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參數(shù)資料
| 型號： | HV310 |
| 廠商： | Supertex, Inc. |
| 元件分類： | 脈沖抑制器 |
| 英文描述： | Hotswap, Inrush Current Limiter Controllers |
| 中文描述： | 熱插拔，浪涌電流限制器控制器 |
| 文件頁數(shù)： | 6/6頁 |
| 文件大?。?/td> | 78K |
| 代理商： | HV310 |
HV300/HV310
6
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 FAX: (408) 222-4895
www.supertex.com
08/26/02rev.10b
2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
Typical Application Circuit
Application Information
Under Voltage and Over Voltage Detection
The UV and OV pins are connected to comparators with nominal
1.21V thresholds and 100mV of hysteresis (1.21V
±
50mV).
They are used to detect under voltage and over voltage
conditions at the input to the circuit. Whenever the OV pin rises
above its threshold or the UV pin falls below its threshold the
GATE voltage is immediately pulled low, the PWRGD signal is
deactivated and the external capacitor connected to the RAMP
pin is discharged.
The under voltage and over voltage trip points can be
programmed by means of the three resistor divider formed by
R1, R2 and R3. Since the input currents on the UV and OV pins
are negligible the resistor values may be calculated as follows:
UV
off
= V
UVH
= 1.16 =
|
V
EEUV
|
* (R2+R3) / (R1+R2+R3)
OV
off
= V
OVL
= 1.26 =
|
V
EEOV
|
* R3 / (R1+R2+R3)
Where
|
V
EEUV
|
and
|
V
EEOV
|
are Under & Over Voltage Set
points.
If we select a divider current of 100
μ
A at a nominal operating
input voltage of 50 Volts then
(R1+R2+R3) = 50V / 100
μ
A = 500k
From the second equation for an Over voltage set point of 65
Volts the value of R3 may be calculated.
OV
off
= 1.26 = 65 * R3 / 500k
R3 = (1.26 * 500K) / 65 = 9.69 k
The closest 1% value is 9.76k
.
From the first equation for an Under Voltage set point of 35
Volts the value R2 can be calculated.
UV
off
= 1.16 = 35 * (R2 + R3) / 500K
R2 = (1.16 * 500K) / 35 – 9.76k
= 6.81k
.
The closest 1% value is 6.81k
.
Then R1 = 500K – (R2 +R3) = 483k
The closest 1% value is 487k
.
Current Limit
The current limit magnitude above which the current will not be
allowed to rise during startup is programmed using a sense
resistor connected from the SENSE pin to V
EE
pin. For example
to program a current limit of 1A, one would choose a resistor as
follows:
Rsense = 50mV / Isense
Rsense = 50mV / 1A
Rsense = 50m
Undervoltage/Overvoltage Operation
V
DD
UV
OV
V
EE
SENSE
GATE
RAMP
GND
-48V
R4
50m
R1
487k
R2
6.81k
R3
9.76k
Q1
IRF530
Cload
+5V
HV300LG or
HV310LG
8
3
2
COM
DC/DC
PWM
CONVERTER
1
GND
Jumper
Long
Pin
Long
Pin
Short
Pin
ENABLE
C1
10nF
PWRGD
NOTES: 1. Undervoltage Lockout (UV) set to 35V
2. Overvoltage Lockout (OV) set to 65V
3. Remove Jumper if Short Pin is used
7
4
5
6
GND
V
IN
Pass
Transistor
OFF
ON
UV
OFF
UV
ON
OV
OFF
OV
ON
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