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参数资料
| 型号： | SSP-21116-010-B |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, DMA16 |
| 封装： | DIP-16 |
| 文件页数： | 10/12页 |
| 文件大小： | 185K |
| 代理商： | SSP-21116-010-B |
7
Data Device Corporation
www.ddc-web.com
SSP-21116
J-03/03-0
4) The SSPC has failed or STATUS 2 has shorted to the bias
supply. STATUS 1 indicates the load is not drawing cur-
rent; STATUS 2 indicates the Power MOSFET is on; the
SSPC should be off.
The next four conditions show the control input has commanded
the SSPC to be on.
5) The SSPC has failed or there is a short to ground on the
STATUS 2 output. STATUS 1 indicates the load is drawing
current but STATUS 2 indicates the Power MOSFET
switch is off.
6) Normal on condition. STATUS 1 indicates the load is
drawing current and STATUS 2 indicates the Power MOS-
FET switch is on.
7) Tripped condition. STATUS 1 indicates the load is not
drawing current and STATUS 2 indicates the Power MOS-
FET switch is off. The SSPC can be turned back on by
cycling the input control to a logic low and then back to a
logic high. If the excessive load has not been removed,
the SSPC will trip again.
8) No load current. STATUS 1 indicates the load is not draw-
ing current; STATUS 2 indicates the Power MOSFET
switch is on.
LOADS
The SSP-21116 series can be used with any type of load: any
combination of inductive, resistive, and capacitive. In addition,
they can be used with dc motors and lamps.
Inductive loads require protecting the SSPC against voltage tran-
sients. See the section on Precautions above.
Capacitive loads require comparing the load inrush current to the
trip curve of FIGURE 2. The inrush current must be below the
minimum trip curve to avoid tripping on the inrush current.
Capacitive loads can present a discharge problem. The SSPC's
use Power MOSFET's as the switching element. The MOSFET's
contain a parasitic diode which will be forward biased if the
SSPC power output terminal is more positive than the power
input terminal. If the 270 Vdc source is turned off while a charge
is held on the capacitive load, this diode will turn on and dis-
charge the load through the generator. The SSPC can carry a
reverse current equal to its forward current rating; however, the
dissipation with reverse current is up to four times the forward
current dissipation for the same current. The user must ensure
that the maximum case temperature is not exceeded.
Incandescent lamps must be treated like capacitive loads for
inrush current. Since they do not store charge, they do not pre-
sent a discharge problem.
DC motors also must be treated like capacitive loads for inrush
current. If they continue rotating when power is removed, reverse
current is a possibility due to back EMF. Voltage transients must
also be considered when using dc motors as loads on SSPC's.
HEATSINKING
The SSP-21116 series are designed so that the junction tem-
perature can never exceed its maximum rating if the case tem-
perature is held to 125°C or less. Heatsinking is recommended
to keep the case temperature to 125°C when operating at high
ambient temperatures. The SSPC's may be operated at room
temperature without a heat sink. The maximum ambient temper-
ature, TA, for operation without a heat sink is 125 - Pd x θCA
(where Pd is the power dissipation from TABLE 4 and
θ
CA is the
thermal resistance from case-to-ambient from TABLE 3).
The same expression is used for finding the maximum ambient
temperature with a heat sink except
θ
CA is now the sum of the
thermal resistance from case-to-sink and from sink-to-ambient.
NO OFFSET VOLTAGE
The Power MOSFET used in the DDC SSPC's have no inherent
voltage offset. The voltage drop across the Power MOSFET is
CONTROL
LOW
SSPC failure, or STATUS 1 and STATUS 2 shorted to ground, or No Bias
SYSTEM STATUS
SSPC failure or STATUS 1 shorted to ground
SSPC failure or STATUS 2 shorted to ground
Load “OFF”, Normal Condition
LOW
STATUS 1
LOW
STATUS 2
SSPC failure or STATUS 2 shorted to ground
Load “ON”, Normal Condition
Load is “OFF”, Tripped
LOW
STATUS 1 indicates a logic LOW if > 15% of the rated current flowing.
STATUS 2 indicates a logic LOW if the SSPC is tripped due to overcurrent.
LOW
HIGH
Load is “‘ON”, Load < 0.5% Rated Current
TABLE 6. OPTIONAL STATUS TRUTH TABLE
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