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UC1875N Arkusz danych(PDF) 9 Page - Texas Instruments

Numer części UC1875N
Szczegółowy opis  Phase Shift Resonant Controller
Download  19 Pages
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

UC1875N Arkusz danych(HTML) 9 Page - Texas Instruments

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UC1875/6/7/8
UC2875/6/7/8
UC3875/6/7/8
In each of the output stages, transistors Q3 through Q6
form a high-speed totem-pole driver which will source
or sink more than one amp peak with a total delay of
approximately 30 nanoseconds. To ensure a low output
level prior to turn-on, transistors Q7 through Q9 form a
self-biased driver to hold Q6 on prior to the supply
reaching its turn-on threshold. This circuit is operable
when the chip supply is zero. Q6 is also turned on and
held low with a signal from the fault logic portion of the
chip.
APPLICATION INFORMATION (cont.)
Delay Blocks And Output Stages
The delay providing the dead-time is accomplished with
C1 which must discharge to VTH before the output can
go high. The time is defined by the current sources, I1,
which is programmed by an external resistor, RTD. The
voltage on the Delay Set pins is internally regulated to
2.5V and the range of dead time control is
from 50 to 200 nanoseconds. NOTE: There is no way
to disable the delay circuitry, and the delay time must
be programmed.
The four outputs of the UC1875/6/7/8 interface to the full bridge converter switches as shown below:
Output Switch Orientation
UDG-95083
UDG-95082
3 Winding Bifilar, AWG 30 Kynar Insulation


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