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CS5111YDWFR24 데이터시트 PDF




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부품번호 CS5111YDWFR24 기능
기능 1.4A Switching Regulator with 5V/ 100mA Linear Regulator with Watchdog/ RESET and ENABLE
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CS5111YDWFR24 데이터시트, 핀배열, 회로
CS5111
1.4A Switching Regulator with 5V, 100mA Linear
Regulator with Watchdog, RESET and ENABLE
Description
Features
The CS5111 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, RESET 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 CS5111 is load dump capable and
has protection circuitry which includes
overvoltage shutdown, current limit on
the linear and switcher outputs, and an
overtemperature limiter.
Block Diagram
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
RESET
ENABLE
s Protection
Overvoltage
Overtemperature
Current Limit
s 54V Peak Transient
Capability
VFB1
VFB2
SELECT
COMP
IBIAS
COSC
VREG
CDELAY
WDI
Multiplexer
Oscillator
Switcher
Error Amplifier
-
COMP
Logic
Base
Drive
Current Sense Amplifier
-
Switcher Shutdown
1.4A
VIN
VSW
Gnd
ENABLE
Over Voltage
Bandgap
Reference
Linear
Error Amplifier
-
1.25V
Current
Limit
Over
Temperature
VLIN
RESET &
Watchdog Timer
RESET
Package Option
24 Lead SO Wide
(Internally Fused Leads)
VIN 1
NC
NC
VSW
Gnd
Gnd
ENABLE
VREG
VLIN
IBIAS
Gnd
Gnd
Gnd Gnd
Gnd Gnd
VFB1
VFB2
SELECT
RESET
CDelay
WDI
COMP
COSC
Rev. 12/28/98
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




CS5111YDWFR24 pdf, 반도체, 판매, 대치품
PACKAGE LEAD #
24 Lead SO Wide
1
2, 3
4
5,6,7,8,17,18,19,20
9
10
11
12
13
14
15
16
21
22
23
24
Package Lead Description
LEAD SYMBOL
FUNCTION
VIN
NC
VSW
Gnd
VFB1
VFB2
SELECT
COMP
COSC
WDI
CDelay
RESET
IBIAS
VLIN
VREG
ENABLE
Supply Voltage.
No connection.
Collector of NPN power switch for switching regulator section.
Connected to the heat removing leads.
Feedback input voltage 1 (referenced to 1.25V)
Feedback input voltage 2 (referenced to 1.25V)
Logic level input that selects either VFB1 or VFB2. An open selects
VFB2. Connect to Gnd to select VFB1.
Output of the transconductance error amplifier.
A capacitor connected to Gnd sets the switching frequency.
Refer to Figure 1d.
Watchdog input. Active on falling edge.
A capacitor connected to Gnd sets the Power On Reset and
Watchdog time.
RESET output. Active low if VLIN is below the regulation limit.
If watchdog timeout is reached, a reset pulse train is issued.
A resistor connected to Gnd sets internal bias currents as well as
the COSC and CDelay charge currents.
Regulated 5V output from the linear regulator section.
Input voltage to the linear regulator and the internal supply cir-
cuitry.
Logic level input to shut down the switching regulator.
Typical Performance Characteristics
4.5mA
0A
4.0mA
-10mA
-20mA
3.5mA
0A
20mA 40mA
60mA 80mA
ILIN
Figure 1a. 5V Regulator Bias Current vs. Load Current.
100mA
1.4V
1.2V
1.0V
0.8V
0.6V
0.4V
0.2V
0.0V
0A
0.5A
1.0A
ISW
Figure 1c. Switch Saturation Voltage.
1.5A
2.0A
-30mA
-40mA
0A 0.5A
1.0A
ISW
1.5A
Figure 1b. Supply Current vs. Switch Current.
2.0A
180
160
140
120
100
80
60
40
20
0
0
500 1000 1500 2000 2500 3000
COSC (pF)
Figure 1d. Oscillator Frequency (kHz) vs. COSC (pF), assuming RBIAS =
64.9k.
4

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CS5111YDWFR24 전자부품, 판매, 대치품
Circuit Description: continued
VIN
VLIN
IBIAS
RBIAS
64.9k
COSC
Oscillator
VREG
Over Voltage
COMP
COMP
Logic
Base Drive
VSW
1.4A
VOUT
COUT
Current Sense Amplifier
-
ENABLE
-
Switcher Shutdown
1.25V
RS
Gnd
Bandgap
Reference
Switcher
Error
Amplifier
-
Multiplexer
VFB1
VFB2
SELECT
R1
R2
R3
Figure 6: Block diagram of the 1.4A current mode control switching regulator portion of the CS5111 in a boost configuration.
Application Notes
Design Procedure for Boost Topology
This section outlines a procedure for designing a boost switch-
ing power supply operating in the discontinuous mode.
Step 1
Determine the output power required by the load.
POUT = IOUTVOUT
(1)
Step 2
Choose COSC based on the target oscillator frequency with an
external resistor value, RBIAS = 64.9k. (See Figure 1d).
VSW
VOUT
Step 3
Next select the output voltage feedback sense resistor
divider as follows (Figure 8).
For VFB1 active, choose a value for R1 and then solve for
REQ where:
REQ =
R1
VOUT
VFB1
-1
.
For VFB2 active, find:
(3a)
( )VFB1 = VOUT
REQ
R1 + REQ
, (3b)
VOUT
{REQ
VR2
R1
VFB1
R2
VFB2
R3
VIN
VSAT
0
ISW
IPeak
and then calculate R2 where:
Figure 8. Feedback sense
resistor divider connected
between VOUT and ground.
t
R2 =
VR2
IR2
=
VFB1 - VFB2
VFB1/REQ
. (3c)
Then find R3, where:
0
ID
IPeak
t
R3 = REQ - R2.
(3d)
0t
Figure 7: Voltage and current waveforms for boost topology in CS5111.
7

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부품번호상세설명 및 기능제조사
CS5111YDWFR24

1.4A Switching Regulator with 5V/ 100mA Linear Regulator with Watchdog/ RESET and ENABLE

Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

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