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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)： | 3/20頁 |
| 文件大小： | 335K |
| 代理商： | RP-21203F3-120 |
11
Data Device Corporation
www.ddc-web.com
RP-21200
Rev. C
designed to guarantee coordination. Note that coordination is guar-
anteed for a system that uses RP-21200 series, exclusively.
LOCKOUT
One of the concerns in using SSPCs instead of electromechanical
circuit breakers is maintenance safety. Electromechanical circuit
breakers give a visible indication that they are off allowing safe
maintenance of a system. The concern is that when using SSPCs,
there is no such visible indication that the SSPC is off and the pos-
sibility that a malfunctioning controller could leave on SSPCs which
should be off, thereby creating a safety hazard during maintenance.
To address this concern, the
STAR Series of SSPCs are
designed with a Lockout Input.
When the Lockout Input is
brought to a logic high, the SSPC will be off, regardless of what
is commanded on the Control Command input. In a system, the
Lockout Inputs of all of the SSPCs can be brought to a switch
which can give a visible indication that the SSPC is, in fact, in a
safe, off state. There should be no concern that the Lockout
Input must be brought to a logic high to guarantee the SSPC is
off; the logic high voltage should be the 5 Volt bias power. That
way, if the 5 Volt bias power is lost, although the Lockout Input is
no longer high, the SSPC will still be off since it cannot operate
without 5 Volt bias power and is always off when that occurs.
For additional safety, the Control Command has an internal pull-
down resistor and the Lockout Input has an internal pull-up resis-
tor (see FIGURE 2). If either input is left unconnected, the RP-
21200 series of SSPCs will default to the off state.
ADVANTAGES OF THE RP-21200 SERIES
The RP-21200 series use power MOSFET technology as the
switch. Power MOSFETs have many advantages over electro-
mechanical devices and over bipolar transistors used as switch-
es. Most important is the fact that, when the switch opens, there
is no arcing. Arcing wears out mechanical contacts since mate-
rial is transferred from one contact to the other. In some cases,
the very high temperatures caused by arcing can actually weld
the contacts together, in which case the electromechanical
device cannot open the circuit and the wire will overheat and fail,
possibly causing a fire. Arcing also causes high levels of EMI.
Bipolar transistors are not as rugged as power MOSFETs. They
exhibit ‘secondary breakdown’ which limits the current they can
handle at maximum voltage without failing. Power MOSFETs do
not exhibit secondary breakdown and are limited only by their
junction temperature rating. Bipolar transistors also exhibit an
offset due to their saturation voltage, VCE(sat). Power MOSFETs
appear as simple resistors and their voltage drop is simply pro-
portional to their operating current.
The STAR Series of SSPCs are superior to solid-state relays.
Most solid-state relays have no protection feature; they are sim-
ply switches. Some solid-state relays will protect against short
circuits but cannot protect against smaller overloads because
they have no I2t circuits.
Since the RP-21200 series of SSPCs have TTL/CMOS-compatible
inputs and outputs they are easy to interface to embedded micro-
processor control. This allows automatic load control and automatic
load shedding in emergency situations and allows for remote control.
Because the
STAR Series of SSPCs have tighter trip tolerances
than electromechanical circuit breakers, it’s not necessary to use
as large a wire with these SSPCs as with circuit breakers. This
can save considerable weight which is especially important in
airborne and space applications.
Isolation of the control circuit from the power circuit allows the
RP-21200 series to be used in high-side and low-side and neg-
ative as well as positive switching applications.
Isolation also
prevents faults in the power side from propagating into the con-
trol side thereby preventing damage to other system compo-
nents.
Isolation also eliminates ‘ground loop’ problems which
can result in false operation.
PARALLELING OF RP-21200 SERIES
While the
STAR Series takes advantage of the fact that power
MOSFETs can be easily paralleled, it is not recommended that
RP-21200 series SSPCs be paralleled to obtain higher current
PARAMETER
CONDITIONS
UNIT
VALUE
Input Offset Current
Iload = 50% rated current
% of Rated Current
2.0, max.
Gain
—
Volts per % of Rated Current
Vref/100, typ.
Gain Error
—
% of Output
2.0, max.
Linearity Error
—
% of Maximum Output
0.5, max.
Reference Voltage Input Current
—
mA
0.26, typ.; 2.0, max.
Positive Output Swing
Iload = 200% of Rated Current
V
VBIAS -0.5, min.
Negative Output Swing
Iload = 0
V
0.02, typ.; 0.05, max.
Output Resistance
—
Ohm
0.33, typ.; 0.46, max.
Slew Rate
Iload = 20% to 80% of Rated
Current Step
V/
s
0.24, typ.; 0.072, min.
Bandwidth
Iload = 80% of Rated Current
kHz
30.0, typ.; 15.0, min.
TABLE 7. OPTIONAL ANALOG CURRENT OUTPUT (SEE NOTES)
Reference Voltage Input Range (2)
—
V
4.0 to VBIAS max.
Notes:
1. All Typical values are at 25°C; all Minimum and Maximum values apply from -55°C to +100°C.
2. Must be supplied externally between 4.0V min. to VBIAS max.
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