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CS5207-3GT3 데이터시트 PDF




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부품번호 CS5207-3GT3 기능
기능 7A Adjustable Linear Regulator
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS5207-3GT3 데이터시트, 핀배열, 회로
CS5207-1
7A Adjustable Linear Regulator
Description
The CS5207-1 linear regulator pro-
vides 7A at adjustable voltages
with an accuracy of ±1.5%. Two
external resistors are used to set the
output voltage within a 1.25V to
13V range.
The regulator is intended for use as
post regulator and microprocessor
supply. The fast loop response and
low dropout voltage make this reg-
ulator 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 1V
depending on the output current
level. The maximum quiescent cur-
rent is only 10mA at full load.
The regulator is fully protected
against overload conditions with
protection circuitry for Safe
Operating Area (SOA), overcurrent
and thermal shutdown.
The regulator is available in a
TO-220 package. A 3.3V, fixed ver-
sion is also available. Please consult
factory for more information.
Features
s Output Current to 7A
s Output Trimmed to ±1.5%
s Dropout Voltage
1.4V @ 7A
s Fast Transient Response
s Fault Protection Circuitry
Thermal Shutdown
Overcurrent Protection
Safe Area Protection
s 3.3V Fixed Version
Available
VIN
Rev. 7/8/97
Block Diagram
Package Options
VOUT
3L TO-220
Tab (VOUT)
Thermal
Shutdown
Bandgap
Output
Current
Limit
- + Error
Amplifier
Adj
1 Adj
2 VOUT
3 VIN
1
A 3.3V fixed version is also available.
*Consult factory.
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Web Site: www.cherry-semi.com
1 A ¨ Company




CS5207-3GT3 pdf, 반도체, 판매, 대치품
Applications Information
The CS5207-1 linear regulator provides adjustable volt-
ages at currents up to 7A. The regulator is protected
against short circuit, and include thermal shutdown and
safe area protection (SOA) circuitry. The SOA protection
circuitry decreases the maximum available output current
as the input-output differential voltage increases.
The CS5207-1 has a composite PNP-NPN output transistor
and requires an output capacitor for stability. A detailed
procedure for selecting this capacitor is included in the
Stability Considerations section.
Adjustable Operation
The adjustable regulator has an output voltage range of
1.25V to 13V. An external resistor divider sets the output
voltage as shown in Figure 1. The regulator maintains a
fixed 1.25V (typical) reference between the output pin and
the adjust pin.
A resistor divider network R1 and R2 causes a fixed cur-
rent to flow to ground. This current creates a voltage
across R2 that adds to the 1.25V across R1 and sets the
overall output voltage. The adjust pin current (typically
50µA) 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 + R2 + IAdj ´ R2
R1
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
10mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. The adjust pin is
bypassed to improve the transient response and ripple
rejection of the regulator.
tor with almost zero ESR, can cause instability. The alu-
minum electrolytic capacitor is the least expensive solu-
tion. However, when the circuit operates at low tempera-
tures, both the value and ESR of the capacitor will vary
considerably. The capacitor manufacturers data sheet pro-
vides this information.
A 22µF tantalum capacitor will work for most applications,
but with high current regulators such as the CS5207-1 the
transient response and stability improve with higher val-
ues of capacitor. The majority of applications for this regu-
lator involve large changes in load current so the output
capacitor must supply the instantaneous load current. The
ESR of the output capacitor causes an immediate drop in
output voltage given by:
ÆV = ÆI ´ ESR
For microprocessor applications it is customary to use an
output capacitor network consisting of several tantalum
and ceramic capacitors in parallel. This reduces the overall
ESR and reduces the instantaneous output voltage drop
under load transient conditions. The output capacitor net-
work should be as close as possible to the load for the best
results.
Protection Diodes
When large external capacitors are used with a linear regu-
lator it is sometimes necessary to add protection diodes. If
the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator.
The discharge current depends on the value of the capaci-
tor, the output voltage and the rate at which VIN drops. In
the CS5207-1 regulator, the discharge path is through a
large junction and protection diodes are not usually need-
ed. If the regulator is used with large values of output
capacitance and the input voltage is instantaneously short-
ed to ground, damage can occur. In this case, a diode con-
nected as shown in Figure 2 is recommended.
VIN
C1
VIN VOUT
CS5207-1
Adj
VREF
R1
IAdj
CAdj
R2
VOUT
C2
Figure 1. Resistor divider scheme for the adjustable version.
VIN
C1
IN4002 (optional)
VIN VOUT
CS5207-1
R1
Adj
VOUT
C2
CAdj
R2
Stability Considerations
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.
The capacitor value and type is based on cost, availability,
size and temperature constraints. A tantalum or aluminum
electrolytic capacitor is best, since a film or ceramic capaci-
Figure 2. Protection diode scheme for adjustable output regulator.
Output Voltage Sensing
Since the CS5207-1 is a three terminal regulator, it is not
possible to provide true remote load sensing. Load regula-
tion is limited by the resistance of the conductors connect-
ing the regulator to the load.
4

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관련 데이터시트

부품번호상세설명 및 기능제조사
CS5207-3GT3

7A Adjustable Linear Regulator

Cherry Semiconductor Corporation
Cherry Semiconductor Corporation
CS5207-3GT3

7A/ 3.3V Fixed Linear Regulator

Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

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