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PDF CS8122YTVA5 Data sheet ( Hoja de datos )
| Número de pieza | CS8122YTVA5 | |
| Descripción | 2% 5V/ 750mA Low Dropout Linear Regulator with Delayed RESET | |
| Fabricantes | Cherry Semiconductor Corporation | |
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CS8122
2% 5V, 750mA Low Dropout Linear
Regulator with Delayed RESET
Description
The CS8122 is a precision 5V linear reg-
ulator capable of sourcing in excess of
750mA. The RESETÕs delay time is
externally programmed using a discrete
RC network. During power up, or when
the output goes out of regulation, the
RESET lead remains in the low state
for the duration of the delay. This func-
tion is independent of the input voltage
and will function correctly as long as
the output voltage remains at or above
1V. Hysteresis is included in the Delay
and the RESET comparators to
improve noise immunity. A latching
discharge circuit is used to discharge
the delay capacitor when it is triggered
by a brief fault condition.
The regulator is protected against a
variety of fault conditions: i.e. reverse
battery, overvoltage, short circuit and
thermal runaway conditions. The regu-
lator is protected against voltage tran-
sients ranging from -50V to +40V. Short
circuit current is limited to 1.2A (typ).
The CS8122 is an improved replacement
for the CS8126 and features a tighter tol-
erance on its output voltage (2% vs 4%).
The CS8122 is packaged in a 5 lead
TOÐ220 with copper tab. The copper tab
can be connected to a heat sink if
necessary.
Features
s 5V +/- 2% Regulated
Output
s Low Dropout Voltage
(0.6V @ 0.5A)
s 750mA Output Current
Capability
s Externally Programmed
RESET Delay
s Fault Protection
Reverse Battery
60V Load Dump
-50V Reverse Transient
Short Circuit
Thermal Shutdown
Block Diagram
Over Voltage
Shutdown
Delay
Gnd
Pre-
Regulator
Regulated Supply
for Circuit Bias
Bandgap
Reference
Charge
Current
Generator
Thermal
Shutdown
Latching Discharge
QS
R
-
+
VDISC
Error Amplifier
Anti-Saturation
and
Current Limit
Delay Comparator
+
-
VIN
VOUT
VOUTSENSE
RESET
Package Options
5 Lead TO-220
1 VIN
2 VOUT
3 Gnd
4 Delay
5 RESET
1
Rev. 2/5/99
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
1 A ¨ Company
1 page  
VOUT
VRT(ON)
VRT(OFF)
RESET Circuit Waveform
VRH
RESET
(3)
VRL
Delay
VDC(HI)
VDC(LO)
VDH
(1)
(2)
tDelay
(2)
(1) = No Delay Capacitor
(2) = With Delay Capacitor
(3) = Max: RESET Voltage (1.0V)
VDIS
Circuit Description
The CS8122 RESET function, 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
The Low Voltage Inhibit Circuit monitors output voltage,
and when output voltage is below the specified minimum,
causes the RESET output transistor to be in the ON (satu-
ration) state. When the output voltage is above the speci-
fied level, this circuit permits the RESET output transistor
to go into the OFF state if allowed by the RESET Delay cir-
cuit.
Reset Delay Circuit
The Reset Delay Circuit provides a programmable (by
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 indi-
cates that output voltage is above VRT(ON). Otherwise, the
Delay lead sinks current to ground (used to discharge the
delay capacitor). The discharge current is latched ON
when the output voltage is below VRT(OFF). The Delay
capacitor is fully discharged anytime the output voltage
falls out of regulation, even for a short period of time. This
feature ensures that a controlled RESET pulse is generated
following 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 VDC(HI).
CIN*
100nF
CDelay
0.1mF
Test Circuit
VIN VOUT
CS8122
Delay Gnd RESET
RRST
4.7kW
COUT**
10mF
*CIN required if regulator is far from power source filter.
**COUT required for stability.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet CS8122YTVA5.PDF ] | |
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