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PDF AN603 Data sheet ( Hoja de datos )
| Número de pieza | AN603 | |
| Descripción | Designing With the Si9978DW Configurable H-Bridge Controller | |
| Fabricantes | Vishay Siliconix | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AN603 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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AN603
Vishay Siliconix
Designing With the Si9978DW Configurable H-Bridge Controller
Wharton McDaniel
Currently, there are a number of fully integrated H-bridges on
the market. Both bipolar and MOS technologies have been
used to create these parts. However, all of them suffer from
problems such as limited current handling capability, large
package size, and difficulty of assembly. The Si9978DW
addresses these problems with an architecture that allows
flexible current handling capability, small size, and ease of
assembly. Instead of trying to integrate the power devices with
the controller on a single piece of silicon, the Si9978DW
approach is to separate the controller from the MOSFETs. The
benefit is efficient manufacture of both the controller and the
MOSFETs, the flexibility to select the optimum MOSFET for the
application, and the ability to use surface-mount parts for both
the controller and MOSFETs which makes assembly easier.
Altogether this means a low cost H-bridge solution.
The Si9978DW is a monolithic controller designed to be used
with LITTLE FOOTR power MOSFETs to create an
all-n-channel H-bridge or two separate half bridges. In addition
to this functional flexibility, the dual function allows
standardization of components and reduces inventory costs.
The Si9978DW features integral high-side drive circuitry and
an internal voltage regulator, which allows operation over a 20-
to 40-V dc input voltage range. Protection features include
cross-conduction protection, current limiting, and undervoltage
lockout. The FAULT outputs indicate when undervoltage or
overcurrent shutdown has occurred. The Si9978DW is
packaged in a 24-pin wide body SOIC.
CONTROL LOGIC
The Si9978 has two modes of operation, full H-bridge, and
independent half-bridge. The mode of operation determines
the function of the input pins and the FAULT outputs. With the
MODE pin at logic 1, which is the default condition, the Si9978
functions as a full H-bridge. With the MODE pin at logic 0, the
Si9978DW functions as two independent half-bridges. The
definitions of the control inputs depend on the mode of
operation. All control inputs are pulled up to VDD. The FAULT
outputs are open drain. Truth Tables have been provided for
each mode of operation.
V+ 24
www.DataSheet4U.com
VDD
1
DIR/INA
QS/INB
PWM/ENB
MODE
BRK
EN/ENA
CL/FAULTB
FAULT/FAULTA
RA/CA
3
5
4
6
7
2
8
9
11
RB/CB
12
Low-Voltage
Regulator
VDD
Low-Side
U.V. Lockout
VDD
VDD
VDD
VDD
VDD
VDD
CAPA
CAPB
High-Side
U.V. Lockout
Input
Logic
One Shot
One Shot
Bootstrap Reg.
Charge Pump
Bootstrap Reg.
Charge Pump
VDD
VDD
23 CAPA
21 GTA
22
SA
19 CAPB
17 GTB
18
SB
20 GBA
16 GBB
15
GND
–
+ 13 ILA+
–
+ 14 ILB+
FIGURE 1. The Si9978 is made up of the control logic, the gate drive outputs, VDD regulator, and protection circuitry.
Document Number: 70574
08-Jun-00
www.vishay.com S FaxBack 408-970-5600
1
1 page  
AN603
Vishay Siliconix
V+
C1
EN
DIR
PWM
QS
BRK
CL
FAULT
R4 R3
VCC
R2
100 kW
C2 C3
U1
1
VDD
2
EN/ENA
3
DIR/INA
4
PWM/ENB
5
QS/INB
6
MODE
7
BRK
8
CL/FB
9
F/FA
10
NC
11
RA/CA
12
RB/CB
V+
CAPA
SA
GTA
GBA
CAPB
SB
GTB
GBB
GND
ILB+
ILA+
24
23
22
21
20
19
18
17
16
15
14
13
Si9978DW
C4
C5
Q1
Q2
GND
C8
FIGURE 4. Basic H-Bridge Circuits
LITTLE FOOTR
C6 C7
AB
OUT OUT
R1
Q3
Q4
Decoupling Capacitors - Care must be taken in the placement
and connection of the decoupling capacitors. The capacitor
www.DsahtoauSlhdebeet4pUla.ccoemd physically close to the device being decoupled.
The connections should be direct and as short as possible. When
decoupling a pin on an integrated circuit, connect the capacitor
directly from the pin being decoupled to the ground pin of the IC.
When decoupling a MOSFET half-bridge, connect the capacitor
directly from the drain of the high-side MOSFET to the Source of
the low-side MOSFET.
Power and Ground Traces - The traces carrying the motor
current should be kept separate from the power traces of
devices carrying signal level currents. This will minimize noise
due to the high level currents drawn by a motor load. Do not
use power or ground plane for this purpose. Also, make certain
that these traces are made wide enough to minimize the
voltage drop created by the motor current.
Heat Transfer and LITTLE FOOT - Surface mount power
MOSFETs rely on the PC board to serve as a heat sink. Wide
traces should be connected to the Drain pins of the power
MOSFETs to draw heat away from their packages and transfer
the heat into the PC board. These traces should be at least 0.1”
wide.
Component Placement
Document Number: 70574
08-Jun-00
Top Copper
FIGURE 5.
Bottom Copper
www.vishay.com S FaxBack 408-970-5600
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AN603.PDF ] | |
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