LT3796 Просмотр технического описания (PDF) - Linear Technology
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LT3796
Linear Technology
LT3796 Datasheet PDF : 32 Pages
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LT3796
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, CTRL = 2V, PWM = 5V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Current Sense Amplifier (CSA)
Power Supply Voltage Range (VS)
CSA Input Voltage Common Mode Range
(VCSP and VCSN)
CSOUT Maximum Output Current
CSOUT = 10kΩ to GND
l
3
l
2.5
l
100
V
100
V
200
µA
Input Voltage Offset (V(CSP-CSN))
CSP, CSN Input Bias Current
CSP, CSN Input Current Offset
VSNS = 100mV, VS = 48V (Note 5)
VSNS = 0mV, RIN1 = RIN2 = 1k (Note 5)
VSNS = 0mV, RIN1 = RIN2 = 1k (Note 5)
l
–3
0
3
mV
100
nA
0
nA
VS Supply Current
VS = 48V
80
µA
Input Step Response ( to 50% of Output Step) ∆VSENSE = 100mV Step, RIN1 = RIN2 = 1k, ROUT = 10k
Linear Regulator
1
µs
INTVCC Regulation Voltage
Dropout (VIN– INTVCC)
IINTVCC = –20mA, VIN = 6V
l
7.4
7.7
8
V
400
mV
INTVCC Current Limit
INTVCC Shutdown Bias Current if Externally
Driven to 7V
VIN = 100V, INTVCC = 6V
VIN = 12V, INTVCC = 6V
EN/UVLO = 0V, INTVCC = 7V
20
mA
85
mA
10
µA
INTVCC Undervoltage Lockout
3.8
4
4.1
V
INTVCC Undervoltage Lockout Hysteresis
Oscillator
150
mV
Switching Frequency
Minimum Off-Time
RT = 82.5k
RT = 19.6k
RT = 6.65k
(Note 6)
l
85
l
340
l
900
105
125
kHz
400
480
kHz
1000
1150
kHz
190
ns
Minimum On-Time
(Note 6)
210
ns
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
1.250
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
40
200
nA
VMODE OUTPUT Low
FAULT OUTPUT Low
IVMODE = 0.5mA
IFAULT = 0.5mA
300
mV
300
mV
SYNC Pin Resistance to GND
40
kΩ
SYNC Input Low Threshold
0.4
V
SYNC Input High Threshold
1.5
V
3796f
4
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