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LT1534C Datasheet

  • LT1534C

  • Linear Technology [Ultralow Noise 2A Switching Regulators]

  • LINER

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LT1534/LT1534-1
APPLICATIONS INFORMATION
2. Calculate peak inductor current at full load current to
ensure that the inductor will not saturate. Peak current
can be significantly higher than output current, espe-
cially with smaller inductors and lighter loads, so don鈥檛
omit this step. Powdered iron cores are forgiving be-
cause they saturate softly, whereas ferrite cores satu-
rate abruptly. Other core material falls in between. The
following formula assumes continuous mode opera-
tion but it errors only slightly on the high side for dis-
continuous mode, so it can be used for all conditions.
3. Choose a core geometry. For low EMI problems a
closed structure should be used such as a pot core, ER
core, E core or toroid (see AN70 appendix I).
4. Select an inductor that can handle peak current, aver-
age current (heating effects) and fault current.
5. Finally, double check output voltage ripple. The experts
in the Linear Technology Applications department have
experience with a wide range of inductor types and can
assist you in making a good choice.
Further Help
AN70 has more information on noise in switching regula-
tors and its measurement. AN19 has general information
on switcher design. The Linear Technology applications
group is always ready to lend a helping hand.
錚?/div>
錚?/div>
V
OUT
V
IN
V
OUT
鈥?V
IN
I
PEAK
=
I
OUT
錚?/div>
+
錚?/div>
錚?/div>
V
IN
2 鈥?L 鈥?f 鈥?V
OUT
錚?/div>
錚?/div>
錚?/div>
L = inductance value
V
IN
= supply voltage
V
OUT
= output voltage
I = output current
f = oscillator frequency
(
)
TYPICAL APPLICATIO S
Low Noise
鹵12V
Dual Output Flyback Converter with Dual Polarity Output Voltage Sensing
MBR330
2.7V TO 10V
10碌F
P6KE-20A
10
1N4148
2
15
V
IN
COL
4
8
1
T1
7
L1
50碌H
12V
50mA
12
4
2700pF
5
16.9k
6
SHDN
SYNC
2
9
NOTE 1
3
MBR330
PGND
C
T
R
T
R
CSL
LT1534-1
R
VSL
3
14
10鈩?/div>
1nF
13
7
21.5k
1%
2.49k
1%
9.31k
1%
NOTE 1: 25nH TRACE INDUCTANCE
OR COILCRAFT B10T
L1, L2: COILTRONICS CTX50-4
11
10k
V
C
GND
1,8,
9,16
NFB
FB
10
2.49k
1%
0.047碌F
U
W
U
U
U
+
C1
47碌F
+
47碌F
+
C2
47碌F
L2
50碌H
+
47碌F
鈥?12V
50mA
OPTIONAL
T1: PHILIPS EFD-15-3F3 CORE
GAP FOR PRIMARY
L = 100碌H
PIN 1 TO TO 10, 16 TURNS 24AWG
PIN 3 TO 8, 45 TURNS 38AWG
PIN 4 TO 7, 45 TURNS 36AWG
PIN 2 TO 9, 16 TURNS 24AWG
1534 TA04
13

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