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UC3717A Folha de dados(PDF) 4 Page - Texas Instruments

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Nome de Peças UC3717A
Descrição Electrónicos  Stepper Motor Drive Circuit
Download  9 Pages
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Fabricante Electrônico  TI [Texas Instruments]
Página de início  http://www.ti.com
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UC3717A Folha de dados(HTML) 4 Page - Texas Instruments

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The UC3717A’s drive circuit shown in the block diagram
includes the following components.
(1) H-bridge output stage
(2) Phase polarity logic
(3) Voltage divider coupled with current sensing compa-
rators
(4) Two-bit D/A current level select
(5) Monostable generating fixed off-time
(6) Thermal protection
OUTPUT STAGE
The UC3717A’s output stage consists of four Darlington
power transistors and associated recirculating power di-
odes in a full H-bridge configuration as shown in Figure
7. Also presented, is the new added feature of inte-
grated bootstrap pull up, which improves device per-
formance during switched mode operation. While in
switched mode, with a low level phase polarity input, Q2
is on and Q3 is being switched. At the moment Q3 turns
off, winding current begins to decay through the commu-
tating diode pulling the collector of Q3 above the supply
voltage. Meanwhile, Q6 turns on pulling the base of Q2
higher than its previous value. The net effect lowers the
saturation voltage of source transistor Q2 during recircu-
lation, thus improving efficiency by reducing power dissi-
pation.
UC3717A
Figure 6. UC3717A Test Circuit
Figure 7. Simplified Schematic of Output Stage
Note: Dashed lines indicate current decay paths.
FUNCTIONAL DESCRIPTION
4


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