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CS5112 数据表(PDF) 1 Page - Cherry Semiconductor Corporation

部件名 CS5112
功能描述  1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE
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制造商  CHERRY [Cherry Semiconductor Corporation]
网页  http://www.cherrycorp.com/
标志 CHERRY - Cherry Semiconductor Corporation

CS5112 数据表(HTML) 1 Page - Cherry Semiconductor Corporation

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1
Features
s Linear Regulator
5V ± 2% @ 100mA
s Switching Regulator
1.4A Peak Internal
Switch
120kHz Maximum
Switching Frequency
5V to 26V Operating
Supply Range
s Smart Functions
Watchdog
s Protection
Overtemperature
Current Limit
ENABLE
RESET
Package Options
24 Lead SO Wide
(Internally Fused Leads)
1.4A Switching Regulator with 5V, 100mA Linear
Regulator with Watchdog, RESET and ENABLE
1
VREG
VLIN
IBIAS
Gnd
Gnd
Gnd
Gnd
RESET
CDelay
WDI
COSC
VIN
NC
NC
VSW
Gnd
Gnd
Gnd
Gnd
VFB1
VFB2
SELECT
COMP
ENABLE
CS5112
Description
Over
Temperature
VIN
Linear
Error Amplifier
1.25V
VREG
1.4A
VSW
COMP
VFB1
VFB2
SELECT
VLIN
IBIAS
CDELAY
RESET &
Watchdog Timer
Current
Limit
WDI
COSC
Base
Drive
RESET
Gnd
Bandgap
Reference
Oscillator
Multiplexer
-
COMP
Logic
Switcher Shutdown
Switcher
Error Amplifier
Current Sense Amplifier
ENABLE
Block Diagram
A
Company
¨
Rev. 4/22/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
The CS5112 is a dual output power sup-
ply integrated circuit. It contains a 5V
±2%, 100mA linear regulator, a watchdog
timer, a linear output voltage monitor to
provide a Power On Reset (POR) and a
1.4A current mode PWM switching reg-
ulator.
The 5V linear regulator is comprised of
an error amplifier, reference, and super-
visory functions. It has low internal sup-
ply current consumption and provides
1.2V (typical) dropout voltage at maxi-
mum load current.
The watchdog timer circuitry monitors
an input signal (WDI) from the micro-
processor. It responds to the falling
edge of this watchdog signal. If a correct
watchdog signal is not received within
the externally programmable time, a
reset signal is issued.
The externally programmable active
reset circuit operates correctly for an out-
put voltage (VLIN) as low as 1V. During
power up, or if the output voltage shifts
below the regulation limit,
tog-
gles low and remains low for the duration
of the delay after proper output voltage
regulation is restored. Additionally a reset
pulse is issued if the correct watchdog is
not received within the programmed
time. Reset pulses continue until the cor-
rect watchdog signal is received. The
reset pulse width and frequency, as well
as the Power On Reset delay, are set by
one external RC network.
The current mode PWM switching regu-
lator is comprised of an error amplifier
with selectable feedback inputs, a cur-
rent sense amplifier, an adjustable oscil-
lator, and a 1.4A output power switch
with anti-saturation control. The switch-
ing regulator can be configured in a
variety of topologies.
The CS5112 is load dump capable and
has protection circuitry which includes
current limit on the linear and switcher
outputs, and an overtemperature limiter.
RESET


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