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CS5150 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS5150은 전자 산업 및 응용 분야에서
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부품번호 CS5150 기능
기능 CPU 4-Bit Synchronous Buck Controller
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS5150 데이터시트, 핀배열, 회로
CS5150
CPU 4-Bit Synchronous Buck Controller
Description
Features
The CS5150 is a 4-bit synchronous
dual N-Channel buck controller. It
is designed to provide unprece-
dented transient response for
today’s demanding high-density,
high-speed logic. The regulator
operates using a proprietary control
method, which allows a 100ns
response time to load transients.
The CS5150 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 CS5150 is specifically designed
to power Pentium® Pro processors
and other high performance core
logic. It includes the following fea-
tures: on board, 4-bit DAC, short
circuit protection, 1.0% output tol-
erance, VCC monitor, and pro-
grammable soft start capability. The
CS5150 is upward compatible with
the 5-bit CS5155, allowing the
mother board designer the capabili-
ty of using either the CS5150 or the
CS5155 with no change in layout.
The CS5150 is available in 16 pin
surface mount and DIP packages.
Application Diagram
Switching Power Supply for core logic - Pentium® Pro processor
12V 5V
0.1µF
VID0
VID1
VID2
VID3
330pF
VCC1
VCC2
VGATE(H)
VID0
VID1
VID2
VID3
CS5150
VGATE(L)
COFF
PGnd
0.1µF
SS
COMP
0.33µF
LGnd
VFB
VFFB
3.3k
100pF
1200µF/16V x 3
AlEl
IRL3103
2µH
2.1V to 3.5V @ 13A
IRL3103
1200µF/16V x 5
AlEl
s Dual N-Channel Design
s Excess of 1MHz Operation
s 100ns Transient Response
s 4-Bit DAC
s Upward Compatible with
5-Bit CS5155/5156 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 25ns FET Nonoverlap Time
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
NC
COFF
VFFB
VFB
COMP
LGnd
VCC1
VGATE(L)
PGnd
VGATE(H)
VCC2
V2 is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
Rev. 1/4/99
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




CS5150 pdf, 반도체, 판매, 대치품
Electrical Characteristics: 0°C < TA < +70°C; 0°C < TJ < +85°C; 8V < VCC1 < 14V; 5V < VCC2 < 14V; DAC Code: VID2 = VID1 =
VID0 = 1; VID3 = 0; CVGATE(L) and CVGATE(H) = 1nF; COFF = 330pF; CSS = 0.1µF, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s Time Out Timer
Time Out Time
Fault Mode Duty Cycle
VFB = VCOMP; VFFB = 2V;
Record VGATE(H) Pulse High Duration
VFFB = 0V
10
35
30
50
50
65
µs
%
Note 1: Guaranteed by design, not 100% tested in production.
PACKAGE PIN #
16L SO Narrow & PDIP
1,2,3,4
5
6
7
8
9
10
11
12
13
14
15
16
PIN SYMBOL
VID0 – VID3
SS
NC
COFF
VFFB
VCC2
VGATE(H)
PGnd
VGATE(L)
VCC1
LGnd
COMP
VFB
Package Pin Description
FUNCTION
Voltage ID DAC input pins. These pins are internally pulled up to 5V
providing logic ones if left open. The DAC range is 2.14V to 3.54V with
100mV increments. VID0 - VID3 select the desired DAC output voltage.
Leaving all 4 DAC input pins open results in a DAC output voltage of
1.244V, allowing for adjustable output voltage, using a traditional resis-
tor 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.
No connection.
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 high side gate driver.
High FET driver pin capable of 1.5A peak switching current. Internal cir-
cuit prevents VGATE(H) and VGATE(L) from being in high state simultane-
ously.
High current ground for the IC. The MOSFET drivers are referenced to
this pin. Input capacitor ground and the source of lower FET should be
tied to this pin.
Low FET driver pin capable of 1.5A peak switching current.
Input power for the IC and low side gate driver.
Signal ground for the IC. All control circuits are referenced to this pin.
Error amplifier compensation pin. A capacitor to ground should be pro-
vided externally to compensate the amplifier.
Error amplifier DC feedback input. This is the master voltage feedback
which sets the output voltage. This pin can be connected directly to the
output or a remote sense trace.
4

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CS5150 전자부품, 판매, 대치품
Applications Information: continued
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).
Trace1 - Regulator Output Voltage (10V/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Figure 6: Peak-to-peak ripple on VOUT = 2.8V, IOUT = 13A (heavy load).
Trace 1 - Regulator Output Voltage (5V/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Figure 4: CS5150 demonstration board enable startup waveforms.
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).
Trace 1 - Regulator Output Voltage (10V/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Figure 5: Peak-to-peak ripple on VOUT = 2.8V, IOUT = 0.5A (light load).
Transient Response
The CS5150 V2control loop’s 100ns reaction time pro-
vides unprecedented transient response to changes in
input voltage or output current. Pulse by pulse adjustment
of duty cycle is provided to quickly ramp the inductor cur-
rent to the required level. Since the inductor current cannot
be changed instantaneously, regulation is maintained by
the output capacitor(s) during the time required to slew the
inductor current.
Overall load transient response is further improved
through a feature called “adaptive voltage positioning”.
This technique pre-positions the output capacitor’s voltage
to reduce total output voltage excursions during changes
in load.
Holding tolerance to 1% allows the error amplifier’s refer-
ence voltage to be targeted +40mV high without compro-
mising DC accuracy. A “droop resistor“, implemented
through a PC board trace, connects the error amplifier’s
feedback pin (VFB) to the output capacitors and load and
carries the output current. With no load, there is no DC
drop across this resistor, producing an output voltage
tracking the error amplifier’s, including the +40mV offset.
When the full load current is delivered, an 80mV drop is
developed across this resistor. This results in output volt-
age being offset -40mV low.
The result of adaptive voltage positioning is that additional
margin is provided for a load transient before reaching the
output voltage specification limits. When load current sud-
denly increases from its minimum level, the output capaci-
tor is pre-positioned +40mV. Conversely, when load cur-
rent suddenly decreases from its maximum level, the out-
put capacitor is pre-positioned -40mV (see Figures 7, 8, and
9). For best transient response, a combination of a number
of high frequency and bulk output capacitors are usually
used.
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