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| 型号： | IRAC5001-HS100A |
| 厂商： | International Rectifier |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL ORING DEMO BOARD/IR5001 |
| 标准包装： | 1 |
| 其它名称： | *IRAC5001-HS100A |
IRAC5001-HS100A ORing Demo Board
The board takes advantage of a unique feature that comes with the IR5001 IC to
assess the redundancy status of the system as well as the functionality of the
OR-ing mosfets as a group (OR-FET1 or OR-FET2). Referring to Figure 6, the
FETCHK feature enables the system designer to manually switch OFF the IC’s
Vout pin ( gate drive) by pressing a normally-open microswitch “FETCHK SW1/
2”. This switch link the +12V_aux thru R7 to the clamping zener Z1 (5.1V) in
order to provide a logic voltage of ~5V (with reference to the IC’s GND ( pin (7))
to FETCHK/OFF pin 3. The desired outcome if FETCHK is initiated (while the OR-
FET is ON) is to toggle OFF the output of the IC, which will turn-off the OR-FET.
This will result in an increase of Vsd of more than 0.3V and a comparator inside
will compare it to a 0.3V reference voltage. The internal comparator will turn-ON
an open-drain mosfet to pull down pin 4 (FETSHORT pin), providing a ground
path for the LED to light up.
SHORT CIRCUIT TEST
During a fault condition such as short circuit of one of the converter, a finite
amount of reverse current in the form of short duration negative current spike
will occur just before the OR-FET completely turn-off. The peak of this reverse
current is dependent on how fast the controller circuit switches off the OR-FETs
during this fault condition. The IR5001 IC is capable of sourcing and sinking
3A pk to fast turn - ON or OFF of the OR-FETs.
If short circuit occur at the secondary side of any power converter unit before
the Active OR-ing circuit, this faulty unit will be isolated by turning-off the OR-
FET(s) as quickly as possible, preventing the faulty unit from further drawing
any current from the other remaining good power converter(s) connected in the
system bus.
It is recommended to set the E-load to 65Amp and set the current limit of the
converters to ~120Amp before the evaluation of the reverse current during
short circuit test.
Caution : Use appropriate size of shorting wire ( larger than
#10 AWG with thick insulation) when performing short circuit
test. Shorting V1 or V2 should be done very quickly. It is
recommended to use a DC high current probe with amplifier
initially set to >50A/V to avoid overloading the probe or the
amplifier on the first test trial.
MODEL : IRAC5001-HS100A ORing DEMO BOARD
DOCUMENT Name : IRAC5001-HS100A_USERGUIDE_Rev1.3
Documented by : Israel Serrano, IR Singapore Design Center
DATE : 8/3/2004
PN : 1950-1003_Rev_1.3
Page 4 of 12
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105
http://www.irf.com / Data and specifications subject to change without notice.
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