LT3795 Просмотр технического описания (PDF) - Linear Dimensions Semiconductor
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LT3795 Datasheet PDF : 28 Pages
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LT3795
Electrical Characteristics The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C, VIN = 24V, EN/UVLO = 24V, CTRL1 = CTRL2 = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Linear Regulator
INTVCC Regulation Voltage
Dropout (VIN-INTVCC)
INTVCC Current Limit
INTVCC Shutdown Bias Current if Externally
Driven to 7V
IINTVCC = –10mA, VIN = 4.5V
VIN = 110V, INTVCC = 6V
VIN = 12V, INTVCC = 6V
EN/UVLO = 0V, INTVCC = 7V
l
7.4
7.7
8
V
550
mV
18
mA
85
mA
13
17
µA
INTVCC Undervoltage Lockout
INTVCC Undervoltage Lockout Hysteresis
3.8
4
4.1
V
200
mV
Oscillator
Switching Frequency
RT = 82.5k
RT = 19.6k
RT = 6.65k
l
85
l
340
l
900
105
125
kHz
400
480
kHz
1000
1150
kHz
Minimum Off-Time
(Note 5)
160
ns
Minimum On-Time
(Note 5)
210
ns
Switching Frequency Modulation
RAMP Input Low Threshold
VRAMP = 2V
70
%
1
V
RAMP Input High Threshold
2
V
RAMP Pin Source Current
RAMP = 0.4V
12
µA
RAMP Pin Sink Current
RAMP = 1.6V
12
µA
LOGIC Input/Outputs
PWM Input Threshold Rising
l 0.96
1
1.04
V
PWM Pin Bias Current
10
µA
EN/UVLO Threshold Voltage Falling
l 1.185
1.220
1.25
V
EN/UVLO Rising Hysteresis
20
mV
EN/UVLO Input Low Voltage
IVIN Drops Below 1µA
0.4
V
EN/UVLO Pin Bias Current Low
EN/UVLO = 1.15V
2.5
3
3.8
µA
EN/UVLO Pin Bias Current High
EN/UVLO = 1.30V
10
100
nA
OPENLED OUTPUT Low
SHORTLED OUTPUT Low
OVLO Threshold Voltage Rising
IOPENLED = 0.5mA
ISHORTLED = 0.5mA
300
mV
300
mV
l 1.215
1.25
1.28
V
OVLO Falling Hysteresis
28
mV
OVLO Pin Input Current
150
nA
Gate Driver
tr NMOS GATE Driver Output Rise Time
tf NMOS GATE Driver Output Fall Time
NMOS GATE Output Low (VOL)
CL = 3300pF, 10% to 90%
CL = 3300pF, 10% to 90%
20
ns
18
ns
0.05
V
NMOS GATE Output High (VOH)
INTVCC –
V
0.05
tr Top GATE Driver Output Rise Time
CL = 300pF
50
ns
tf Top GATE Driver Output Fall Time
Top Gate On Voltage (VISP-VTG)
Top Gate Off Voltage (VISP-VTG)
CL = 300pF
ISP = 48V
PWM = 0V, ISP = 48V
100
ns
7
8
V
0
0.3
V
3795f
4
For more information www.linear.com/LT3795
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