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LT1952 データシート(PDF) 3 Page - Linear Technology

部品番号 LT1952
部品情報  Synchronous No-Opto Flyback Controller
PDF  42 Pages
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LT1952 データシート(HTML) 3 Page - Linear Technology

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LTC4278
3
4278fc
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Interface Controller (Note 4)
Operating Input Voltage
Signature Range
Classification Range
ON Voltage
OFF Voltage
Overvoltage Lockout
At VPORTP (Note 5)
l
l
l
l
1.5
12.5
30.0
71
60
9.8
21
37.2
V
V
V
V
V
V
ON/OFF Hysteresis Window
l
4.1
V
Signature/Class Hysteresis Window
l
1.4
V
Reset Threshold
State Machine Reset for 2-Event Classification
l
2.57
5.40
V
Supply Current
Supply Current at 57V
Measured at VPORTP Pin
l
1.35
mA
Class 0 Current
VPORTP = 17.5V, No RCLASS Resistor
l
0.40
mA
Signature
Signature Resistance
1.5V ≤ VPORTP ≤ 9.8V (Note 6)
l
23.25
26
kΩ
Invalid Signature Resistance, SHDN Invoked 1.5V ≤ VPORTP ≤ 9.8V, VSHDN = 3V (Note 6)
l
11
kΩ
Invalid Signature Resistance During Mark
Event
(Notes 6, 7)
l
11
kΩ
Classification
Class Accuracy
10mA < ICLASS < 40mA, 12.5V < VPORTP < 21V
(Notes 8, 9)
l
±3.5
%
Classification Stability Time
VPORTP Pin Step to 17.5V, RCLASS = 30.9, ICLASS Within 3.5%
of Ideal Value (Notes 8, 9)
l
1
ms
Normal Operation
Inrush Current
VPORTP = 54V, VNEG = 3V
l
60
100
180
mA
Power FET On-Resistance
Tested at 600mA into VNEG, VPORTP = 54V
l
0.7
1.0
Ω
Power FET Leakage Current at VNEG
VPORTP = SHDN = VNEG = 57V
l
1
µA
Digital Interface
SHDN Input High Level Voltage
l
3
V
SHDN Input Low Level Voltage
l
0.45
V
SHDN Input Resistance
VPORTP = 9.8V, SHDN = 9.65V
l
100
kΩ
PWRGD, T2P Output Low Voltage
Tested at 1mA, VPORTP = 54V. For T2P, Must Complete
2-Event Classification to See Active Low
l
0.15
V
PWRGD, T2P Leakage Current
Pin Voltage Pulled 57V, VPORTP = VPORTN = 0V
l
1
µA
PWRGD Output Low Voltage
Tested at 0.5mA, VPORTP = 52V, VNEG = 48V, Output Voltage
Is With Respect to VNEG
l
0.4
V
PWRGD Clamp Voltage
Tested at 2mA, VNEG = 0V, Voltage With Respect to VNEG
l
12
16.5
V
PWRGD Leakage Current
VPWRGD = 11V, VNEG = 0V, Voltage With Respect to VNEG
l
1
µA



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