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CS5156 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS5156은 전자 산업 및 응용 분야에서
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부품번호 CS5156 기능
기능 CPU 5-Bit Nonsynchronous Buck Controller
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS5156 데이터시트, 핀배열, 회로
CS5156
CPU 5-Bit Nonsynchronous Buck Controller
Description
Features
The CS5156 is a 5-bit nonsyn-
chronous N-Channel buck con-
troller. It is designed to provide
unprecedented transient response
for today’s demanding high-densi-
ty, high-speed logic. The regulator
operates using a proprietary control
method, which allows a 100ns
response time to load transients.
The CS5156 is designed to operate
over a 4.25-16V range (VCC) using
12V to power the IC and 5V as the
main supply for conversion.
The CS5156 is specifically designed
to power Pentium® II processors
and other high performance core
logic. It includes the following fea-
tures: on board, 5-bit DAC, short
circuit protection, 1.0% output tol-
erance, VCC monitor, and pro-
grammable soft start capability. The
CS5156 is backwards compatible
with the 4-bit CS5151, allowing the
mother board designer the capabili-
ty of using either the CS5151 or the
CS5156 with no change in layout.
The CS5156 is available in 16 pin
surface mount and DIP packages.
Application Diagram
Switching Power Supply for core logic - Pentium® II processor
12V 5V
VID0
VID1
VID2
VID3
VID4
330pF
0.1µF
1200µF/16V x 3
AlEl
VCC1 VCC2
VGATE
VID0
VID1
VID2
VID3
VID4
CS5156
COFF
PGnd
IRL3103
2µH
2
MBR1535CT
1,3
1.3V to 3.5V @ 13A
1200µF/16V x 5
AlEl
0.1µF
SS
COMP
0.33µF
LGnd
VFB
VFFB
3.3k
100pF
V2 is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
s N-Channel Design
s Excess of 1MHz Operation
s 100ns Transient Response
s 5-Bit DAC
s Backward Compatible with
4-Bit CS5150/5151 and
Adjustable CS5120/5121
s 30ns Gate Rise/Fall Times
s 1% DAC Accuracy
s 5V & 12V Operation
s Remote Sense
s Programmable Soft Start
s Lossless Short Circuit
Protection
s VCC Monitor
s Adaptive Voltage
Positioning
s V2™ Control Topology
s Current Sharing
s Overvoltage Protection
Package Options
16 Lead SO Narrow & PDIP
VID0 1
VID1
VID2
VID3
SS
VID4
COFF
VFFB
VFB
COMP
LGnd
VCC1
NC
PGnd
VGATE
VCC2
Rev. 1/5/99
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




CS5156 pdf, 반도체, 판매, 대치품
Electrical Characteristics: 0°C < TA < +70°C; 0°C < TJ < +85°C; 8V < VCC1 < 14V; 5V < VCC2 < 14V; DAC Code: VID4 = VID2 = VID1
= VID0 = 1; VID3 = 0; CVGATE = 1nF; COFF = 330pF; CSS = 0.1µF, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s Supply Current
ICC1
ICC2
Operating ICC1
Operating ICC2
No Switching
No Switching
VFB = COMP = VFFB
VFB = COMP = VFFB
8.5 13.5 mA
1.6 3.0
mA
8 13 mA
25
mA
s COFF
Normal Charge Time
Extension Charge Time
Discharge Current
VFFB = 1.5V; VSS = 5V
VSS = VFFB = 0
COFF to 5V; VFB >1V
1.0 1.6
2.2
µs
5.0 8.0
11.0
µs
5.0 mA
s Time Out Timer
Time Out Time
Fault Mode Duty Cycle
VFB = VCOMP; VFFB = 2V;
Record VGATE Pulse High Duration
VFFB = 0V
Note 1: Guaranteed by design, not 100% tested in production.
10
35
30
50
50
65
µs
%
PACKAGE PIN #
16L SO Narrow & PDIP
1,2,3,4,6
5
7
8
9
10
PIN SYMBOL
VID0 – VID4
SS
COFF
VFFB
VCC2
VGATE
Package Pin Description
FUNCTION
Voltage ID DAC input pins. These pins are internally pulled up to 5V
providing logic ones if left open. VID4 selects the DAC range. When VID4
is High (logic one), the DAC range is 2.14V to 3.54V with 100mV incre-
ments. When VID4 is Low (logic zero), the DAC range is 1.34V to 2.09V
with 50mV increments. VID0 - VID4 select the desired DAC output volt-
age. Leaving all 5 DAC input pins open results in a DAC output voltage
of 1.244V, allowing for adjustable output voltage, using a traditional
resistor divider.
Soft Start Pin. A capacitor from this pin to LGnd in conjunction with
internal 60µA current source provides soft start function for the con-
troller. This pin disables fault detect function during Soft Start. When a
fault is detected, the soft start capacitor is slowly discharged by internal
2µA current source setting the time out before trying to restart the IC.
Charge/discharge current ratio of 30 sets the duty cycle for the IC when
the regulator output is shorted.
A capacitor from this pin to ground sets the time duration for the on
board one shot, which is used for the constant off time architecture.
Fast feedback connection to the PWM comparator. This pin is connected
to the regulator output. The inner feedback loop terminates on time.
Boosted power for the gate driver.
MOSFET driver pin capable of 1.5A peak switching current.
4

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CS5156 전자부품, 판매, 대치품
Applications Information: continued
When regulator output voltage achieves the 1V level pre-
sent at the COMP pin, regulation has been achieved and
normal off time will ensue. The PWM comparator termi-
nates the switch on
capacitor. The V2
time, with off time set by the COFF
control loop will adjust switch duty
cycle as required to ensure the regulator output voltage
tracks the output of the error amplifier.
The soft start and COMP capacitors will charge to their
final levels, providing a controlled turn on of the regulator
output. Regulator turn on time is determined by the COMP
capacitor charging to its final value. Its voltage is limited
by the soft start COMP clamp and the voltage on the soft
start pin (see Figures 2 and 3).
Trace 1 - Regulator Output Voltage (5V/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Figure 4: CS5156 demonstration board enable startup waveforms.
Trace 1 - Regulator Output Voltage (1V/div.)
Trace 2 - Inductor Switching Node (2V/div.)
Trace 3 - 12V input (VCC1 and VCC2) (5V/div.)
Trace 4 - 5V Input (1V/div.)
Normal Operation
During normal operation, switch off time is constant and
sVe2t™bycothnetrColOlFoFocpaptoacmitaoirn. tSawinitrcehgounlattiimone.
is adjusted by
This results in
the
changes in regulator switching frequency, duty cycle, and
output ripple in response to changes in load and line.
Output voltage ripple will be determined by inductor rip-
ple current working into the ESR of the output capacitors
(see Figures 5 and 6).
Figure 2: CS5156 demonstration board startup in response to increasing
12V and 5V input voltages. Extended off time is followed by normal off
time operation when output voltage achieves regulation to the error
amplifier output.
Trace 1 - Regulator Output Voltage (10V/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Trace 1 - Regulator Output Voltage (1V/div.)
Trace 3 - COMP Pin (error amplifier output) (1V/div.)
Trace 4 - Soft Start Pin (2V/div.)
Figure 5: Peak-to-peak ripple on VOUT = 2.8V, IOUT = 0.5A (light load).
Figure 3: CS5156 demonstration board startup waveforms.
If the input voltage rises quickly, or the regulator output is
enabled externally, output voltage will increase to the level
set by the error amplifier output more rapidly, usually
within a couple of cycles (see Figure 4).
7

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