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부품번호 LX1661 기능
기능 ADVANCED PWM CONTROLLER
제조업체 Microsemi Corporation
로고 Microsemi Corporation 로고


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LX1661 데이터시트, 핀배열, 회로
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 1660
LX1660/1661
ADVANCED PWM CONTROLLER
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The LX1660 and LX1661 Are Mono-
lithic Switching Regulator Controller
ICs designed to provide low-cost, high-
performance adjustable power supply for
microprocessors and other applications
requiring a fast transient response and a
high degree of accuracy. They provide
an adjustable synchronous Pulse Width
Modulator output suitable for a power
supply for Pentium® or other micropro-
cessors.
Synchronous Rectifier Driver For
CPU Core. The devices can drive dual
MOSFETs resulting in typical efficiencies
of 85 - 90%, even with loads in excess of
10A. Synchronous shutdown results in
increased efficiency in light load applica-
tions.
Short-Circuit Current Limiting
Without Expensive Current Sense Re-
sistors. The current sensing mechanism
can use a PCB trace resistance or the para-
sitic resistance of the main inductor. For
applications requiring a high degree of
accuracy, a conventional sense resistor
can be used.
Hiccup Mode Fault Protection. The
hiccup mode is programmable and with
pulse-by-pulse current limiting will help
protect the power supply system and load
in the even of a short circuit.
Ultra-Fast Transient Response Re-
duces System Cost. The fixed frequency
modulated off-time architecture results in
the fastest transient response for a given
inductor. Adaptive voltage positioning
(LX1661 only) requires fewer low-ESR ca-
pacitors to meet stringent transient over-
and under-shoot specifications.
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
LX1661 IN SOCKET 7
PROCESSOR SUPPLY
APPLICATION
OUTEN
PRODUCT HIGHLIGHT
12V
KEY FEATURES
s Designed To Drive A Synchronous Rectifier
Stage — Can Also Be Used In Non-
Synchronous Applications
s Soft-Start Capability
s Hiccup-Mode Fault Protection
s No Current-Sense Resistor Required For
Current Limiting
s Modulated Constant Off-Time Control
Mechanism For Fast Transient Response And
Simple System Design
s 2V, 0.5% Internal Voltage Reference Brought
Out
A P P L I C AT I O N S
s Pentium Processor Supplies
s AMD-K6TM Supplies
s Cyrix® 6x86TM Supplies
s Voltage Regulator Modules
s General Purpose DC:DC Supplies
C2 C7
VIN 5V
R14, 1%
See Table 5
R15
2.0k
1%
R16
10k
C3
0.1µF
C4
390pF
C8
390pF
U1
LX1661
1 EN
2 OTADJ
3 SGND
4 VREF
5 INV
6 NINV
7 HICCUP
8 CT
VC1 16
TDRV 15
PGND 14
BDRV 13
VCC 12
SYNCEN 11
CS+ 10
CS- 9
16-pin SOIC
Q1
IRL3103
16V, 1000µF
Sanyo MV-GX or equivalent
VOUT
C9
1µF
L1
R1, 5m
5µH Toroid
C5 C6
D1
R5, 1k
C1
390pF
R6, 1k
16V, 1000µF
Sanyo MV-GX or
equivalent
Copyright © 1998
Rev. 1.1 7/98
PACKAGE ORDER INFORMATION
TA (°C)
N
Plastic DIP
16-pin
D
Plastic SOIC
16-pin
0 to 70
LX166xCN
LX166xCD
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX166xCDT)
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1




LX1661 pdf, 반도체, 판매, 대치품
LX1660/1661
PRODUCT DATABOOK 1996/1997
ADVANCED PWM CONTROLLER
PRODUCTION DATA SHEET
BLOCK DIAGRAM
EN 1
ENABLE
OTADJ 2
SGND 3
1.4V
VCC
2V OUT
UVLO
10.6/10.1
VREF 4
INV 5
NINV/SS 6
HICCUP 7
CT 8
40mV (1661 only)
ERROR
COMP
OTADJ
VPEAK = 2V
VVAL = 1V
UPGRADE
0.7V
2V REF
EN INTERNAL
VCC VREG 5V
VREG GOOD
PWM LATCH
SQ
R DOM R
Q
BREAK
BEFORE
MAKE
OFFTIME CONTROL
SYNC EN
COMP
VCC
10 I
SQ
RQ
HICCUP LATCH
I
HICCUP
1.5V
IMAX
90mV
16 VC1
15 TDRV
14 PGND
13 BDRV
12 VCC
11 SYNCEN
10 CS+
9 CS-
FIGURE 1 — Block Diagram
4 Copyright © 1998
Rev. 1.1 7/98

