參數(shù)資料
型號： MAX1684
廠商： Maxim Integrated Products, Inc.
英文描述： Low-Noise, 14V Input, 1A, PWM Step-Down Converters
中文描述： 低噪聲、14V輸入、1A、PWM降壓型轉(zhuǎn)換器
文件頁數(shù)： 12/16頁
文件大?。?/td> 234K
代理商： MAX1684
M
Low-Noise, 14V Input, 1A, PWM
S tep-Down Converters
MAX1684
MAX1685
LX
AIN
IN
CVH
FB
L
C1
MBRS
130LT3
R1
R2
BOOT
PGND
AGND
CC
SHDN
STBY
CVL
SYNC/PWM
0.1
μ
F
22
μ
F
0.1
μ
F
100
μ
F
-V
OUT
-1.25V
TO-5.5V
-V
OUT
= -1.25V
( )
V
IN
1
μ
F
0.1
μ
F
REF
ILIM/SS
0.01
μ
F
0.01
μ
F
R2 + 1
V
IN
, MAX = 14V -
|
V
OUT
|
Figure 4. Inverting Output
Table 2. Inductor and Minimum Output Capacitor Selection
Table 3. Component Suppliers
22
220
MAX1684 (300kHz)
1.25 to 2.7
SUPPLIER
PHONE
10
100
MAX1685 (600kHz)
L
(μH)
MIN C
OUT
(μF)
L
(μH)
MIN C
OUT
(μF)
V
OUT
(V)
22
100
10
47
2.7 to 4
47
68
22
33
4 to 6
68
47
33
22
6 to 14
CAPACITORS
FAX
803-626-3123
803-946-0690
AVX
714-960-6492
714-969-2591
Matsuo
619-661-1055
619-661-6835
Sanyo
INDUCTORS
847-956-0702
847-956-0666
Sumida
847-639-1469
847-639-6400
Coilcraft
814-238-0490
814-237-1431
Murata-Erie
847-390-4428
847-390-4373
TDK
DIODES
602-994-6430
602-303-5454
Motorola
603-224-1430
603-224-1961
Sprague
847-956-0702
847-956-0666
Sumida
offer the lowest ESR overall. Sanyo OS-CON capacitors
have the lowest ESR of the high-value electrolytic
types. Use ceramic and OS-CON capacitors for very
compact, high-reliability, or wide-temperature applica-
tions, where expense is justified. When using very low-
ESR capacitors, such as ceramic or OS-CON, check
for stability while examining load-transient response,
and increase the output compensation capacitor if
needed. Table 3 lists suppliers for the various compo-
nents used with the MAX1684/MAX1685.
Ensure that the minimum capacitance value and maxi-
mum ESR values are met:
C
OUT >
I
OUT MAX
/ (V
OUT
·
AC Load Reg
·
f
OSC
)
R
ESR
< 2
·
AC Load Reg
·
V
OUT
/I
OUT MAX
where I
OUT MAX
= 1A, AC Load Reg
1.4%, and
f
OSC
= 300kHz (MAX1684) or 600kHz (MAX1685).
Output Diode S elec tion
Use a 1A external Schottky diode (MBRS130LT3 or
equivalent) for the output rectifier to pass inductor cur-
rent during the start of the second half of each cycle.
This diode operates before the internal N-channel
MOSFET completely turns on and during high-current
operation. Use a Schottky diode to avoid forward bias-
ing the internal body diode of the N-channel MOSFET.
12
______________________________________________________________________________________
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