Datasheet

LM25117
LM25117-Q1
SNVS714E –APRIL 2011–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. Typical values represent the most likely parametric norm at T
J
= 25°C, and are provided for reference purposes only.
Unless otherwise specified, the following conditions apply: V
VIN
= 24V, V
VCCDIS
= 0V, R
T
= 25kΩ, no load on LO & HO.
Symbol Parameter Test Conditions Min Typ Max Unit
V
CS(TH)
Cycle-by-cycle Sense Voltage V
RAMP
= 0, CSG to CS 106 120 135 mV
Threshold
CS Input Bias Current V
CS
= 0V -100 -66 µA
CSG Input Bias Current V
CSG
= 0V -100 -66 µA
Current Sense Amplifier Gain 10 V/V
Hiccup Mode Fault Timer 256 Cycles
RES
I
RES
RES Current Source 10 µA
V
RES
RES Threshold RES Rising 1.22 1.25 1.285 V
Diode Emulation
V
IL
DEMB Input Low Threshold 2.0 1.65 V
V
IH
DEMB Input High Threshold 2.95 2.5 V
SW Zero Cross Threshold -5 mV
DEMB Input Pull-down Resistance 50 kΩ
Current Monitor
Current Monitor Amplifier Gain CS to CM 17.5 20.5 23.5 V/V
Current Monitor Amplifier Gain Drift over Temperature -2 0 +2 %
Zero Input Offset 25 120 mV
HO Gate Driver
V
OHH
HO High-state Voltage Drop I
HO
= –100mA, V
OHH
= V
HB
- V
HO
0.17 0.3 V
V
OLH
HO Low-state Voltage Drop I
HO
= 100mA, V
OLH
= V
HO
- V
SW
0.1 0.2 V
HO Rise Time C-load = 1000pF
(2)
6 ns
HO Fall Time C-load = 1000pF
(2)
5 ns
I
OHH
Peak HO Source Current V
HO
= 0V, SW = 0V, HB = 7.6V 2.2 A
I
OLH
Peak HO Sink Current V
HO
= V
HB
= 7.6V 3.3 A
HB to SW Under-voltage 2.56 2.9 3.32 V
HB DC Bias Current HB - SW = 7.6V 65 100 µA
LO Gate Driver
V
OHL
LO High-state Voltage Drop I
LO
= –100mA, V
OHL
= V
CC
-V
LO
0.17 0.27 V
V
OLL
LO Low-state Voltage Drop I
LO
= 100mA, V
OLL
= V
LO
0.1 0.2 V
LO Rise Time C-load = 1000pF
(2)
6 ns
LO Fall Time C-load = 1000pF
(2)
5 ns
I
OHL
Peak LO Source Current V
LO
= 0V 2.5 A
I
OLL
Peak LO Sink Current V
LO
= 7.6V 3.3 A
Switching Characteristics
T
DLH
LO Fall to HO Rise Delay No load 72 ns
HO Fall to LO Rise Delay No load 71 ns
Thermal
T
SD
Thermal Shutdown Temperature Rising 165 °C
Thermal Shutdown Hysteresis 25 °C
θ
JA
Junction to Ambient HTSSOP-20 40 °C/W
θ
JC
Junction to Case HTSSOP-20 4 °C/W
θ
JA
Junction to Ambient WQFN-24 (4mmx4mm) 40 °C/W
θ
JC
Junction to Case WQFN-24 (4mmx4mm) 6 °C/W
(2) High and low reference are 80% and 20% of the pulse amplitude respectively.
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