programming Inrush and ICB (Circuit Breaker)
Method 1: Inrush independent of ICB
VSENSE
10V
10µA
7.5µA
2.5µA
5k
7.5µA
C2
–+
0µA
+K–
GATE
RAMP
0µA
10n
Vgs +
Cgd
Cgs
dv on Cramp constant
df during limiting so no
current flowing into cap
inrush
Vin
+
Cload=100µF
gm(Vgs-Vt)
Rsense=12.5m
(DRAIN)
Cdb
VSENSE
10V
10µA
VSENSE
10µA
Isink
5k
RAMP
terminal
10n=Cramp
HV301/HV311
C2
0.75nF
1 : 2 mirror
Internal Circuitry
48V
Cload
GATE
Termial
Rsense
Vsense
1. Choose circuit breaker trip point eg. 8A as follows
Rsense = 100mV = 100mV = 12.5m
ICB 8
2. Choose inrush level, for example Inrush = 1A
3. Calculate Isink = Inrush *Rsense = 1A ×12.5m= 2.5µA
5k5k
4. Calculate C2 discharge limit
= 10µA -Isink = 7.5µA (typical) = iC2
4a. Adjust for Auto - retry disable, if used
Max Vt of a typical
Vtmax e.g. 4V = 1.6µA
Rdisable
2.5M
power FET
e.g. iC2 = 10µA -Isink -1.6µA
In this example we assume Auto - retry is enabled so
ignore 1.6µA, iC2 = 10µA -Isink = 7.5µA
5. Note: i = C dv
dt
iC2
=
C2
×
dv
dt
Inrush
=
Cload
×
dv
dt
Note VIN is fixed and VRAMP is constant during limiting
dv
dt
across Cload =
dv
dt
across C2
(as they share a
common node and their other terminals are fixed during inrush)
iC2 = Inrush Inrush = iC2 × Cload
C2 Cload
C2
by conservation of charge on RAMP Node iC2 = 7.5µA
Inrush =
7.5µA × Cload
C2
C2
=
7.5µA × Cload
Inrush
= 7.5µA ×100nF = 750pF = 0.75nF
1A
Note that RAMP is protected by AC divider and Gate
is clamped internally.
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