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CS8120YN8 データシート(PDF) 5 Page - Cherry Semiconductor Corporation

部品番号 CS8120YN8
部品情報  5V, 300mA Linear Regulator with and ENABLE RESET
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メーカー  CHERRY [Cherry Semiconductor Corporation]
ホームページ  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS8120YN8 データシート(HTML) 5 Page - Cherry Semiconductor Corporation

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If the input voltage rises above 26V (e.g. load dump), the
output shuts down. This response protects the internal cir-
cuitry and enables the IC to survive unexpected voltage
transients.
Using an emitter sense scheme, the amount of current
through the NPN pass transistor is monitored. Feedback
circuitry insures that the output current never exceeds a
preset limit.
Should the junction temperature of the power device
exceed 180ûC (typ) the power transistor is turned off.
Thermal shutdown is an effective means to prevent die
overheating since the power transistor is the principle heat
source in the IC.
The CS8120 contains two microprocessor compatible con-
trol functions:
and
(Figure 3).
Function
switches the output transistor. When the voltage
on the
lead exceeds 2.9V typ, the output pass
transistor turns off, leaving a high impedance facing the
load. The IC will remain in Sleep mode, drawing only
250µA, until the voltage on the lead drops below 2.1V typ.
Hysteresis (800mV) is built into the
function to
Figure 3: Circuit Waveforms for CS8120
provide good noise immunity.
Function
A
signal (low voltage) is generated as the IC pow-
ers up (VOUT > VOUT - 100mV) or when VOUT drops out of
regulation (VOUT < VOUT - 140mV, typ). 40mV of hysteresis
is included in the function to minimize oscillations.
The
output is an open collector NPN transistor,
controlled by a low voltage detection circuit. The circuit is
functionally independent of the rest of the IC, thereby
Figure 4: RC Network for
Delay circuitry
guaranteeing that the
signal is valid for VOUT as low
as 1V.
An external RC network on the
lead (Figure 4) pro-
vides a sufficiently long delay for most microprocessor
based applications. RC values can be chosen using the fol-
lowing formula:
RTOT ´ CRST
where:
RTOT = RRST in parallel with RIN,
RIN = µP port impedance,
CRST =
delay capacitor,
tDelay = desired delay time,
VRST = VSAT of
lead
(0.7V @ turn - on), and
VT
= µP logic threshold voltage.
RESET
RESET
]
[
RESET
RESET
RESET
CRST
RRST
C2
22
mF
5V to
mP
and
System
Power
to
mP
RESET
Port
RESET
CS–8120
VOUT
RESET
RESET
RESET
(1) = NO RESET DELAY CAPACITOR
(2) = WITH RESET DELAY CAPACITOR
FOR 7V < VIN < 26V
VOUT
VRT(ON)
ENABLE
VRT(OFF)
(1)
(2)
VIN
VIN(HI)
H
HI
LO
VR PEAK
VR SAT
VR PEAK
RESET
ENABLE
ENABLE
ENABLE
ENABLE
RESET
ENABLE
Regulator Control Functions
5
ÐtDelay
ln
)
VT Ð VOUT
VRST Ð VOUT
(
Applications Notes
The circuit depicted in Figure 5 lets the microprocessor
control its power source, the CS8120 regulator. An I/O
port on the µP and the SWITCH port are used to drive the
base of Q1. When Q1 is driven into saturation, the voltage
on the
lead falls below its lower threshold. The
regulatorÕs output is switched out. When the drive cur-
rent is removed, the voltage on the
lead rises,
the output is switched off and the IC moves into Sleep
mode where it draws 250µA.
By coupling these two controls with
, the system
has added flexibility. Once the system is running, the
state of the SWITCH is irrelevant as long as the I/O port
continues to drive Q1. The µP can turn off its own power
by withdrawing drive current, once the SWITCH is open.
This software control at the I/O port allows the µP to fin-
ish key housekeeping functions before power is removed.
The logic options are summarized in Table 1 below
ENABLE
ENABLE
ENABLE
Circuit Description: continued
Table 1: Logic Control of CS8120 Output
µP I/O drive
SWITCH
Output
ON
Closed
LOW
ON
Open
LOW
ON
OFF
Closed
LOW
ON
Open
HIGH
OFF
ENABLE


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