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參數(shù)資料
| 型號： | RP-21203F3-120 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSS20 |
| 封裝： | FP-20 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大小： | 335K |
| 代理商： | RP-21203F3-120 |
12
Data Device Corporation
www.ddc-web.com
RP-21200
Rev. C
ratings unless severe derating or attention to matching is
observed.
Since the switches used in the
STAR Series are power MOSFETs
which, when on, look simply like resistors, if two SSPCs are
placed in parallel, the current will divide between them. If the ‘on’
resistances of the MOSFETs in both units are not identical, the
current will not divide equally. Therefore, they cannot trip at the
same point; the one with the lower ‘on’ resistance will carry a high-
er current and will trip first. As soon as the first SSPC trips, the
second SSPC will be carrying all of the current and it will trip. As
a result, the two SSPCs in parallel will not behave as one SSPC
with double the current rating. The current rating will be higher
than one SSPC alone, but it will be unpredictable.
Likewise, the trip curves vary from one SSPC to the next. Again,
this will result in one SSPC tripping before the other and an unpre-
dictable trip point. While the programmability feature of the
STAR
Series would allow the user to match the trip curves, this would not
necessarily guarantee matching over the full temperature range.
OPTIONAL CURRENT MONITOR
An optional Analog current monitor, used for reporting the load
current, can be special ordered from the factory. Monitor details
are shown in TABLE 7.
The optional Current Monitor provides a voltage output which is
proportional to the load current. This Current Monitor contains
an Analog-to-Digital converter, optical isolation and a Digital-to-
Analog converter. The Reference is brought out to a separate
pin. This Reference pin can be simply connected to the 5 Volt
bias pin. If the user attaches an external Analog-to-Digital con-
verter to the Current Monitor output pin, then the best accuracy
can be obtained by using the external converter’s reference for
the Current Monitor’s Reference.
Due to saturation characteristics of the output amplifier in the
Current Monitor, the Current Monitor output cannot swing all of
the way to ground or to the power supply (5 Volt bias). Therefore,
it cannot monitor very low currents (1% of Rated Current) nor
can it monitor very high currents (90%) when the 5 Volt bias is
used as the Reference. When a Reference voltage of 5 Volt bias
less 0.5 Volts is used, the Current Monitor can monitor currents
up to 100% of Rated Current; however, the lower limit remains.
OPTIONAL BATTLE SHORT
An optional Battle Short Control (Pin 5) is available on the RP-
21225X2/3 and RP-21209X2/3
STAR Series devices. The pin used
for this option is normally a no connect for all other versions of the
STAR Series. The Battle Short can be enabled by grounding the
Battle Short Control pin to Vbias supply common. To disable the
function the pin should be left floating or pulled high to Vbias.
OPTIONAL EVALUATION BOARD
An optional evaluation board is available and is outlined in FIG-
URE 7. Contact factory for ordering information.
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