LT1270(Rev_B) 데이터 시트보기 (PDF) - Linear Technology
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LT1270 Datasheet PDF : 4 Pages
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LT1270A/LT1270
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.
SYMBOL
ILIM
ILIM
∆IIN
∆ISW
f
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%, TJ ≤ 100°C
Duty Cycle = 80%, TJ ≤ 100°C
Duty Cycle = 50%, TJ ≤ 100°C
Duty Cycle = 80%, TJ ≤ 100°C
DCMAX
Maximum Switch Duty Cycle
Flyback Sense Delay Time
Shutdown Mode Supply Current
Shutdown Mode Threshold Voltage
3V ≤ VIN ≤ VMAX, VC = 0.05V
3V ≤ VIN ≤ VMAX
MIN
q
8
q
6
q
10.0
q
7.5
50
q
50
80
100
q
50
TYP
MAX
16
14
16.0
14.0
25
40
60
70
70
92
95
1.5
100
400
150
250
300
UNITS
A
A
A
A
mA/A
kHz
kHz
%
µs
µA
mV
mV
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Measured with VC in Hi Clamp, VFB = 0.8V.
Note 2: For duty cycles (DC) between 50% and 80%, minimum guaranteed
switch current is given by ILIM = 6.67 (1.7 – DC) for the LT1270 and ILIM =
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.
TYPICAL PERFOR A CE CHARACTERISTICS
Switch Current Limit vs Duty Cycle
2.4
1.8
–55°C
25°C
1.2
125°C
6
0
0
20
40
60
80 100
DUTY CYCLE (%)
LT1270 • TA03
Switch Saturation Voltage
1.6
TJ = 25°C
1.2
0.8
0.4
0
0
2
4
6
8
10
SWITCH CURRENT (A)
LT1270 • TA04
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.
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