4페이지










LX1661 전자부품, 판매, 대치품
PRODUCT DATABOOK 1996/1997
ADVANCED PWM CONTROLLER
PR O D U C T I O N D ATA S H E E T
LX1660/1661
T H E O R Y O F O P E R A T I O N (continued)
ERROR VOLTAGE COMPARATOR
The error voltage comparator compares the feedback voltage at
the positive side of the sense resistor to the set voltage (set voltage
plus 40mV in LX1661). An external filter is recommended for high-
frequency noise.
CURRENT LIMIT AND HICCUP SECTIONS
Current limiting is performed by sensing the inductor current
across the sense resistor. Exceeding this threshold turns the
output drive OFF and latches it OFF until the PWM latch set input
goes high again. To reduce stress on the external MOSFET and
SCR during output shorts or heavy-load conditions, a hiccup
circuit is incorporated, which provides 10% duty cycle. The
hiccup time is programmed via a capacitor at the HICCUP pin. A
low voltage at this pin disables the hiccup function.
OFF TIME CONTROL TIMING SECTION
The timing capacitor CT allows programming of the OFF-time. The
timing capacitor is quickly charged during the ON time of the top
MOSFET and allowed to discharge when the top MOSFET is OFF.
OFF TIME CONTROL TIMING SECTION (continued)
In order to minimize frequency variations while providing
different supply voltages, the discharge current is modulated by
the voltage at the OTADJ pin. The OFF-time is inversely propor-
tional to the OTADJ voltage. If the OTADJ voltage drops below 0.7V,
the IC shuts down into a low quiescent current mode.
UNDER VOLTAGE LOCKOUT AND SHUTDOWN SECTION
The purpose of the UVLO is to keep the output drive off and to
maintain low quiescent current until the input voltage reaches the
start-up threshold. At voltages below the start-up voltage, the
UVLO comparator disables the internal biasing, and turns off the
output drives. The NINV pin is pulled low.
SYNCHRONOUS CONTROL SECTION
The synchronous control section incorporates a unique break-
before-make function to ensure that the primary switch and the
synchronous switch are not turned on at the same time. Approxi-
mately 100 nanoseconds of deadtime is provided by the break-
before-make circuitry to protect the MOSFET switches.
APPLICATION INFORMATION
12V
See Note 1
Fuse (F1)
is optional
F1
VIN 5V
VOUT = VREF * (1 + R14/R15)
(VREF = 2.0V)
R14
1.3k (See Table 5)
R15
2.0k
R16
10k
R3, 1k
R4
1k
C4
390pF
C3
0.1µF
C7
0.1µF
C8
680pF
LX1660
1 EN
2 OTADJ
3 SGND
VC1 16
TDRV 15
PGND 14
4 VREF
5 INV
6 NINV
BDRV 13
VCC 12
SYNCEN 11
7 HICCUP
CS+ 10
8 CT
CS- 9
16-pin SOIC
C2 x 3
6.3V, 1500µF
Sanyo MV-GX
or equivalent
Q1
IRL3103
C9 L1
1µF
5µH Toroid
D1
See Note 4
R1, 5m
C1 R5, 1k
390pF
R6, 1k
VOUT 3.3V
See Note 2
C5 x 6
6.3V, 1500µF
Sanyo MV-GX or
equivalent
See Note 3
Notes
1. The number of capacitors within this bank may be reduced for cost savings at a penalty of increased ripple on the input bus.
2. The number of capacitors in the output filter bank may be reduced by two in a typical application; more may be removed for systems
with lesser transient requirements.
3. If pulse-by-pulse current limiting is desired, remove C7 and short LX1660 pin 7 to ground.
4. D1 is Motorola MBR1035 for 10A capability; downsize as per required current.
Figure 4 — LX1660 Controller Used In A Typical Stand-Alone High-Current 5V To 3.3V Regulator Application
Copyright © 1998
Rev. 1.1 7/98
7

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관련 데이터시트

부품번호상세설명 및 기능제조사
LX1660

ADVANCED PWM CONTROLLER

Microsemi Corporation
Microsemi Corporation
LX1661

ADVANCED PWM CONTROLLER

Microsemi Corporation
Microsemi Corporation

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