Datasheet

LT3796/LT3796-1
4
3796fa
For more information www.linear.com/3796
PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Sense Amplifier (CSA)
Power Supply Voltage Range (V
S
)
l
3 100 V
CSA Input Voltage Common Mode Range
(V
CSP
and V
CSN
)
l
2.5 100 V
CSOUT Maximum Output Current
l
200 µA
Input Voltage Offset (V
(CSP-CSN)
) V
SNS
= 100mV, V
S
= 48V (Note 5)
l
–3 0 3 mV
CSP, CSN Input Bias Current R
IN1
= R
IN2
= 1k (Note 5) 100 nA
CSP, CSN Input Current Offset R
IN1
= R
IN2
= 1k (Note 5) 0 nA
V
S
Supply Current V
S
= 48V 80 µA
Input Step Response ( to 50% of Output Step) ∆V
SENSE
= 100mV Step, R
IN1
= R
IN2
= 1k, R
OUT
= 5k 1 µs
Linear Regulator
INTV
CC
Regulation Voltage
l
7.4 7.7 8 V
Dropout (V
IN
–
INTV
CC
) I
INTVCC
= –10mA, V
IN
= 6V 400 mV
INTV
CC
Current Limit V
IN
= 100V, INTV
CC
= 6V
V
IN
= 12V, INTV
CC
= 6V
20
85
mA
mA
INTV
CC
Shutdown Bias Current if Externally
Driven to 7V
EN/UVLO = 0V, INTV
CC
= 7V 10 µA
INTV
CC
Undervoltage Lockout 3.8 4 4.1 V
INTV
CC
Undervoltage Lockout Hysteresis 150 mV
Oscillator
Switching Frequency R
T
= 82.5k
R
T
= 19.6k
R
T
= 6.65k
l
l
l
85
340
900
105
400
1000
125
480
1150
kHz
kHz
kHz
Minimum Off-Time (Note 6) 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 I
VIN
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 I
VMODE
= 0.5mA 300 mV
FAULT OUTPUT Low I
FAULT
= 0.5mA 300 mV
SYNC Pin Resistance to GND LT3796 Only 40 kΩ
SYNC Input Low Threshold LT3796 Only 0.4 V
SYNC Input High Threshold LT3796 Only 1.5 V
TGEN Pin Resistance to GND LT3796-1 Only 40 kΩ
TGEN Input Low Threshold LT3796-1 Only 0.4 V
TGEN Input High Threshold LT3796-1 Only 1.5 V
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 24V, EN/UVLO = 24V, CTRL = 2V, PWM = 5V, unless otherwise noted.