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参数资料
| 型号： | RP-21002D0-290S |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, DMA10 |
| 封装： | DIP-10 |
| 文件页数： | 9/12页 |
| 文件大小： | 135K |
| 代理商： | RP-21002D0-290S |
6
Data Device Corporation
www.ddc-web.com
RP-21000 Series
H-04/03-0
SELECTION
The selection of a proper sized SSPC is essential for protection
of the wire and load. This selection should be based on the
steady state and transient overload currents.
The shape of the trip curve (I2T) is selected as optimum to pro-
tect the system wiring. The power dissipated in the wire is the
wire resistance times the load current squared, and the temper-
ature of the wire is determined by the length of time that this
power is being dissipated. This makes the wire temperature pro-
portional to the current squared times the on time. Since the trip
curve follows this same characteristic the SSPC can accurately
predict the wire temperature rise as a result of overloads and
remove load current before the wiring is damaged from overtem-
perature. Of course, the wire I2T product should be greater than
the SSPC I2T product for the SSPC to protect the wire.
PRECAUTIONS
When a short-circuit causes turn off of the SSPC, precautions
have to be taken to limit the transient voltages generated by the
wire inductance. The magnitude of this voltage is L*di/dt, where
"L" is the wire inductance in Henries and "di/dt" is the rate of
change of output current. If the SSPC turns off in 10 sec from a
250 amp overload (1000% for 25 amp unit) with a wire induc-
tance of only 10 H, it would generate a spike of 125 volts. This
exceeds the voltage rating of the MOSFETs. In order to provide
protection from these transients, a transient voltage suppressor
should be used between the Power In terminal and Slew Control
(Power Ground) and a power diode should be used between the
Power Output terminals and Slew Control (Power Ground). (In
Low Side Switch Configuration, the power diode is not required).
The rating of the transient voltage suppressors should be select-
ed so that at the maximum expected short-circuit current, the
transient voltage suppressor voltage drop would not exceed the
SSPC voltage rating, and the power to be dissipated can be
safely absorbed without transient suppressor failure.
While circuit inductance can cause high voltage transients dur-
ing turn off, lack of circuit inductance can cause current tran-
sients prior to turn off. If the output of the SSPC is shorted and
there is no circuit inductance, the current from the source can
rise instantaneously to a high value. The SSPC will limit the cur-
rent to about 100 times its rating (10,000%). Circuit inductance
will limit the rate of rise of this current. The SSPC can take 25 s
to turn off. The current will always overshoot the 1200% maxi-
mum level of the SSPC due to this 25 s delay. If the current rises
slowly due to circuit inductance the overshoot will be negligible;
if the current rises quickly the overshoot will be more significant.
In any case, the current spike will be less than 25 s.
In most real applications there will always be significant circuit
inductance. The problem to guard against is voltage transients,
not current transients.
When testing individual SSPCs, be careful to simulate actual
system conditions.
POWER-ON RESET
When power is first applied the SSPC will be off regardless of the
CONTROL CMD input. If the CONTROL CMD input is a logic low
the SSPC is turned on by bringing the CONTROL CMD to a logic
high. If the CONTROL CMD input is at a logic high when power
is applied the SSPC may be turned on by cycling the CONTROL
CMD input to a logic low and then to a logic high. The system
controller can be programmed to do this cycling of the CON-
TROL CMD input. Subsequent loss of the bias supply power
causes the SSPC to turn off. Re-application of the bias supply
power again causes a power-on reset (refer to optional Power-on
reset.) Loss of power to the POWER IN terminals does not turn
off the SSPC and re-application of this power does not cause a
power-on reset.
STATUS CODES
This section contains a fuller explanation of the conditions and
meaning of the status codes shown in TABLE 5. Each paragraph
number corresponds to the STATE in TABLE 5.
The first four conditions show the control input has commanded
the SSPC to be off:
1) The SSPC has failed or shorted to ground. STATUS 1 indi-
cates the load is drawing current but the SSPC should be off.
2) The SSPC has failed. STATUS 1 indicates the load is
drawing current; STATUS 2 indicates the Power MOSFET
switch is on; the SSPC should be off.
Notes:
1) STATUS 1 indicates a logic low when the load is > 15% of rated SSPC current.
2) STATUS 2 indicates a logic high when the Power MOSFET switch is on.
3) Any trip condition per FIGURE 2.
Normal power out
with load < 5% of
rated SSPC current.
H
8
Load “off”; showing
“trip” (see note 3).
L
H
7
SSPC failure or
short to ground on
STATUS 2 line.
L
H
5
SSPC failure or STA-
TUS 2 shorted to
bias supply
H
L
4
Load “on”; showing
SSPC failure.
H
L
2
SSPC failure or
short to ground.
POWER
CONTROLLER AND
LOAD STATUS
Load “on”; showing
normal “on” condition.
Load “off”; showing
normal “off” condition.
L
H
L
H
3
6
L
OUTPUT
STATUS 2
(see note 2)
OUTPUT
STATUS 1
(see note 1)
L
INPUT
CONTROL
1
STATE
TABLE 5. STATUS CODES
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