參數(shù)資料
型號(hào)： LT1270A
廠商： Linear Technology Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述： 射頻放大器
文件頁(yè)數(shù)： 3/4頁(yè)
文件大?。?/td> 165K
代理商： LT1270A
3
LT1270A/LT1270
SYMBOL
I
LIM
PARAMETER
Switch Current Limit (LT1270)
(Note 3)
Switch Current Limit (LT1270A)
(Note 3)
Supply Current Increase
During Switch-ON Time
Switching Frequency
CONDITIONS
Duty Cycle = 50%, T
J
≤
100
°
C
Duty Cycle = 80%, T
J
≤
100
°
C
Duty Cycle = 50%, T
J
≤
100
°
C
Duty Cycle = 80%, T
J
≤
100
°
C
MIN
8
6
10.0
7.5
TYP
MAX
16
14
16.0
14.0
40
UNITS
G
G
A
A
A
A
I
LIM
G
G
I
IN
I
SW
f
25
mA/A
50
50
80
60
70
70
95
kHz
kHz
%
μ
s
μ
A
mV
mV
G
DC
MAX
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode Supply Current
Shutdown Mode Threshold Voltage
92
1.5
100
150
3V
≤
V
IN
≤
V
MAX
, V
C
= 0.05V
3V
≤
V
IN
≤
V
MAX
400
250
300
100
50
G
ELECTRICAL CHARACTERISTICS
V
IN
= 15V, V
C
= 0.5V, V
FB
= V
REF
, switch pin open, unless otherwise noted.
The
G
denotes specifications which apply over the full operating
temperature range.
Note 1:
Measured with V
C
in Hi Clamp, V
FB
= 0.8V.
Note 2:
For duty cycles (DC) between 50% and 80%, minimum guaranteed
switch current is given by I
LIM
= 6.67 (1.7 – DC) for the LT1270 and I
LIM
=
8.33 (1.7 – DC) for the LT1270A.
Note 3:
Minimum current limit is reduced by 0.5A at 125
°
C. 100
°
C test
limits are guaranteed by correlation to 125
°
C tests.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
C
HARA TERISTICS
U
A
TYPICAL PERFOR
CE
Switch Saturation Voltage
Switch Current Limit vs Duty Cycle
DUTY CYCLE (%)
0
S
1.8
2.4
80
LT1270 TA03
1.2
6
0
20
40
60
100
–55°C
125°C
25°C
SWITCH CURRENT (A)
0
S
1.2
1.6
8
LT1270 TA04
0.8
0.4
0
2
4
6
10
T
J
= 25°C
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