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LT1270ACT 数据表(PDF) 2 Page - Linear Technology

部件名 LT1270ACT
功能描述  8A and 10A High Efficiency Switching Regulators
PDF  4 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1270ACT 数据表(HTML) 2 Page - Linear Technology

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



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