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LT3752 Datasheet(PDF) 11 Page - Analog Devices

Part # LT3752
Description  Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller
PDF  52 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3752 Datasheet(HTML) 11 Page - Analog Devices

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LT3752/LT3752-1
11
Rev. C
For more information www.analog.com
LT3752-1: INTVCC UVLO Thresholds
vs Junction Temperature
SS1 Soft-Start/Soft-Stop Pin
Currents vs Junction Temperature
SS1 High, Active and Reset
Levels vs Junction Temperature
SS2 Soft-Start Charge Current
vs Junction Temperature
LT3752-1: INTVCC Regulation
Voltage vs Current, Junction
Temperature
TYPICAL PERFORMANCE CHARACTERISTICS T
A = 25°C, unless otherwise noted.
JUNCTION TEMPERATURE (°C)
–75
10.00
9.95
9.90
9.85
9.80
9.65
9.75
9.70
9.40
9.60
9.55
9.50
9.45
25
150
–25
100
3752 G18
175
0
125
–50
50 75
ILOAD = 0mA
ILOAD = 10mA
ILOAD = 20mA
ILOAD = 30mA
VIN = 12V
JUNCTION TEMPERATURE (°C)
–75
25
24
23
16
22
21
20
19
18
17
15
25
150
–25
100
3752 G21
175
0
125
–50
50 75
SS2 PIN CURRENT* (–1)
JUNCTION TEMPERATURE (°C)
–75
14.0
13.5
13.0
12.5
8.5
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.0
25
150
–25
100
3752 G19
175
0
125
–50
50 75
SS1 SOFT-START: CHARGE CURRENT* (–1)
SS1 SOFT-STOP: DISCHARGE CURRENT
JUNCTION TEMPERATURE (°C)
–75
3.00
2.75
2.50
2.25
0.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0
25
150
–25
100
3752 G20
175
0
125
–50
50 75
SS1 ACTIVE LEVEL
(ALLOW FORWARD CONVERTER SWITCHING)
SS1 HIGH LEVEL
SS1 RESET LEVEL (RESET SS1 LATCH)
Switching Frequency
vs SS1 Pin Voltage
Switching Frequency
vs Junction Temperature
JUNCTION TEMPERATURE (°C)
–75
325
320
315
280
310
305
300
295
290
285
275
25
150
–25
100
3752 G23
175
0
125
–50
50 75
RT = 24.9k
FB Reference Voltage
vs Junction Temperature
JUNCTION TEMPERATURE (°C)
–75
1.30
1.29
1.28
1.21
1.27
1.26
1.25
1.24
1.23
1.22
1.20
25
150
–25
100
3752 G24
175
0
125
–50
50 75
JUNCTION TEMPERATURE (°C)
–75
7.20
7.15
7.10
7.05
6.65
7.00
6.95
6.90
6.85
6.80
6.75
6.70
6.60
25
150
–25
100
3752 G17
175
0
125
–50
50 75
INTVCC < UVLO (–): DISABLE FORWARD
CONVERTER SWITCHING
INTVCC > UVLO (+): ENABLE FORWARD
CONVERTER SWITCHING
SS1 (V)
0
350
325
300
275
25
250
225
200
175
150
100
75
125
50
0
1
2.25 2.5
0.5
1.75
3752 G22
2.75
0.75
2
0.25
1.25 1.5
RT = 24.9k
LT3752-1
f(HOUT)
f(OUT)
f(HOUT)LT3752-1
f(HOUT)LT3752
f(OUT)
LT3752
f(HOUT)
f(OUT)



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