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參數(shù)資料
| 型號： | LX1665CDW |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO18 |
| 封裝： | PLASTIC, SOIC-18 |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 354K |
| 代理商： | LX1665CDW |
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
LX1664/1664A, LX1665/65A
PRODUCT DA T ABOOK 1996/1997
11
Copyright 1999
Rev. 1.2 11/99
P RODUCTION D ATA S HEET
BILL OF MATERIALS
C
1
1500F, 6.3V capacitor
MV-GX Sanyo
4
C
2
1500F, 6.3V capacitor
MV-GX Sanyo
2
C
7, C9
330F, Electrolytic
MV-GX Sanyo
2
C
3
0.1F
SMD Cap
1
C
4
390pF
SMD Cap
1
C
8
680pF
SMD Cap
1
C
5
1F, 16V
SMD Ceramic
1
L
1
2.5H Inductor
HM0096832 BI or equivalent
1
L
2
1H Inductor
1
Q
1
MOSFET
IRL3102 International Rectifier or equivalent
1
Q
2
MOSFET
IRL3303 International Rectifier or equivalent
1
Q
3
MOSFET
IRLZ44 International Rectifier or equivalent
1
R
5, R6
Resistor (See Table 6 for values)
SMD Resistor
2
R
1
2.5m Sense Resistor
IRC OARS-1 or PCB trace
1
U1
Controller IC
LX1665CDW Linfinity
1
Total
21
Ref
Description
Part Number / Manufacturer
Qty.
LX1665 Bill of Materials (Refer to Product Highlight)
USING THE LX1664/65 DEVICES
The LX1664/65 devices are very easy to design with, requiring
only a few simple calculations to implement a given design. The
following procedures and considerations should provide effec-
tive operation for virtually all applications. Refer to the Appli-
cation Information section for component reference designa-
tors.
TIMING CAPACITOR SELECTION
The frequency of operation of the LX166x is a function of duty
cycle and OFF-time. The OFF-time is proportional to the timing
capacitor (which is shown as C
8 in all application schematics in
this data sheet), and is modulated to minimize frequency
variations with duty cycle. The frequency is constant, during
steady-state operation, due to the modulation of the OFF-time.
The timing capacitor (C
T)
should be selected using the
following equation:
C
T =
Where I
DIS is fixed at 200A and fS is the switching frequency
(recommended to be around 200kHz for optimal operation and
component selection).
When using a 5V input voltage, the switching frequency (f
S)
can be approximated as follows:
C
T = 0.621 *
Choosing a 680pF capacitor will result in an operating
frequency of 183kHz at V
OUT = 2.8V.
When a 12V power input
is used, he capacitor value must be changed (the optimal timing
capacitor for 12V input will be in the range of 1000-1500pF).
L
1 OUTPUT INDUCTOR SELECTION
The inductance value chosen determines the ripple current
present at the output of the power supply. Size the inductance
to allow a nominal ±10% swing above and below the nominal DC
load current, using the equation L = V
L * T/I, where T is the
OFF-time, V
L is the voltage across the inductor during the OFF-
time, and
I is peak-to-peak ripple current in the inductor. Be
sure to select a high-frequency core material which can handle
the DC current, such as 3C8, which is sized for the correct power
level. Typical inductance values can range from 2 to 10H.
Note that ripple current will increase with a smaller inductor.
Exceeding the ripple current rating of the capacitors could cause
reliability problems.
(1 - V
OUT /VIN ) * IDIS
f
S (1.52 - 0.29 * VOUT )
I
DIS
f
S
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