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LT1249CS8 데이터시트(PDF) 5 Page - Linear Technology

부품명 LT1249CS8
상세설명  Power Factor Controller
PDF  12 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LT1249CS8 데이터시트(HTML) 5 Page - Linear Technology

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LT1249
5
PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (
°C)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1249 G11
75
–25
25
125
–50
0
50
100
Synchronization Threshold
at CAOUT
Voltage Amp Sink Current Limits
(Threshold)
MOUT VOLTAGE (V)
–2.4
–1.2
0
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
1249 G12
1.2
2.4
125
°C
25
°C
–50
°C
MOUT Pin Characteristics
TEMPERATURE (
°C)
1249 G15
–1.30
–1.25
–1.20
–1.15
–1.10
–1.05
–1.00
–0.95
–0.90
–75
–25
–50
25
0
50
100
75
125
Maximum Multiplier Output
Voltage (IM(MAX) • RMOUT)
Transconductance of Current
Amplifier Over Temperature
TEMPERATURE (
°C)
–50
100
1249 G13
050
400
350
300
250
200
150
100
50
0
–25
25
75
125
Maximum Duty Cycle
TEMPERATURE (
°C)
100
99
98
97
96
95
94
93
92
91
90
1249 G16
75
–25
25
125
–50
0
50
100
TEMPERATURE (
°C)
–75
–25
–50
25
0
50
100
75
125
1249 G14
60
50
40
30
20
10
0
UP THRESHOLD
DOWN THRESHOLD
NOTE: THESE SINK CURRENT THRESHOLDS ARE
FOR OVERVOLTAGE PROTECTION FUNCTION.
GND (Pin 1): Ground.
CAOUT (Pin 2): This is the output of the current amplifier
that senses and forces the line current to follow the
reference signal that comes from the multiplier by com-
manding the pulse width modulator. When CAOUT is low,
the modulator has zero duty cycle.
MOUT (Pin 3): The multiplier current goes out of this pin
through the 4k resistor RMOUT. The voltage developed
across RMOUT is the reference voltage of the current loop
and it is limited to 1.1V. The noninverting input of the
current amplifier is also tied to RMOUT. In operation, MOUT
is normally at negative potential and only AC signals
appear at the noninverting input of the current amplifier.
IAC (Pin 4): This is the AC line voltage sensing input to the
multiplier. It is a current input that is biased at 2V to
minimize the crossover dead zone caused by low line
voltage. A 32k resistor is in series with the current input,
so that a small external capacitor can be used to filter out
the switching noise from the high impedance lines.
VAOUT (Pin 5): This is the output of the voltage error
amplifier. The output is clamped at 12V. When the output
goes below 1.5V, the multiplier output current is zero.



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