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參數(shù)資料
| 型號： | LTC1530IS8-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 288K |
| 代理商： | LTC1530IS8-3.3 |
10
LTC1530
Figure 5b is derived based on the condition that
I
LMAX
= I
LOAD
+ I
RIPPLE
/2. Therefore, it only provides the
minimum R
IMAX
value. It must be understood that during
the initial power-up phase (V
OUT
= 0V), the initial start-up
I
LMAX
can be much higher than the steady state condition
I
LMAX
. Therefore, R
IMAX
must be selected with the start-up
I
LMAX
in mind. In general, high output capacitance com-
bined with a low value inductor increases the start-up
I
LMAX
. Figures 6a and 6b plot the start-up I
LMAX
vs output
capacitance and inductance for unloaded and loaded con-
ditions with the current limit circuit disabled. Figures 6a
and 6b are provided as examples. Actual I
LMAX
under
start-up conditions must be measured for any application
circuit so that R
IMAX
can be properly chosen.
In order for the current limit circuit to operate properly and
to obtain a reasonably accurate current limit threshold, the
I
MAX
and I
FB
pins must be Kelvin sensed at Q1’s drain and
source pins. A 0.1
μ
F decoupling capacitor can also be
connected across R
IMAX
to filter switching noise. In addi-
tion, LTC recommends that the voltage drop across the
R
IMAX
resistor be set to
≥
100mV. Otherwise, noise spikes
or ringing at Q1’s source can cause the actual current limit
to be greater than the desired current limit set point.
MOSFET Gate Drive
The PV
CC
supply must be greater than the input supply
voltage, V
IN
, by at least one power MOSFET V
GS(ON)
for
efficient operation. This higher voltage can be supplied
with a separate supply, or it can be generated using a
simple charge pump as shown in Figure 7. The 86%
maximum duty cycle ensures sufficient off-time to refresh
the charge pump during each cycle.
As PV
CC
is powered up from 0V, the LTC1530 undervoltage
lockout circuit prevents G1 and G2 from pulling high until
PV
CC
reaches about 3.5V. To prevent Q1’s high R
DS(ON)
from triggering the current limit comparator while PV
CC
is
slewing, the current limit circuit is disabled until PV
CC
is
≥
8V. In addition, on start-up or recovery from thermal
shutdown, the driver logic is designed to hold G2 low until
G1 first goes high.
I
LMAX
(A)
0
M
I
)
5500
4500
3500
2500
1500
500
16 18
1530 F05b
4
2
6
8
10
14
12
20
R
IMAX
≥
500
I
LMAX
= I
LOAD
+ I
RIPPLE
/2
Q1 R
DS(ON)
= 0.05
0.04
0.03
0.02
0.01
Figure 5b. Minimum Required R
IMAX
vs I
LMAX
OUTPUT CAPACITANCE (mF)
0
S
L
25
20
15
10
5
0
2
4
6
8
1530 F06a
10
12
T
A
= 25
°
C
V
IN
= 5V
I
LOAD
= 0A
L = 1.2
μ
H
L = 4.7
μ
H
L = 2.4
μ
H
Figure 6a. Start-Up I
LMAX
vs Output Capacitance
OUTPUT CAPACITANCE (mF)
0
S
L
30
25
20
15
10
5
0
2
4
6
8
1530 F06b
10
12
T
A
= 25
°
C
V
IN
= 5V
I
LOAD
= 10A
L = 1.2
μ
H
L = 4.7
μ
H
L = 2.4
μ
H
Figure 6b. Start-Up I
LMAX
vs Output Capacitance
APPLICATIOU
W
U
U
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