Datasheet LT3797 (Analog Devices) - 5

LT3797
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, CTRL3, PWM1, PWM2, PWM3 = 2V; SENSEN1, SENSEN2, SENSEN3 = 0V, OVLO = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
SYNC Input High l 1.5 V SYNC Resistance to GND 200 kΩ
Logic Inputs/Outputs
EN/UVLO Threshold Voltage Falling l 1.180 1.220 1.255 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 l 1.5 2 2.6 µA EN/UVLO Pin Bias Current High EN/UVLO = 1.33V 40 100 nA OVLO Pin Input Bias Current 20 100 nA OVLO Threshold Voltage Rising l 1.225 1.250 1.280 V Hysteresis 125 mV PWM1, PWM2, PWM3 Input High Voltage l 1.1 1.4 V PWM1, PWM2, PWM3 Input Low Voltage l 0.6 0.9 V PWM1, PWM2, PWM3 Resistance to GND 200 kΩ FLT1, FLT2, FLT3 Output Low IFLT =1mA 300 mV SS1, SS2, SS3 Sourcing Current SS1, SS2, SS3 = 1V, Current Out of Pin 28 µA SS1, SS2, SS3 Sinking Current SS1, SS2, SS3 = 1V, OVLO =1.3V 2.8 µA SS1, SS2, SS3 Soft-Start Reset Threshold Falling, Measured on SS1, SS2, SS3 160 mV Hysteresis 30 mV SS1, SS2, SS3 Fault Reset Threshold Measured on SS1, SS2, SS3 1.7 V
NMOS Gate Drivers
GATE1, GATE2, GATE3 Output Rise Time (tr) CGATE = 3300pF (Note 5) 25 ns GATE1, GATE2, GATE3 Output Fall Time (tf) CGATE = 3300pF (Note 5) 25 ns Gate Output Low (VOL) 0.1 V Gate Output High (VOH) INTVCC V – 0.05
PMOS Gate Drivers
TG1, TG2, TG3 Turn-On Time CTG = 1000pF, ISP1, ISP2, ISP3, FBH1, FBH2, 200 ns FBH3 = 48V (Note 6) TG1, TG2, TG3 Turn-Off Time CTG = 1000pF, ISP1, ISP2, ISP3, FBH1, FBH2, 70 ns FBH3 = 48V (Note 6) PMOS Gate On Voltage ISP1, ISP2, ISP3, FBH1, FBH2, FBH3 = 48V 6.5 V (ISP1-TG1, ISP2-TG2, ISP3-TG3) PMOS Gate Off Voltage ISP1, ISP2, ISP3, FBH1, FBH2, FBH3 = 48V 0.3 V (ISP1-TG1, ISP2-TG2, ISP3-TG3)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings design, characterization and correlation with statistical process controls. may cause permanent damage to the device. Exposure to any Absolute The LT3797I is guaranteed over the full –40°C to 125°C operating junction Maximum Rating condition for extended periods may affect device temperature range. reliability and lifetime.
Note 4:
FBH(REG) denotes the regulation voltage (|ISP-FBH|) of the
Note 2:
Do not apply a positive or negative voltage or current source corresponding FBH pin. to SW1, SW2, GATE1, GATE2, GATE3, TG1, TG2, TG3 pins, otherwise
Note 5:
Rise and fall times are measured at 10% and 90% levels. permanent damage may occur.
Note 6:
Gate turn-on/turn-off time is measured from 50% level of PWM
Note 3:
The LT3797E is guaranteed to meet performance specifications voltage to 90% level of gate on/off voltage. from the 0°C to 125°C junction temperature. Specifications over the
Note 7:
The INTV –40°C to 125°C operating junction temperature range are assured by CC regulation voltage is tested in an open loop. Closed loop operation is guaranteed by design and process controls. Rev C For more information www.analog.com 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts