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LT3752 Datasheet(PDF) 5 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) 5 Page - Analog Devices

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LT3752/LT3752-1
5
Rev. C
For more information www.analog.com
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, UVLO_VSEC = 2.5V.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
OVLO Hysteresis
l
23
35
47
mV
OVLO Pin Current (Note 10)
OVLO = 0V
OVLO = 1.5V (SS1 = 2.7V)
OVLO = 1.5V (SS1 = 1.0V)
5
0.9
5
100
100
nA
mA
nA
Oscillator (Forward Controller: OUT, SOUT, AOUT)
Frequency: fOSC = 100kHz
RT = 82.5k
94
100
106
kHz
Frequency: fOSC = 300kHz
RT = 24.9k
l
279
300
321
kHz
Frequency: fOSC = 500kHz
RT = 14k
470
500
530
kHz
fOSC Line Regulation
RT = 24.9k
6.5V < VIN < 100V (LT3752)
10.5V < VIN < 16V (LT3752-1)
0.05
0.05
0.1
0.1
%/V
%/V
Frequency and DVSEC Foldback Ratio (LT3752) (Fold) SS1 = VSSACT + 25mV, SS2 = 2.7V
4
Frequency and DVSEC Foldback Ratio (LT3752-1) (Fold) SS1 = VSS1ACT + 25mV, SS2 = 2.7V
2
SYNC Input High Threshold
(Note 4)
l
1.2
1.8
V
SYNC Input Low Threshold
(Note 4)
l
0.6
1.025
V
SYNC Pin Current
SYNC = 6V
75
µA
SYNC Frequency/Programmed fOSC
1.0
1.25
kHz/kHz
Linear Regulator (INTVCC) (LT3752)
INTVCC Regulation Voltage
6.6
7
7.2
V
Dropout (VIN-INTVCC)
VIN = 6.5V, IINTVCC = 10mA
0.8
V
INTVCC UVLO(+)
(Start Switching)
4.75
5
V
INTVCC UVLO(–)
(Stop Switching)
4.6
4.85
V
INTVCC UVLO Hysteresis
0.075
0.15
0.24
V
Linear Regulator (INTVCC) (LT3752-1)
INTVCC Regulation Voltage
9.4
10
10.4
V
Dropout (VIN-INTVCC)
VIN = 8.75V, IINTVCC = 10mA
0.6
V
INTVCC UVLO(+)
(Start Switching)
7
7.4
V
INTVCC UVLO(–)
(Stop Switching)
6.8
7.2
V
INTVCC UVLO Hysteresis
0.1
0.2
0.3
V
Linear Regulator (INTVCC) (LT3752/LT3752-1)
INTVCC OVLO(+)
(Stop Switching)
15.9
16.5
17.2
V
INTVCC OVLO(–)
(Start Switching)
15.4
16
16.7
V
INTVCC OVLO Hysteresis
0.38
0.5
0.67
V
INTVCC Current Limit
INTVCC = 0V
INTVCC = 5.75V (LT3752)
INTVCC = 8.75V (LT3752-1)
l
l
17
35
35
23
50
50
29
60
60
mA
mA
mA
Error Amplifier
FB Reference Voltage
l
1.220
1.250
1.275
V
FB Line Reg
6.5V < VIN < 100V (LT3752)
10.5V < VIN < 16V (LT3752-1)
0.1
0.1
0.3
0.3
mV/V
mV/V
FB Load Reg
COMP_SW – 0.1V < COMP < COMP_VOH – 0.1V
0.1
0.3
mV/V
FB Input Bias Current
(Note 10)
50
200
nA
Open-Loop Voltage Gain
85
dB
Unity-Gain Bandwidth
(Note 8)
2.5
MHz
COMP Source Current
FB = 1V, COMP = 1.75V (Note 10)
6
11
mA



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