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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： | 9/12页 |
| 文件大小： | 185K |
| 代理商： | SSP-21116-010-B |
6
Data Device Corporation
www.ddc-web.com
SSP-21116
J-03/03-0
POWER ON RESET
When the 5 V bias 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 CON-
TROL 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 CONTROL 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 ter-
minals does not turn off the SSPC and reapplication 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
indicates 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.
3) Normal off condition. STATUS 1 indicates the load is not
drawing current; STATUS 2 indicates the Power MOSFET
switch is off.
"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 msec from
a 150 amp overload (1000% for 15 amp unit) with a wire induc-
tance of only 33 mH it would generate a spike of 500 volts. This
exceeds the voltage rating of the MOSFET's. In order to provide
protection
from
these
transients,
transient
voltage
suppressors should be used between the SSPC Slew Control
and the Power In and between the SSPC Slew Control and
Power Out terminals. The rating of the transient voltage sup-
pressors should be selected 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 sup-
pressor 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 30 times its rating (3,000%). 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% maximum
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 SSPC's, be careful to simulate actual
system conditions.
TABLE 5. STATUS CODES
STATE
OUTPUT STATUS 1
(SEE NOTE 2)
OUTPUT STATUS 2
(SEE NOTE 3)
POWER CONTROLLER AND LOAD STATUS
1
L
2
L
H
3
L
H
L
Load “off”; showing normal “off” condition.
4
L
H
SSPC failure or STATUS 2 shorted to bias supply.
5
H
L
SSPC failure or short to ground on STATUS 2 line.
6
H
L
H
Load is “ON”, showing normal “on” condition.
7
H
L
Load is “OFF”, showing “trip” (see note 1).
8
H
Normal power out with load <5% of rated SSPC current.
Notes:
1) Any trip condition per Figure 2.
2) STATUS 1 indicates a logic LOW when the load is > 15% of the rated SSPC current.
3) STATUS 2 indicates a logic HIGH when the Power MOSFET switch is on.
INPUT
CONTROL CMD
SSPC failure or short to ground.
Load “on”; showing SSPC failure.
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