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PDF LT1160CS Data sheet ( Hoja de datos )
| Número de pieza | LT1160CS | |
| Descripción | Half-/Full-Bridge N-Channel Power MOSFET Drivers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1160/LT1162
Half-/Full-Bridge
N-Channel
Power MOSFET Drivers
FEATURES
s Floating Top Driver Switches Up to 60V
s Drives Gate of Top N-Channel MOSFET
above Load HV Supply
s 180ns Transition Times Driving 10,000pF
s Adaptive Nonoverlapping Gate Drives Prevent
Shoot-Through
s Top Drive Protection at High Duty Cycles
s TTL/CMOS Input Levels
s Undervoltage Lockout with Hysteresis
s Operates at Supply Voltages from 10V to 15V
s Separate Top and Bottom Drive Pins
U
APPLICATIONS
s PWM of High Current Inductive Loads
s Half-Bridge and Full-Bridge Motor Control
s Synchronous Step-Down Switching Regulators
s 3-Phase Brushless Motor Drive
s High Current Transducer Drivers
s Class D Power Amplifiers
DESCRIPTION
The LT®1160/LT1162 are cost effective half-/full-bridge
N-channel power MOSFET drivers. The floating driver can
drive the topside N-channel power MOSFETs operating off
a high voltage (HV) rail of up to 60V.
The internal logic prevents the inputs from turning on the
power MOSFETs in a half-bridge at the same time. Its
unique adaptive protection against shoot-through cur-
rents eliminates all matching requirements for the two
MOSFETs. This greatly eases the design of high efficiency
motor control and switching regulator systems.
During low supply or start-up conditions, the undervoltage
lockout actively pulls the driver outputs low to prevent the
power MOSFETs from being partially turned on. The 0.5V
hysteresis allows reliable operation even with slowly vary-
ing supplies.
The LT1162 is a dual version of the LT1160 and is available
in a 24-pin PDIP or in a 24-pin SO Wide package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
12V
+ 10µF
25V
PWM
0Hz TO 100kHz
1N4148
1 SV+
10 PV+
4
UV OUT
14
BOOST
13
T GATE DR
12
T GATE FB
11
T SOURCE
LT1160
2
IN TOP
9
B GATE DR
38
IN BOTTOM B GATE FB
SGND
5
PGND
6
+ CBOOST
1µF
HV = 60V MAX
+
1000µF
100V
IRFZ44
IRFZ44
IN TOP IN BOTTOM T GATE DR B GATE DR
LL L L
LH L H
HL H L
HH L L
1160 TA01
1
1 page  
LT1160/LT1162
TYPICAL PERFORMANCE CHARACTERISTICS (LT1160 or 1/2 LT1162)
Bottom Gate Rise Time
vs Temperature
230
V+ = 12V
210
190 CLOAD = 10000pF
170
150
130
110
90 CLOAD = 3000pF
70
50
–50 –25
CLOAD = 1000pF
0 25 50 75 100 125
TEMPERATURE (°C)
1160/62 G10
Bottom Gate Fall Time
vs Temperature
210
V+ = 12V
190
170
150 CLOAD = 10000pF
130
110
90
70 CLOAD = 1000pF
50
CLOAD = 3000pF
30
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1160/62 G11
Top Gate Rise Time
vs Temperature
300
280 V+ = 12V
260
CLOAD = 10000pF
240
220
200
180
160 CLOAD = 3000pF
140
120
100 CLOAD = 1000pF
80
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1160/62 G12
Top Gate Fall Time
vs Temperature
180
V+ = 12V
160
CLOAD = 10000pF
140
120
100
80
CLOAD = 3000pF
60
40
20
–50 –25
CLOAD = 1000pF
0 25 50 75
TEMPERATURE (°C)
100 125
11160/62 G13
Turn-On Delay Time
vs Temperature
400
V+ = 12V
350 CLOAD = 3000pF
300
TOP DRIVER
250
200
BOTTOM DRIVER
150
100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1160/62 G14
Turn-Off Delay Time
vs Temperature
400
V+ = 12V
350 CLOAD = 3000pF
300 TOP DRIVER
250
BOTTOM DRIVER
200
150
100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1160/62 G15
Lockout Delay Time
vs Temperature
400
V+ = 12V
350 CLOAD = 3000pF
Release Delay Time
vs Temperature
400
V+ = 12V
350 CLOAD = 3000pF
300 TOP DRIVER
250 BOTTOM DRIVER
300
TOP DRIVER
250
200 200
BOTTOM DRIVER
150 150
100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1160/62 G16
100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1160/62 G17
5
5 Page 
APPLICATIONS INFORMATION
LT1160/LT1162
12V
REF PWM
OUT A
OUT A
BOOST
SV+ T GATE DR
PV+ T GATE FB
LT1160
T SOURCE
IN TOP B GATE DR
IN BOTTOM B GATE FB
RGS
HV
+
RSENSE
+
VOUT
1160 F02
Figure 2. Adding Synchronous Switching to a Step-Down Switching Regulator
Motor Drive Applications
In applications where rotation is always in the same
direction, a single LT1160 controlling a half-bridge can be
used to drive a DC motor. One end of the motor may be
connected either to supply or to ground as seen on Figure
3. A motor in this configuration is controlled by its inputs
which give three alternatives: run, free running stop (coast-
ing) and fast stop (“plugging” braking, with the motor
shorted by one of the MOSFETs).
To drive a DC motor in both directions the LT1162 can be
used to drive an H-bridge output stage. In this configura-
tion the motor can be made to run clockwise, counter-
clockwise, stop rapidly (“plugging” braking) or free run
(coast) to a stop. A very rapid stop may be achieved by
reversing the current, though this requires more careful
design to stop the motor dead. In practice a closed-loop
control system with tachometric feedback is usually
necessary.
The motor speed in these examples can be controlled by
switching the drivers with pulse width modulated square
waves. This approach is particularly suitable for micro-
computers/DSP control loops.
LT1160
SV+ BOOST
12V PV+ T GATE DR
T GATE FB
T SOURCE
IN TOP
B GATE DR
IN BOTTOM B GATE FB
PGND
+ HV
1160 F03
Figure 3. Driving a Supply Referenced Motor
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1160CS.PDF ] | |
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