LT1270(Rev_B) 데이터 시트보기 (PDF) - Linear Technology
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LT1270 Datasheet PDF : 4 Pages
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LT1270A/LT1270
ABSOLUTE AXI U RATI GS
Supply Voltage ....................................................... 30V
Switch Output Voltage ............................................ 60V
Feedback Pin Voltage (Transient, 1ms) ................ ±15V
Operating Junction Temperature Range
LT1270AC/LT1270C (Oper.)................ 0°C to 125°C
LT1270AC/LT1270C (Short-Ckt) ......... 0°C to 140°C
Storage Temperature Range ................ – 65°c to 150°C
Lead Temperature (Soldering, 10 sec)................ 300°C
PACKAGE/ORDER I FOR ATIO
FRONT VIEW
5
VIN
4
VSW
3
GND
2
FB
1
VC
T PACKAGE
5-LEAD TO-220
TJMAX = 100°C, θJA = 2°C/W, θJA = 50°C/ W
ORDER PART
NUMBER
LT1270CT
LT1270ACT
ELECTRICAL CHARACTERISTICS VIN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.
SYMBOL PARAMETER
VREF
Reference Voltage
IB
Feedback Input Current
gm
Error Amplifier
Transconductance
Error Amplifier Source of
Sink Current
Error Amplifier Clamp Voltage
Reference Voltage Line Regulation
AV
Error Amplifier Voltage Gain
Minimum Input Voltage
IQ
Supply Current
Control Pin Threshold
Normal/Flyback Threshold
on Feedback Pin
VFB
Flyback Reference Voltage
VFB
Change in Flyback Reference
Voltage
Flyback Reference Voltage
Line Regulation
Flyback Amplifier
Transconductance (gm)
Flyback Amplifier Source
and Sink Current
BV
Output Switch Breakdown
Voltage
VSAT
Output Switch ON
Resistance (Note 1, 3)
Control Voltage to Switch
Current Transconductance
CONDITIONS
Measured at Feedback Pin
VC = 0.8V
VFB = VREF
∆lC = ±25µA
VC = 1.5V
Hi Clamp, VFB = 1V
Lo Clamp, VFB = 1.5V
3V ≤ VIN ≤ VMAX, VC = 0.8V
0.9V ≤ VC ≤ 1.4V
3V ≤ VIN ≤ VMAX, VC = 0.6V
Duty Cycle = 0
IFB = 50µA
0.05 ≤ IFB ≤ 1mA
IFB = 50µA
3V ≤ VIN ≤ VMAX
∆lC = ±10µA
VC = 0.6V Source
IFB = 50µA Sink
3V ≤ VIN ≤ VMAX
ISW = 5mA
TJ ≤ 100°C
TJ ≤ 125°C
MIN
1.224
q
1.214
3000
q
2400
150
q
120
1.80
0.25
q
500
q
0.80
q
0.60
0.40
15.0
q
14.0
4.5
150
q
15
q
25
q
60
TYP
1.244
1.244
350
4400
200
0.38
800
2.8
7
0.90
0.45
16.3
6.8
0.01
300
32
40
75
0.12
12
MAX
1.264
1.274
750
1100
6000
7000
350
400
2.30
0.52
0.03
3.0
10
1.08
1.25
0.54
17.6
18.0
8.5
0.03
650
70
70
0.18
0.22
UNITS
V
V
nA
nA
µmho
µmho
µA
µA
V
V
%/V
V/V
V
mA
V
V
V
V
V
V
%/V
µmho
µA
µA
V
Ω
Ω
A/ V
2
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