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參數(shù)資料
| 型號(hào)： | RP-21203F3-870 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSS20 |
| 封裝： | FP-20 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 335K |
| 代理商： | RP-21203F3-870 |
8
Data Device Corporation
www.ddc-web.com
RP-21200
Rev. C
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11 T12 T13
CONTROL INPUT
LOAD CURRENT
STATUS 2
STATUS 1
TRIP POINT
Note: *Voltage rise/fall time is specified for maximum rated current.
FIGURE 6. SOLID-STATE POWER CONTROLLER TIMING
TIME
DESCRIPTION
MINIMUM
UNIT
MAXIMUM
T1-T2
TURN-ON DELAY
s
350
T2-T3
VOLTAGE RISE TIME *
300
s
700
T1-T4
ms
7.5
T4-T5
STATUS 1 & STATUS 2 RISE AND FALL TIME
ns
50
T6-T7
TURN OFF DELAY
s
900
T7-T8
VOLTAGE FALL TIME *
300
s
700
T6-T9
STATUS 1 & STATUS 2 TURN OFF DELAY
ms
5.0
T10-T11
TRIP TIME AFTER TURN-ON
s
see Fig 5
T11-T12
VOLTAGE FALL TIME AFTER TRIP*
300
s
700
T11-T13
TRIP TURN-OFF STATUS 1 DELAY
ms
5.0
STATUS 1 & STATUS 2 TURN ON DELAY
SOLID-STATE POWER CONTROLLER TIMING AT 28 VDC
HIGH SIDE AND LOW SIDE SWITCHING
Most applications place the circuit breaker in the wire supplying
power to the load, not in the load return wire; this is the ‘High
Side Switch’ configuration. The RP-21200 series are designed
to be placed in either ‘High Side’ or ‘Low Side’ switch configura-
tions.
FIGURE 1 shows both configurations.
Additionally,
because the
STAR Series SSPCs have complete isolation
between the control and power sides, these SSPCs can be used
with either positive (as shown in FIGURE 1), or negative power.
To use these SSPCs with negative power, the configurations in
FIGURE 1 are swapped. That is, the configuration of FIGURE 1
showing ‘High Side Switch’ would be used for low side switching
for negative input power and the configuration in FIGURE 1
showing ‘Low Side Switch’ would be used for high side switching
for negative input power. For either high side or low side switch
configurations, the ‘ground’ symbol in FIGURE 1 would be
replaced with the negative power input, -28VDC for instance,
and the ‘+28VDC’ symbol would be replaced with ground.
SELECTION
All wires carrying current have both continuous and transient rat-
ings for maximum safe operating current. Continuous ratings are
usually expressed in Amps and are dependent on the size of the
wire as well as physical conditions around the wire such as
whether or not the wire is in a bundle. Transient ratings are
expressed as an I2t product, which is a constant. Sometimes,
transient ratings are expressed as a pulse of current for a spec-
ified duration. The I2t constant can be calculated from that data.
Both continuous and transient ratings depend on the allowable
temperature rise of the wire which is dependent upon the type of
insulation on the wire as well as overall system requirements.
Since the STAR Series main function, like a circuit breaker, is to
protect the wire and prevent fire damage, the SSPC must have
lower continuous and transient ratings than the wire’s ratings.
The user must verify that the SSPC’s trip curve falls below the
wire’s safe operating curve for all values of time. For the RP-
21200 series and continuous currents, this is simple. Just spec-
ify the SSPC’s rated current to be below the wire’s continuous
current rating by the required safety factor times 1.45. The 1.45
comes from the fact that the RP-21200 series is guaranteed to
trip at 145% of rated current. Since the RP-21200 series are
available in three programmable ranges, it’s easy to tailor the
STAR Series to the wire.
It’s even easier to select an RP-21200 series SSPC for transient
ratings. The
STAR Series I2t ratings are tailored to the continu-
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