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PDF CS5210-1 Data sheet ( Hoja de datos )
| Número de pieza | CS5210-1 | |
| Descripción | 10A LDO 3-Pin Adjustable Linear Regulator | |
| Fabricantes | ON Semiconductor | |
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CS5210−1
10 A LDO 3−Pin Adjustable
Linear Regulator
The CS5210−1 linear regulator provides 10 A at adjustable voltages
from 1.25 V to 4.5 V. This adjustable device requires two external
resistors to set the output voltage and provide the minimum load
current for proper regulation.
This regulator is intended for use as a post regulator and
microprocessor supply. The fast loop response and low dropout
voltage make this regulator ideal for applications where low voltage
operation and good transient response are important.
The circuit is designed to operate with dropout voltages as low as
1.05 V at 10 A.
The regulator is protected against overload conditions with
overcurrent and thermal shutdown protection circuitry.
The regulator is available in a TO−220 package.
Features
• 1.25 V to 4.5 V VOUT at 10 A
• Dropout Voltage < 1.05 V @ 10 A
• 2.0% Trimmed Reference
• Fast Transient Response
• Thermal Shutdown
• Current Limit
• Short Circuit Protection
5.0 V
VIN VOUT
CS5210−1
Adj
100 μF
0.1 μF
3.3 V @ 10 A
124
Load
200
300 μF
Figure 1. Applications Diagram
http://onsemi.com
TO−220
THREE LEAD
T SUFFIX
CASE 221A
12 3
PIN CONNECTIONS AND
MARKING DIAGRAMS
CS5210−1
AWLYWW
Tab = VOUT
Pin 1. Ad-
just
2. VOUT
3. VIN
1
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
Device
Package
Shipping
CS5210−1GT3
TO−220* 50 Units/Rail
*TO−220 is 3−pin, straight leaded.
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 7
1
Publication Order Number:
CS5210−1/D
1 page  
CS5210−1
APPLICATION NOTES
THEORY OF OPERATION
The CS5210−1 linear regulator has a composite
PNP−NPN output stage that requires an output capacitor for
stability. A detailed procedure for selecting this capacitor is
included in the Stability Considerations section.
ADJUSTABLE OPERATION
Design Guidelines
This LDO adjustable regulator has an output voltage
range of 1.25 V to 4.5 V. An external resistor divider sets the
output voltage as shown in Figure 11. The regulator’s
voltage sensing error amplifier maintains a fixed 1.25 V
reference between the output pin and the adjust pin.
A resistor divider network R1 and R2 causes a fixed current
to flow to ground. This current creates a voltage across R2 that
adds to the 1.25 V across R1 and sets the overall output
voltage. The adjust pin current (typically 50 μA) also flows
through R2 and adds a small error that should be taken into
account if precise adjustment of VOUT is necessary. The
output voltage is set according to the formula:
VOUT + VREF
R1
)
R1
R2
)
R2
IAdj
The term IAdj × R2 represents the error added by the adjust
pin current.
R1 is chosen so that the minimum load current is at least
10 mA. R1 and R2 should be of the same composition for best
tracking over temperature. The divider resistors should be
placed as close to the IC as possible and connected to the
output with a seperate metal trace.
VIN VOUT
CS5210−1
Adj
R1
The CS5210−1 linear regulator has an absolute maximum
specification of 6.0 V for the voltage difference between VIN
and VOUT. However, the IC may be used to regulate voltages
in excess of 6.0 V. The main considerations in such a design
are power−up and short circuit capability.
In most applications, ramp−up of the power supply to VIN
is fairly slow, typically on the order of several tens of
milliseconds, while the regulator responds in less than one
microsecond. In this case, the linear regulator begins
charging the output capacitor as soon as the VIN to VOUT
differential is large enough that the pass transistor conducts
current. VOUT is essentially at ground, and VIN is on the
order of several hundred millivolts, so the pass transistor is
in dropout. As VIN increases, the pass transistor will remain
in dropout, and current is passed to the load until VOUT is in
regulation. Further increase in VIN brings the pass transistor
out of dropout. The result is that the output voltage follows
the power supply ramp−up, staying in dropout until the
regulation point is reached. In this manner, any output
voltage may be regulated. There is no theoretical limit to the
regulated voltage as long as the VIN to VOUT differential of
6.0 V is not exceeded.
However, the maximum ratings of the IC will be exceeded
in a short circuit condition. Short circuit conditions will result
in the immediate operation of the pass transistor outside of its
safe operating area. Over−voltage stresses will then cause
destruction of the pass transistor before overcurrent or
thermal shutdown circuitry can become active. Additional
circuitry may be required to clamp VIN to VOUT differential
to less than 6.0 V if failsafe operation is required. One
possible clamp circuit is illustrated in Figure 12; however, the
design of clamp circuitry must be done on an application by
application basis. Care must be taken to ensure the clamp
actually protects the design. Components used in the clamp
design must be able to withstand the short circuit conditions
indefinitely while protecting the IC.
R2 EXTERNAL SUPPLY
Figure 11.
While not required, a bypass capacitor connected between
the adjust pin and ground will improve transient response
and ripple rejection. A 0.1 μF tantalum capacitor is
recommended for “first cut” design. Value and type may be
varied to optimize performance vs price.
VIN VOUT
VAdj
Figure 12.
http://onsemi.com
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| PDF Descargar | [ Datasheet CS5210-1.PDF ] | |
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