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CS8128 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS8128은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 CS8128 기능
기능 5V Linear Controller/Driver
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS8128 데이터시트, 핀배열, 회로
CS8128
5V Linear Controller/Driver
Description
Features
The CS8128 contains all the necessary
control circuitry to implement a 5V lin-
ear regulator. An external pass device is
used to produce superior performance
compared to conventional monolithic
regulators. The CS8128 with a TIP42
PNP transistor typically provides a
100mV dropout voltage at 500mA,
increasing to 350mV at 3A. Quiescent
current at 500mA is only 5mA.
Monolithic regulators cannot approach
these figures because their power tran-
sistors do not provide the high beta and
excellent saturation characteristics at
high currents. The CS8128 is compatible
with a wide variety of external transis-
tors, allowing flexibility for thermal,
space, and cost management.
The CS8128 includes thermal shutdown
and externally programmable current
limit and over-voltage shutdown, mak-
ing it suitable for use in automotive and
switching regulator post regulator appli-
cations. An optional external RC filter
added to the CS8128 supply lead pro-
vides EMC hardening in addition to the
on-chip EMC hardening. The SENSE
lead allows remote sensing of the output
voltage for improved regulation.
An active microprocessor RESET func-
tion is included on-chip with externally
programmable delay time. During
power-up, or after detection of any error
in the regulated output, the RESET lead
will remain in the low state for the dura-
tion of the delay. Types of errors include
short circuit, low input voltage, over-
voltage shutdown, thermal shutdown,
or others that cause the output to
become unregulated. This function is
independent of the input voltage and
will function correctly with an output
voltage as low as 1V. Hysteresis is
included in both the reset and delay
comparators for noise immunity and to
prevent oscillations. A latching dis-
charge circuit is used to discharge the
delay capacitor, even when triggered by
a relatively short fault condition. This
circuit improves upon the commonly
used SCR structure by providing
improved noise immunity and full
capacitor discharge (0.2V typ).
Block Diagram
Pwr Gnd
Ref Gnd
VIN
Delay
IC
Power
Gnd
IC
Reference
Gnd
PRE-
REGULATOR
Regulated Supply
for Circuit Bias
10µA
Delay
Current
Latching
Discharge
QS
R
-
+
Vdis
Over
Voltage
Shutdown
Thermal
Shutdown
Bandgap
Reference 1.25V
Error
Amp
-
+
-
Reset
Comparator
Delay
- Comparator
+
SHUTDOWN
VOUT
Sense
RESET
s Externally Set Delay for
Reset
s 60V Load Dump
Protection
s Internal Thermal
Overload Protection
s 3% Output Accuracy
s Active RESET
s Noise Immunity
s On Chip EMC Hardening
Protection Incorporated
s Externally Set Current
Limit
s Externally Set
Overvoltage Shutdown
Package Options
8L SO & 8L PDIP
VIN 1
Sense 2
Delay 3
RESET 4
8 VOUT
7 Pwr Gnd
6 SHUTDOWN
5 Ref Gnd
Rev. 2/5/99
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




CS8128 pdf, 반도체, 판매, 대치품
VOUT
VRTH
VRTL
VRH
RESET Circuit Waveform
RESET
(3)
VRL
Delay
VDTC
VDTD
VDH
(1)
(2)
TD
(2)
(1) = No Delay Capacitor
(2) = With Delay Capacitor
(3) = Max: RESET Voltage (1.0V)
VDIS
RESET Circuit Functional Description
The CS8128 RESET function is very precise, has hysteresis
on both the RESET and Delay comparators, a latching
Delay capacitor discharge circuit, and operation 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 Low Voltage Inhibit and
Reset Delay circuits (see Block Diagram).
Low Voltage Inhibit Circuit
This circuit monitors output voltage, and when output
voltage is below VRTL, causes the reset output transistor to
be in the ON (saturation) state. When the output voltage is
above VRTH, this circuit permits the reset output transistor
to go into the OFF state if allowed by the reset Delay cir-
cuit.
RESET Delay Circuit
This circuit provides a programmable (by external capaci-
tor) delay on the RESET output lead. The Delay lead pro-
vides source current to the external delay capacitor only
when the Low Voltage Inhibit circuit indicates that output
voltage is above VRTH. Otherwise, the Delay lead sinks
current to ground (used to discharge the Delay capacitor).
The discharge current is latched ON when the output volt-
age falls below VRTL. The Delay capacitor is fully dis-
charged anytime the output voltage falls out of regulation,
even for a short period of time. This feature ensures a con-
trolled RESET pulse is generated following the detection
of an error condition. The circuit allows the RESET out-
put transistor to go to the OFF (open) state only when the
voltage on the Delay lead is higher than VDTC.
4

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