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參數(shù)資料
| 型號(hào)： | CA3277 |
| 廠商： | Intersil Corporation |
| 英文描述： | Dual 5V Regulator with Serial Data Buffer Interface for Microcontroller Applications(雙路5V穩(wěn)壓器（帶串行數(shù)據(jù)緩沖器接口）) |
| 中文描述： | 雙5V穩(wěn)壓器與串行數(shù)據(jù)緩沖器，用于微控制器應(yīng)用（雙路5V的穩(wěn)壓器接口（帶串行數(shù)據(jù)緩沖器接口）） |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 75K |
| 代理商： | CA3277 |
7-44
CA3277
Protection -
Both OUT1 and OUT2 PNP output pass tran-
sistors are protected with Over-Voltage Shutdown and Over-
Temperature Shutdown. Current Limiting for each output is
independent and is accomplished by limited drive current
from the pre-drivers (Q135 for OUT2) to the PNP output
pass transistor (Q136). Over-Voltage is sensed as a thresh-
old voltage level at the BATT input. Both output stages are
shutdown when the V
BATT
voltage level is typically greater
than 20.5V. When the Ignition voltage is high, the Over-Tem-
perature level is sensed as V
BE
changes and compared to
the bandgap reference voltage. When the chip temperature
exceeds 150
ο
C, both output stages are shutdown. When
Over-Voltage or Over-Temperature thresholds are exceeded,
the sensed states are ORd to switch OFF drive to the output
stages. The ENABLE control for OUT2 is added to the OR
control of the OUT2 drive circuit. The Low Voltage Shutdown
control is added to the OR control of the OUT1 drive circuit.
Low Voltage Shutdown occurs at approximately 3.5V as the
BATT supply input is ramped down, forcing cutoff of the PNP
output pass transistor. The external capacitor on OUT1
holds charge, with a long RC time constant delay to sustain
shutdown control in the microcontroller. The internal shunt
resistance at the OUT1 terminal is typically 148K
.
Under conditions of reverse battery or negative supply
voltages on the BATT input, current in the IC is primarily
reverse junction leakage. The design of the CA3277 is
configured to prevent high current if the power supply is
reversed. Exceptions to this are preventable. One example is
current through the DATA IN input line terminating resistor,
normally connected directly to the BATT supply line. This
provides a path for current conduction into the IC through an
internal diode junction. The current is limited by the external
resistor and may be as high as 100mA at -26V. Where
negative supply voltages are potentially a problem, the
resistive load from DATA IN to BATT can be in series with a
reverse voltage blocking diode, such as a 1N914. This input
diode-resistor circuit is shown in Figure 2 as the remote
interface and load to the Current Multiplier output.
Dissipation -
The CA3277 device dissipation is the com-
bined watts of input voltage times current less the external
watts of power supplied by the chip. For normal use, the
major contribution to on-chip dissipation is primarily the
BATT input dissipation. The Current Multiplier output has a
potential to add significant dissipation. The open collector
driver of the Current Multiplier Output, pin 9 may or may not
be in saturation when sinking current. Because it is a current
mirror output with a constant current drive, the voltage may
be increased on pin 9, with a significant increase in the
resulting dissipation. The chip dissipation is approximately
equal to:
P
D
≈
[(V
IN
I
IN
) + (V
COUT
I
COUT
) - 5(I
OUT1
+I
OUT2
)]
where I
IN
V
IN
is IGN IN and BATT input dissipation, assuming
V
BATT
= V
IGN IN
, and V
OUT1
~
V
OUT2
~
5V. This assumes
negligible dissipation for the Ignition Comparator, Data
Comparator and Reset outputs.
FIGURE 3. OUTPUT2 DRIVER AND ERROR AMPLIFIER WITH THE ENABLE CONTROL
0.87K
R29
OUT2
+5V
6.4K
6.4K
23
Q126
Q127
Q128
Q129
Q130
Q131
Q132
Q133
Q134
Q135
Q136
R31
R33
R32
ERROR
AMP
OUT2 PASS
TRANSISTOR
TO BATT
I
B
V
REF
OVER-VOLTAGE
SHUTDOWN
CURRENT
LIMITED DRIVE
15
Q121
Q122
Q124
Q125
ENABLE
SWITCH
V
REF
50
μ
A
7
EN INPUT
Q120
Q123
Q119
OVER-TEMPERATURE
SHUTDOWN
Q75
Q16
Q14
2K
R30
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CA3277E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA3277E WAF | 制造商:Harris Corporation 功能描述: |
| CA327AM | 制造商:Harris Corporation 功能描述: |
| CA327Q | 制造商:Harris Corporation 功能描述: |
| CA3280 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual, 9MHz, Operational Transconductance Amplifier (OTA) |
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