lt1336cs-trpbf Linear Technology Corporation, lt1336cs-trpbf Datasheet - Page 14

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lt1336cs-trpbf

Manufacturer Part Number
lt1336cs-trpbf
Description
Half-bridge N-channel Power Mosfet Driver With Boost Regulator
Manufacturer
Linear Technology Corporation
Datasheet
APPLICATIONS
LT1336
most power supplies cannot sink current, this current can
raise the voltage of the high voltage rail. This can be
avoided by placing a discharge resistor between HV sup-
ply and ground to divert the return current to ground as
shown in Figure 5. For a high voltage rail of 40V, a 26k
resistor or smaller should be used, since the top driver will
return about 1.5mA.
For applications where using a discharge resistor is unde-
sirable, use the flyback regulator topology instead of the
boost regulator topology (see Deriving the Floating Supply
with the Flyback Topology).
To drive a DC motor in both directions, two LT1336s can
be used to drive an H-bridge output stage. In this configu-
ration 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.
TYPICAL APPLICATIONS
14
SHUTDOWN
0.022µF
4.7k
1µF
510Ω
+
C1
0.1µF
360Ω
2k
** MAGNETICS CORE #55585-A2 30 TURNS 14GA MAGNET WIRE
* SUMIDA RCR-664D-221KC
DALE TYPE LVR-3 ULTRONIX RCS01
0.33µF
0.1µF
0.1µF
27k
U
Figure 6. 90% Efficiency, 40V to 5V, 10A, Low Dropout Voltage Mode Switching Regulator
1
2
3
4
5
6
7
8
9
f = 25kHz
LT3526
INFORMATION
4.7k
U
18
17
16
15
14
13
12
11
10
U
1N4148
1N4148
W
+
2.2nF
1µF
1k
5k
+
2N2222
U
1k
2Ω, 1/4W
10µF
R
SENSE
1
2
3
4
5
6
7
8
I
SV
INTOP
INBOTTOM
UVOUT
SGND
PGND
BGATEFB
SENSE
+
+
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.
LT1336
200µH
10µF
L1*
R
2Ω
1/4W
SENSE
TGATEDR
TSOURCE
BGATEDR
TGATEFB
SWITCH
SWGND
BOOST
Figure 5. Driving a Supply Referenced Motor
PV
V
V
I
SENSE
+
+
+
LT1336
16
15
14
13
12
11
10
9
1N4148
D1
1N4148
+
IRFZ44
200µH*
TSOURCE
BGATEDR
TGATEDR
TGATEFB
BGATEFB
SWITCH
BOOST
1µF
PGND
1N4148
IRFZ44
330k
+
V
BOOST
IRFZ44
+
+
70µH
L2**
MBR340
D2
1N4148
C
1µF
+
BOOST
2200µF EA
LOW ESR
12V
0.007Ω
40V
R
HV = 40V MAX
S
+
*SUMIDA
RCR-664D-221KC
+
sn1336 1336fs
sn1336 1336fs
1336 F06
5400µF
LOW
ESR
R
24k
DISCHRG
5V
1336 F05

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