Datasheet
LM5116
SNVS499G –FEBRUARY 2007–REVISED MARCH 2013
www.ti.com
Electrical Characteristics (continued)
Limits in standard type are for T
J
= 25°C only; limits in boldface type apply over the junction temperature range of -40°C to
+125°C and are provided for reference only. Unless otherwise specified, the following conditions apply: VIN = 48V, VCC =
7.4V, VCCX = 0V, EN = 5V, R
T
= 16 kΩ, no load on LO and HO.
Symbol Parameter Conditions Min Typ Max Units
PWM Comparators
t
HO(OFF)
Forced HO Off-time 320 450 580 ns
t
ON(min)
Minimum HO On-time VIN = 80V, C
RAMP
= 50 pF 100 ns
Oscillator
f
SW1
Frequency 1 RT = 16 kΩ 180 200 220 kHz
f
SW2
Frequency 2 RT = 5 kΩ 480 535 590 kHz
RT output voltage 1.191 1.215 1.239 V
RT sync positive threshold 3.0 3.5 4.0 V
Current Limit
Cycle-by-cycle Sense Voltage Threshold
V
CS(TH)
VCCX = 0V, RAMP = 0V 94 110 126 mV
(CSG - CS)
Cycle-by-cycle Sense Voltage Threshold
V
CS(THX)
VCCX = 5V, RAMP = 0V 105 122 139 mV
(CSG - CS)
CS Bias Current CS = 100V -1 1 µA
CS Bias Current CS = 0V 90 125 µA
CSG Bias Current CSG = 0V 90 125 µA
R
T
= 16 kΩ, (200 kHz), (256
Current Limit Fault Timer 1.28 ms
clock cycles)
RAMP Generator
I
R1
RAMP Current 1 VIN = 60V, VOUT=10V 235 285 335 µA
I
R2
RAMP Current 2 VIN = 10V, VOUT = 10V 21 28 35 µA
VOUT Bias Current VOUT = 36V 200 µA
RAMP Output Low Voltage VIN = 60V, VOUT = 10V 265 mV
Diode Emulation
SW Zero Cross Threshold -6 mV
DEMB Output Current DEMB = 0V, SS = 1.25V 1.6 2.7 3.8 µA
DEMB Output Current DEMB =0V, SS = 2.8V 28 38 48 µA
DEMB = 0V, SS = Regulated
DEMB Output Current 45 65 85 µA
by FB
LO Gate Driver
V
OLL
LO Low-state Output Voltage I
LO
= 100 mA 0.08 0.17 V
I
LO
= -100 mA, V
OHL
= V
CC
-
V
OHL
LO High-state Output Voltage 0.25 V
V
LO
LO Rise Time C-load = 1000 pF 18 ns
LO Fall Time C-load = 1000 pF 12 ns
I
OHL
Peak LO Source Current V
LO
= 0V 1.8 A
I
OLL
Peak LO Sink Current V
LO
= VCC 3.5 A
HO Gate Driver
V
OLH
HO Low-state Output Voltage I
HO
= 100 mA 0.17 0.27 V
I
HO
= -100 mA, V
OHH
= V
HB
–
V
OHH
HO High-state Output Voltage 0.45 V
V
HO
HO Rise Time C-load = 1000 pF 19 ns
HO High-side Fall Time C-load = 1000 pF 13 ns
I
OHH
Peak HO Source Current V
HO
= 0V 1 A
I
OLH
Peak HO Sink Current V
HO
= VCC 2.2 A
HB to SW under-voltage 3 V
6 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM5116