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RC1585 の電気的特性と機能

RC1585のメーカーはFairchild Semiconductorです、この部品の機能は「5A Adjustable/Fixed Low Dropout Linear Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 RC1585
部品説明 5A Adjustable/Fixed Low Dropout Linear Regulator
メーカ Fairchild Semiconductor
ロゴ Fairchild Semiconductor ロゴ 




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RC1585 Datasheet, RC1585 PDF,ピン配置, 機能
www.fairchildsemi.com
RC1585
5A Adjustable/Fixed Low Dropout Linear Regulator
Features
• Fast transient response
• Low dropout voltage at up to 5A
• Load regulation: 0.05% typical
• Trimmed current limit
• On-chip thermal limiting
• Standard TO-220, TO-263, TO-263 center cut and TO-252
packages
Applications
• Pentium® class GTL+ bus supply
• Low voltage logic supply
• Post regulator for switching supply
Typical Applications
Description
The RC1585 and RC1585-1.5 are low dropout three-terminal
regulators with 5A output current capability. These devices
have been optimized for low voltage applications including
VTT bus termination, where transient response and mini-
mum input voltage are critical. The RC1585 is ideal for low
voltage microprocessor applications requiring a regulated
output from 1.5V to 3.6V with an input supply of 5V or less.
The RC1585-1.5 offers fixed 1.5V with 5A current capabili-
ties for GTL+ bus VTT termination.
Current limit is trimmed to ensure specified output current
and controlled short-circuit current. On-chip thermal limit-
ing provides protection against any combination of overload
and ambient temperature that would create excessive junc-
tion temperatures.
The RC1585 series regulators are available in the industry-
standard TO-220, TO-263, TO-263 center cut and TO-252
power packages.
VIN = 3.3V
10µF
+
RC1585
VIN VOUT
ADJ
124
1.5V at 5A
+
22µF
24.9
VIN = 3.3V
10µF
+
RC1585-1.5
VIN VOUT
GND
1.5V at 5A
+
22µF
65-1585-01a
Pentium is a registered trademark of Intel Corporation.
REV. 1.1.4 10/8/02

1 Page





RC1585 pdf, ピン配列
PRODUCT SPECIFICATION
RC1585
Electrical Characteristics
Tj = 25°C unless otherwise specified.
The denotes specifications which apply over the specified operating temperature range.
Parameter
Reference Voltage3
Output Voltage4
Line Regulation1, 2
Load Regulation1, 2, 3
Conditions
1.5V (VIN – VOUT) 5.75V,
10mA IOUT 5A
3V VIN 7V
10mA IOUT 5A
(VOUT + 1.5V) VIN 7V,
IOUT = 10mA
(VIN – VOUT) = 3V,
10mA IOUT 5A
Dropout Voltage
VREF = 1%, IOUT = 5A
Current Limit
(VIN – VOUT) = 2V
Adjust Pin Current3
Adjust Pin Current Change3 1.5V (VIN – VOUT) 5.75V,
10mA IOUT 5A
Minimum Load Current
1.5V (VIN – VOUT) 5.75V
Quiescent Current
VIN = 5V
Ripple Rejection
f = 120Hz, COUT = 22µF Tantalum,
(VIN – VOUT) = 3V, IOUT = 5A
Thermal Regulation
TA = 25°C, 30ms pulse
Temperature Stability
Long-Term Stability
TA = 125°C, 1000 hrs.
RMS Output Noise
(% of VOUT)
TA = 25°C, 10Hz f 10kHz
Thermal Resistance,
Junction to Case
TO-220
TO-263, TO-252
Thermal Shutdown
Min.
1.225
(-2%)
1.47
5.1
10
60
Typ.
1.250
1.5
0.005
0.05
1.150
5.5
35
0.2
4
72
0.004
0.5
0.03
0.003
3
3
150
Max
1.275
(+2%)
1.53
0.2
0.5
1.300
120
5
13
0.02
1.0
Units
V
V
%
%
V
A
µA
µA
mA
mA
dB
%/W
%
%
%
°C/W
°C/W
°C
Notes:
1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.
2. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is determined by
input/output differential and the output currrent. Guaranteed maximum output power will not be available over the full input/
output voltage range.
3. RC1585 only.
4. RC1585-1.5 only.
REV. 1.1.4 10/8/02
3


