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STPM098C Datasheet(PDF) 84 Page - STMicroelectronics

Part # STPM098C
Description  Automotive dual digital 8-phase controller with PMBus™
PDF  110 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPM098C Datasheet(HTML) 84 Page - STMicroelectronics

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3.14.6.5
Pulse merging (MULTIPULSE)
In steady state condition the period imposed by the DCO for the single phase is always higher than the nominal
ON time.
Figure 68. T_on time, steady state
TON
TOFF
PWM
DVCO Pulse
In case the DCO output period is forced to be reduced below the nominal ON time, STPM098C allows to select
four different strategies for generating the ON/OFF timing through the MULTI_PULSE_STRAT register
configuration.
MULTI_PULSE_STRAT = 0x00
Pulse merger multiplies the ON time duration by the number of the DCO pulses received during the nominal ON
time. If a DCO pulse is received during the minimum TOFF window the next ON time is generated after a
minimum TOFF interval.
Figure 69. T_on time with MULTI_PULSE_STRAT = 0x00
MIN
TOFF
DVCO Pulse
PWM
Behavior during TON generation
Additional DVCO pulses generate
new TON at the end of previous one
Behavior during TOFF generation
New TON generated after
minimum TOFF
MULTI_PULSE_STRAT = 0x01
Pulse merger restarts the nominal ON time generation each time a DCO pulse is received during the nominal ON
time itself. If a DCO pulse is received during the minimum TOFF window the next ON time is generated after a
minimum TOFF interval.
Figure 70. T_on time with MULTI_PULSE_STRAT = 0x01
MIN
TOFF
DVCO Pulse
PWM
Behavior during TON generation
Additional DVCO pulses
immediately reset TON generation
Behavior during TOFF generation
New TON generated after
minimum TOFF
MULTI_PULSE_STRAT= 0x02
Pulse merger skips DCO pulses received during the nominal ON time itself. If a DCO pulse is received during the
minimum TOFF window the next ON time is generated after a minimum TOFF interval.
STPM098C
Functional description
DS14440 - Rev 1
page 84/110



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