SG3731 데이터 시트보기 (PDF) - Microsemi Corporation
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SG3731 Datasheet PDF : 5 Pages
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APPLICATION INFORMATION (continued)
the lower threshold causes Output B to switch to the HIGH state.
If±VS is less than±8V then ±VT can be obtained with resistors from
±VS. If ±VS is greater than ±8V use zeners.
Threshold crossings are generated by shifting the triangle
waveform up and down with the error voltage (Pin 5). A positive
error voltage will result in a pulse width modulated output at
Driver A (Pin 13). Similarly, a negative error voltage produces a
pulse train at Driver B (Pin 12). Figure 2 illustrates this process
for the case where V∆+ is greater than VT.
It is important to note that the triangle shifting circuit also
attenuates the waveform seen at CT by a factor of 2. This results
in a waveform at the PWM comparators with a positive peak of
V∆+ and a negative peak of V∆-, and must be taken into account
when selecting the values for +VT and -VT.
SG1731/SG2731/SG3731
APPLICATION CIRCUITS
FIGURE 2 - PULSE WIDTH MODULATION WITH NO DEADBAND
FIGURE 3
In this simple battery-powered position servo, the control supply
and driver supply are both single-ended positive with respect to
ground.
FIGURE 4
A high torque position servo is obtained by buffering the output
drivers to obtain higher output current.
4/90 Rev 1.3 9/99
Copyright 1999
LINFINITY Microelectronics Inc.
4
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
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