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參數(shù)資料
| 型號： | LTC3458 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 8位微控制器 |
| 英文描述： | ECONOLINE: RSZ/P - 1kVDC |
| 中文描述： | ECONOLINE：RSZ / P - 1kVDC 2kVDC隔離UL94V - 0封裝材料所需的散熱片，無外置。組件所需的環(huán)形磁ContinuousShort電路保護（/ P的后綴） |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 389K |
| 代理商： | LTC3458 |
LTC3458L
7
3458lf
PIU
SW (Pin 1):
Switch Pin for Inductor Connection. During
discontinuous conduction mode an antiring resistor con-
nects SW to V
IN
to reduce noise.
V
IN
(Pin 2):
Input Supply Pin. Connect this to the input
supply and decouple with 1
μ
F minimum.
SYNC (Pin 3):
Oscillator Synchronization Pin. A clock
pulse width of 100ns to 2
μ
s is required to synchronize the
internal oscillator. This pin is disabled when grounded.
SHDN (Pin 4):
Shutdown Pin. Grounding this pin shuts
down the IC. Connect to >1.25V to enable.
I
LIM
(Pin 5):
Adjustable Peak Current Limit. Connect a
resistor from I
LIM
to GND to program the peak inductor
current according to the following formula:
I
R
LIMIT
ILIM
=
180
where I
LIMIT
is in amps and R
T
is in k
.
R
T
(Pin 6):
Connect a resistor to ground to program the
oscillator frequency, according to the formula:
f
R
OSC
T
=
1
.
0 2 0 004
.
where f
OSC
is in MHz and R
T
is in k
.
Oscillator frequency can be programmed between 400kHz
and 1.5MHz.
FB (Pin 7):
Connect Resistor Divider Tap Here. The output
voltage can be adjusted from 2V to 6V. Feedback reference
voltage is typically 1.225V.
COMP (Pin 8):
g
m
Error Amp Output. A frequency com-
pensation network is connected from this pin to ground to
compensate the loop. See the section “Compensating the
Feedback Loop” for guidelines.
GND (Pin 9):
Signal Ground Pin.
SS (Pin 10):
Connect a capacitor between this pin and
ground to set soft-start period. 5
μ
A of current is sourced
from SS during soft-start.
t(msec) = C
SS
(
μ
F ) 200
BURST (Pin 11):
Burst Mode Threshold Adjust Pin. A
resistor/capacitor combination from this pin to ground
programs the average load current at which automatic
Burst Mode operation is entered, according to the formula:
R
I
BURST
BURST
=
10
where R
BURST
is in k
and I
BURST
is in amps.
C
C
V
BURST
OUT
10 000
OUT
=
,
where C
BURST(MIN)
and C
OUT
are in
μ
F.
To force fixed frequency PWM mode, connect BURST to
V
OUT
through a 51k resistor.
V
OUT
(Pin 12):
Output of the Synchronous Rectifier and
Internal Gate Drive Source for the Power Switches.
R
R
2
Exposed Pad (PGND) (Pin 13):
Must be soldered to PCB
ground, for electrical contact and optimum thermal
performance.
V
OUT
=
+
1 225 1
.
1
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