UPD16837 查看數據表（PDF） - NEC => Renesas Technology
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UPD16837 Datasheet PDF : 16 Pages
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µPD16837
ABOUT SWITCHING
When output A is switched as shown in the figure on the right, a dead
time (time during which both P ch and N ch are OFF) elapses to prevent
through current. Therefore, the waveform of output A (rise time, fall time,
and delay time) changes depending on whether output B is fixed to the
high or low level.
The output voltage waveforms of A in response to an input waveform
where output B is fixed to the low level (1) or high level (2) are shown
below.
VM
Pch
Pch
A
B
Nch
Nch
(1) Output B: Fixed to low level
Output A: Switching operation (Operations of P ch and N ch are shown.)
Input waveform
Dead time
Pch: OFF→ OFF→ ON→
Nch: ON→ OFF→ OFF→
······ON······
······OFF······
Voltage waveform at point A
Current ON
Current OFF
OFF→ OFF→
OFF→ ON→
Output A goes into a high-impedance state and is in an undefined status during the dead time period. Because
output B is pulled down by the load, a low level is output to A.
(2) Output B: Fixed to high level
Output A: Switching operation (Operations of P ch and N ch are shown.)
Input waveform
Dead time
Pch: OFF→ OFF→ ON→
Nch: ON→ OFF→ OFF→
······ON······
······OFF······
OFF→ OFF→
OFF→ ON→
Voltage waveform at point A
Current ON
Current OFF
Output A goes into a high-impedance state and is in an undefined status during the dead time period. Because
output B is pulled up by the load, a high level is output to A.
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