CS5205-5GT3 Datasheet PDF - Cherry Semiconductor Corporation
| Part Number | CS5205-5GT3 | |
| Description | 5A Adjustable/ and 3.3V and 5V Fixed Linear Regulators | |
| Manufacturers | Cherry Semiconductor Corporation | |
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CS5205-1,-3,-5
5A Adjustable, and 3.3V
and 5V Fixed Linear Regulators
Description
Features
The CS5205-X series of linear regu-
lators provides 5A at adjustable
and fixed voltages with an accura-
cy of ±1% and ±2% respectively.
The adjustable version uses two
external resistors to set the output
voltage within a 1.25V to 13V
range.
The regulators are intended for use
as post regulators and microproces-
sor supplies. The fast loop response
and low dropout voltage make
these regulators ideal for applica-
tions 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 regulators are fully protected
against overload conditions with
protection circuitry for Safe
Operating Area (SOA), overcurrent
and thermal shutdown.
The CS5205-X is pin compatible
with the LT1084 family of linear
regulators but has lower dropout
voltage.
The regulators are available in TO-
220 and surface mount D2 packages.
s Output Current to 5A
s Output Trimmed to +/- 1%
s Dropout Voltage
1.2V @ 5A
s Fast Transient Response
s Fault Protection Circuitry
Thermal Shutdown
Overcurrent Protection
Safe Area Protection
CS5205-1
VIN
Block Diagram
VOUT
Thermal
Shutdown
Bandgap
Output
Current
Limit
- + Error
Amplifier
Adj
Package Options
3L TO-220
Tab (VOUT)
3L D2PAK
1
CS5205-3, -5
VIN
Thermal
Shutdown
Bandgap
Output
Current
Limit
- + Error
Amplifier
VOUT
Gnd
Rev. 6/12/97
1
1
CS5205-1
1 Adj
2 VOUT
3 VIN
CS5205-3, -5
1 Gnd
2 VOUT
3 VIN
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: [email protected]
Web Site: www.cherry-semi.com
A ¨ Company
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Applications Information: continued
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-
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 CS5205-X 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 network
should be as close as possible to the load for the best results.
VIN
C1
IN4002 (optional)
VIN VOUT
CS5205-X
Gnd
VOUT
C2
Figure 2b. Protection diode scheme for fixed output regulators.
Output Voltage Sensing
Since the CS5205-X 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. For best results the fixed reg-
ulators should be connected as shown in Figure 3.
VIN VIN
VOUT
conductor parasitic
RC resistance
CS5205-X
RLOAD
Gnd
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 CS5205-X family of linear regulators, the discharge
path is through a large junction and protection diodes are
not usually needed. If the regulator is used with large val-
ues of output capacitance and the input voltage is instanta-
neously shorted to ground, damage can occur. In this case,
a diode connected as shown in Figures 2a and 2b is recom-
mended.
Figure 3. Conductor parasitic resistance can be minimized with the
above grounding scheme for fixed output regulators.
For the adjustable regulator, the best load regulation
occurs when R1 is connected directly to the output pin of
the regulator as shown in Figure 4. If R1 is connected to the
load, RC is multiplied by the divider ratio and the effective
resistance between the regulator and the load becomes
( )RC ´ R1 + R2
R1
RC = conductor parasitic resistance
VIN
C1
IN4002 (optional)
VIN VOUT
CS5205-1
R1
Adj
VOUT
C2
VIN
VIN VOUT
CS5205-1
Adj
conductor parasitic
RC resistance
RLOAD
R1
R2
CAdj
R2
Figure 2a. Protection diode scheme for adjustable output regulator.
Figure 4. Grounding scheme for the adjustable output regulator to min-
imize parasitics.
5
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| Information | Total 7 Pages | |
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| Part Number | Description | MFRS |
| CS5205-5GT3 | The function is 5A Adjustable/ and 3.3V and 5V Fixed Linear Regulators. Cherry Semiconductor Corporation | |
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