3Pages


RC1585 電子部品, 半導体
RC1585
PRODUCT SPECIFICATION
Applications Information
General
The RC1585 and RC1585-1.5 are three-terminal regulators
optimized for GTL+ VTT termination and logic applica-
tions. These devices are short-circuit protected and offer
thermal shutdown to turn off the regulator when the junction
temperature exceeds about 150°C. The RC1585 series pro-
vides low dropout voltage and fast transient response. Fre-
quency compensation uses capacitors with low ESR while
still maintaining stability. This is critical in addressing the
needs of low voltage high speed microprocessor buses like
GTL+.
Stability
The RC1585 series requires an output capacitor as a part of
the frequency compensation. It is recommended to use a
22µF solid tantalum or a 100 µF aluminum electrolytic on
the output to ensure stability. The frequency compensation of
these devices optimizes the frequency response with low
ESR capacitors. In general, it is suggested to use capacitors
with an ESR of <300m. It is also recommended to use
bypass capacitors such as a 22µF tantalum or a 100µF alumi-
num on the adjust pin of the RC1585 for low ripple and fast
transient response. When these bypassing capacitors are not
used at the adjust pin, larger values of output capacitors pro-
vide equally good results.
Protection Diodes
In normal operation, the RC1585 series does not require any
protection diodes. For the RC1585, internal resistors limit
internal current paths on the adjust pin. Therefore, even with
bypass capacitors on the adjust pin, no protection diode is
needed to ensure device safety under short-circuit condi-
tions.
A protection diode between the input and output pins is
usually not needed. An internal diode between the input and
the output pins on the RC1585 series can handle micro-
second surge currents of 50A to 100A. Even with large value
output capacitors it is difficult to obtain those values of surge
currents in normal operation. Only with large values of
output capacitance, such as 1000µF to 5000µF, and with the
input pin instantaneously shorted to ground can damage
occur. A crowbar circuit at the input can generate those
levels of current; a diode from output to input is then recom-
mended, as shown in Figure 10. Usually, normal power sup-
ply cycling or system “hot plugging and unplugging” will
not generate current large enough to do any damage.
The adjust pin can be driven on a transient basis ±7V with
respect to the output, without any device degradation. As
with any IC regulator, exceeding the maximum input-to-
output voltage differential causes the internal transistors to
break down and none of the protection circuitry is then
functional.
D1
1N4002
(OPTIONAL)
RC1585
VIN + IN OUT
C1 ADJ
10µF
+
CADJ
+
R1
VOUT
C2
22µF
R2
D1
1N4002
(OPTIONAL)
VIN +
C1
10µF
RC1585-1.5
IN OUT
GND
+ VOUT
C2
22µF
65-1585-12
Figure 10. Optional Protection
Ripple Rejection
In applications that require improved ripple rejection, a
bypass capacitor from the adjust pin of the RC1585 to
ground reduces the output ripple by the ratio of VOUT/1.25V.
The impedance of the adjust pin capacitor at the ripple fre-
quency should be less than the value of R1 (typically in the
range of 100to 120) in the feedback divider network in
Figure 10. Therefore, the value of the required adjust pin
capacitor is a function of the input ripple frequency. For
example, if R1 equals 100and the ripple frequency equals
120Hz, the adjust pin capacitor should be 22µF. At 10kHz,
only 0.22µF is needed.
Output Voltage
The RC1585 regulator develops a 1.25V reference voltage
between the output pin and the adjust pin (see Figure 11).
Placing a resistor R1 between these two terminals causes a
constant current to flow through R1 and down through R2 to
set the overall output voltage. Normally, this current is the
specified minimum load current of 10mA.
The current out of the adjust pin adds to the current from R1
and is typically 35µA. Its output voltage contribution is
small and only needs consideration when a very precise out-
put voltage setting is required.
6 REV. 1.1.4 10/8/02

6 Page



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共有リンク

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