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CS3972YT5 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS3972YT5은 전자 산업 및 응용 분야에서
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부품번호 CS3972YT5 기능
기능 1.25A High Efficiency Switching Regulator
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS3972YT5 데이터시트, 핀배열, 회로
CS403
5V, 750mA Linear Regulator
with RESET
Description
Features
The CS403 is a linear regulator spe-
cially designed as a post regulator.
The CS403 provides low noise, low
drift, and high accuracy to
improve the performance of a
switching power supply. It is ideal
for applications requiring a highly
efficient and accurate linear regu-
lator. The active RESET makes the
device particularly well suited to
supply microprocessor based sys-
tems. The PNP-NPN output stage
assures a low dropout voltage
without requiring excessive supply
current. Its features include low
dropout (1V typically) and low
supply drain (4mA typical with
IOUT = 500mA).
The CS403 design optimizes sup-
ply rejection by switching the
internal reference from the supply
input to the regulator output as
soon as the nominal output voltage
is reached.
s 5V ±5% Output Voltage
s Low Drift
s High Efficiency
s Short Circuit Protection
s Active Delayed Reset
s Noise Immunity on Reset
s 750mA Output Current
Absolute Maximum Ratings
Forward Input Voltage ..................................................................................18V
Operating Junction Temperature, TJ..............................................-40 to 150ûC
Storage Temperature........................................................................-55 to 150ûC
Lead Temperature Soldering
Wave Solder (through hole styles only)..........10 sec. max, 260¡C peak
Block Diagram
Package Options
VIN
Start
RESET
REF
TO VOUT
Output
Current
Limit
+
- Error Amp
Low Voltage
INHIBIT
Comparator
ICHARGE
SCR
Latch
-
Delay
+
Comparator
VCMP
VOUT
Delay
Gnd
5 Lead TO-220
Tab (Gnd)
1. VIN
2. RESET
3. Gnd
4. Delay
5. VOUT
1
Rev. 2/18/98
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




CS3972YT5 pdf, 반도체, 판매, 대치품
Circuit Description
The CS403 RESET function is very precise, has hysteresis
on both the RESET and Delay comparators, a latching
Delay capacitor discharge circuit, and operates down to
1V.
The RESET circuit output is an open collector type with
ON and OFF parameters as specified. The RESET output
NPN transistor is controlled by the two circuits described
(see Block Diagram).
Low Voltage Inhibit Circuit
This circuit monitors output voltage, and when output
voltage is below the specified minimum, causes the
RESET output transistor to be in the ON (saturation) state.
When the output voltage is above the specified level, this
circuit permits the RESET output transistor to go into the
OFF state if allowed by the reset Delay circuit.
Reset Delay Circuit
This circuit provides a programmable (external capacitor)
delay on the RESET output lead. The Delay lead provides
source current to the external delay capacitor only when
the Low Voltage Inhibit circuit indicates that output volt-
age is above VRT(ON). Otherwise, the Delay lead sinks cur-
rent to ground (used to discharge the Delay capacitor).
The discharge current is latched ON when the output volt-
age is below VRT(OFF), or when the voltage on the Delay
capacitor is above VDIS. In other words, the Delay capaci-
tor is fully discharged any time the output voltage falls
out of regulation, even for a short period of time. This fea-
ture ensures a controlled RESET pulse is generated follow-
ing detection of an error condition. The circuit allows
the RESET output transistor to go to the OFF (open) state
only when the voltage on the Delay lead is higher than
VDIS.
Test Circuit
C1*
100nF
100nF
Cd
VIN VOUT
CS403
Delay
RESET
Gnd
C2**
COUT =10mF to
100mF
C1* is required if the regulator is far from the power source filter.
C2** is required for stability
Application Notes
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 should be based on cost,
availability, size and temperature constraints. A tantalum
or aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR, can cause insta-
bility. The aluminum electrolytic capacitor is the least
expensive solution, but, if the circuit operates at low tem-
peratures (-25¡C to -40¡C), both the value and ESR of the
capacitor will vary considerably. The capacitor manufac-
turers data sheet usually provides this information.
The value for the output capacitor COUT shown in the test
and applications circuit should work for most applica-
tions, however it is not necessarily the optimized solution.
To determine an acceptable value for COUT for a particular
application, start with a tantalum capacitor of the recom-
mended value and work towards a less expensive alterna-
tive part.
Step 1: Place the completed circuit with a tantalum capac-
itor of the recommended value in an environmental cham-
ber at the lowest specified operating temperature and
monitor the outputs with an oscilloscope. A decade box
connected in series with the capacitor will simulate the
higher ESR of an aluminum capacitor. Leave the decade
box outside the chamber, the small resistance added by
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