Datasheet

LMD18245
www.ti.com SNVS110E –APRIL 1998–REVISED APRIL 2013
Electrical Characteristics
(1)
The following specifications apply for V
CC
= +42V, unless otherwise stated. Boldface limits apply over the operating
temperature range, −40°C ≤ T
J
≤ +125°C. All other limits apply for T
A
= T
J
= 25°C.
Typical
(2)
Limit
(2)
Units
Symbol Parameter Conditions
(Limits)
I
CC
Quiescent Supply Current DAC REF = 0V, V
CC
= +20V 8 mA
15 mA (max)
POWER OUTPUT STAGE
R
DS(ON)
Switch ON Resistance I
LOAD
= 3A 0.3 0.4 Ω (max)
0.6 Ω (max)
I
LOAD
= 6A 0.3 0.4 Ω (max)
0.6 Ω (max)
V
DIODE
Body Diode Forward Voltage I
DIODE
= 3A 1.0 V
1.5 V(max)
T
rr
Diode Reverse Recovery Time I
DIODE
= 1A 80 ns
Q
rr
Diode Reverse Recovery Charge I
DIODE
= 1A 40 nC
t
D(ON)
Output Turn ON Delay Time
Sourcing Outputs I
LOAD
= 3A 5 μs
Sinking Outputs I
LOAD
= 3A 900 ns
t
D(OFF)
Output Turn OFF Delay Time
Sourcing Outputs I
LOAD
= 3A 600 ns
Sinking Outputs I
LOAD
= 3A 400 ns
t
ON
Output Turn ON Switching Time
Sourcing Outputs I
LOAD
= 3A 40 μs
Sinking Outputs I
LOAD
= 3A 1 μs
t
OFF
Output Turn OFF Switching Time
Sourcing Outputs I
LOAD
= 3A 200 ns
Sinking Outputs I
LOAD
= 3A 80 ns
t
pw
Minimum Input Pulse Width Pins 10 and 11 2 μs
t
DB
Minimum Dead Band
(3)
40 ns
CURRENT SENSE AMPLIFIER
Current Sense Output I
LOAD
= 1A
(4)
200 μA (min)
250 175 μA (min)
300 μA (max)
325 μA (max)
Current Sense Linearity Error 0.5A ≤ I
LOAD
≤ 3A
(4)
±6 %
±9 %(max)
Current Sense Offset I
LOAD
= 0A 5 μA
20 μA (max)
(1) Unless otherwise stated, load currents are pulses with widths less than 2 ms and duty cycles less than 5%.
(2) All limits are 100% production tested at 25°C. Temperature extreme limits are ensured via correlation using accepted SQC (Statistical
Quality Control) methods. All limits are used to calculate AOQL (Average Outgoing Quality Level). Typicals are at T
J
= 25°C and
represent the most likely parametric norm.
(3) Asymmetric turn OFF and ON delay times and switching times ensure a switch turns OFF before the other switch in the same half H-
bridge begins to turn ON (preventing momentary short circuits between the power supply and ground). The transitional period during
which both switches are OFF is commonly referred to as the dead band.
(4) (I
LOAD
, I
SENSE
) data points are taken for load currents of 0.5A, 1A, 2A and 3A. The current sense gain is specified as I
SENSE
/I
LOAD
for the
1A data point. The current sense linearity is specified as the slope of the line between the 0.5A and 1A data points minus the slope of
the line between the 2A and 3A data points all divided by the slope of the line between the 0.5A and 1A data points.
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