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AN603
TURBOSWITCH IN A PFC BOOST CONVERTER
AN603
Vishay Siliconix
Designing With the Si9978DW Configurable H-Bridge ControllerWharton 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 FOOT 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.
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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.
DIR/INA
QS/INB
MODE
BRK
FAULT/FAULTA
CL/FAULTB
GTA ILA+
PWM/ENB
EN/ENA
RA/CA
VDD ILB+RB/CB
GTB
CAPA
CAPB
GBA
GBB GND
