LT1270C 데이터 시트보기 (PDF) - Linear Technology
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LT1270C Datasheet PDF : 4 Pages
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LT1270A/LT1270
ABSOLUTE AXI U RATI GS
(Note 1)
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
TAB
4
VSW
IS
3
GND
GND
2
FB
1
VC
T PACKAGE
5-LEAD PLASTIC TO-220
TJMAX = 100°C, θJA = 2°C/W, θJA = 50°C/ W
ORDER PART
NUMBER
LT1270CT
LT1270ACT
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.5V, VFB = VREF, switch pin open, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VREF
Reference Voltage
IB
Feedback Input Current
Measured at Feedback Pin
VC = 0.8V
VFB = VREF
1.224
1.244
1.264
V
q
1.214
1.244
1.274
V
350
750
nA
1100
nA
gm
Error Amplifier
Transconductance
∆lC = ±25µA
3000
4400
6000
q
2400
7000
µmho
µmho
Error Amplifier Source of
Sink Current
VC = 1.5V
150
200
350
µA
q
120
400
µA
Error Amplifier Clamp Voltage
Hi Clamp, VFB = 1V
Lo Clamp, VFB = 1.5V
Reference Voltage Line Regulation 3V ≤ VIN ≤ VMAX, VC = 0.8V
AV
Error Amplifier Voltage Gain
0.9V ≤ VC ≤ 1.4V
Minimum Input Voltage
1.80
2.30
V
0.25
0.38
0.52
V
q
0.03
%/V
500
800
V/V
q
2.8
3.0
V
IQ
Supply Current
Control Pin Threshold
3V ≤ VIN ≤ VMAX, VC = 0.6V
Duty Cycle = 0
7
10
mA
0.70
0.90
1.08
V
q
0.50
1.25
V
Normal/Flyback Threshold
on Feedback Pin
0.40
0.45
0.54
V
VFB
Flyback Reference Voltage
IFB = 50µA
15.0
16.3
17.6
V
q
14.0
18.0
V
VFB
Change in Flyback Reference
Voltage
0.05 ≤ IFB ≤ 1mA
4.5
6.8
8.5
V
Flyback Reference Voltage
Line Regulation
Flyback Amplifier
Transconductance (gm)
IFB = 50µA
3V ≤ VIN ≤ VMAX
∆lC = ±10µA
0.01
0.03
150
300
650
%/V
µmho
Flyback Amplifier Source
and Sink Current
BV
Output Switch Breakdown
Voltage
VSAT
Output Switch ON
Resistance (Note 2, 4)
Control Voltage to Switch
Current Transconductance
VC = 0.6V Source
IFB = 50µA Sink
3V ≤ VIN ≤ VMAX
ISW = 1.5mA
TJ ≤ 100°C
TJ ≤ 125°C
q
15
32
70
µA
q
25
40
70
µA
q
60
75
V
0.12
0.18
Ω
0.22
Ω
12
A/ V
LIM
Switch Current Limit (LT1270)
Duty Cycle = 50%, TJ ≤ 100°C
(Note 4)
Duty Cycle = 80%, TJ ≤ 100°C
q
8
q
6
16
A
14
A
1270afc
2
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