Datasheet

LM5115
www.ti.com SNVS343E –MARCH 2005–REVISED MARCH 2013
Electrical Characteristics (continued)
Unless otherwise specified, T
J
= –40°C to +125°C, VBIAS = 12V, No Load on LO or HO.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
FB Input Bias Current FB = 2V 0.2 0.5 µA
COMP Source Current 300 µA
Open Loop Voltage Gain 60 dB
GBW Gain Bandwidth Product 4 MHz
Vio Input Offset Voltage -7 0 7 mV
COMP Offset Threshold for V
HO
= high RAMP = CS = 2 V
VOUT = 0V
RAMP Offset Threshold for V
HO
= high COMP = 1.5V, 1.1 V
CS = VOUT = 0V
CURRENT SENSE AMPLIFIER
Current Sense Amplifier Gain 16 V/V
Output DC Offset 1.27 V
Amplifier Bandwidth 500 kHz
CURRENT LIMIT
ILIMIT Amp Transconductance 16 mA / V
Overall Transconductance 237 mA / V
Positive Current Limit V
CL
= V
CS
- V
VOUT
37 45 53 mV
VOUT = 6V and CO/COMP = 1.5V
Positive Current Limit Foldback V
CL
= V
CS
- V
VOUT
31 38 45 mV
VOUT = 0V and CO/COMP = 1.5V
VCLneg Negative Current Limit VOUT = 6V -17 mV
V
CL
= V
CS
- V
VOUT
to cause LO to
shutoff
RAMP GENERATOR
SYNC Input Impedance 2.5 kΩ
SYNC Threshold End of cycle detection threshold 15 µA
Free Run Mode Peak Threshold RAMP peak voltage with dc current 2.3 V
applied to SYNC.
Current Mirror Gain Ratio of RAMP charge current to SYNC 2.7 3.3 A/A
input current.
Discharge Impedance 100 Ω
LOW SIDE GATE DRIVER
V
OLL
LO Low-state Output Voltage I
LO
= 100mA 0.2 0.5 V
V
OHL
LO High-state Output Voltage I
LO
= -100mA, V
OHL
= V
CC
-V
LO
0.4 0.8 V
LO Rise Time C
LOAD
= 1000pF 15 ns
LO Fall Time C
LOAD
= 1000pF 12 ns
I
OHL
Peak LO Source Current V
LO
= 0V 2 A
I
OLL
Peak LO Sink Current V
LO
= 12V 2.5 A
HIGH SIDE GATE DRIVER
V
OLH
HO Low-state Output Voltage I
HO
= 100mA 0.2 0.5 V
V
OHH
HO High-state Output Voltage I
HO
= -100mA, V
OHH
= V
HB
–V
HO
0.4 0.8 V
HO Rise Time C
LOAD
= 1000pF 15 ns
HO High Side Fall Time C
LOAD
= 1000pF 12 ns
I
OHH
Peak HO Source Current V
HO
= 0V 2 A
I
OLH
Peak HO Sink Current V
HO
= 12V 2.5 A
SWITCHING CHARACTERISITCS
LO Fall to HO Rise Delay C
LOAD
= 0 70 ns
HO Fall to LO Rise Delay C
LOAD
= 0 50 ns
SYNC Fall to HO Fall Delay C
LOAD
= 0 120 ns
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