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参数资料
| 型号： | LX1660CD-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, SOIC-16 |
| 文件页数： | 13/15页 |
| 文件大小： | 376K |
| 代理商： | LX1660CD-TR |
A D V ANCED PWM C ONTROLLER
LX1660/1661
PRODUCT DA T ABOOK 1996/1997
7
Copyright 1998
Rev. 1.1a 10/25/2004
P RODUCTION D AT A S HEET
THEOR Y OF OPERA TION (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 C
T 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 OT
ADJ pin.
The OFF-time is inversely propor-
tional to the OT
ADJ voltage. If the OT ADJ 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.
APPLICA TION INFORMA TION
EN
C
T
C8
680pF
TDRV
V
CC
CS-
OT
ADJ
SGND
V
REF
INV
NINV
HICCUP
CS+
SYNCEN
BDRV
PGND
V
C1
LX1660
C7
0.1F
R4
1k
R3, 1k
R16
10k
C3
0.1F
C4
390pF
R15
2.0k
R14
1.3k (See Table 5)
C9
1F
12V
L1
R1, 5m
6.3V, 1500F
Sanyo MV-GX or
equivalent
V
OUT 3.3V
R6, 1k
6.3V, 1500F
Sanyo MV-GX
or equivalent
F1
V
IN 5V
16-pin SOIC
Fuse (F1)
is optional
See Note 3
R5, 1k
C1
390pF
Q1
IRL3103
5H Toroid
D1
See Note 4
C5 x 6
See Note 2
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
C2 x 3
See Note 1
Figure 4 — LX1660 Controller Used In A Typical Stand-Alone High-Current 5V To 3.3V Regulator Application
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.
V
OUT = VREF
* (1 + R14/R15)
(V
REF = 2.0V)
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相关代理商/技术参数 |
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| LX1660CN | 功能描述:IC PWM MONO SWITCHING REG 16DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| LX1661 | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:ADVANCED PWM CONTROLLER |
| LX1661CD | 功能描述:IC PWM MONO SWITCHING REG 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| LX1661CN | 功能描述:IC PWM MONO SWITCHING REG 16DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
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