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STPM098C 데이터시트(PDF) 91 Page - STMicroelectronics

부품명 STPM098C
상세설명  Automotive dual digital 8-phase controller with PMBus™
PDF  110 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STPM098C 데이터시트(HTML) 91 Page - STMicroelectronics

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Table 72. ZC offset2 configuration bit
GAINZC2
GAINZC1
GAINZC0
Description
0
0
0
ZC_OFFSET = -3.2 mV (default)
0
0
1
ZC_OFFSET = -9.6 mV
0
1
0
ZC_OFFSET = -16 mV
0
1
1
ZC_OFFSET = -22.4 mV
1
0
0
ZC_OFFSET = 22.4 mV
1
0
1
ZC_OFFSET = 16 mV
1
1
0
ZC_OFFSET = 9.6 mV
1
1
1
ZC_OFFSET = 3.2 mV
Figure 76. Zero-current detection simplified block diagram
DIGITAL
LOOP
CTRL
HIZ
ISENn
VREF1/CFILT
Gm
PWMn
-
+
GND
VCC
DRV
GND
VREF2/CFILT
ZC
R
S
ZC_MASK_DELAY
PWM
PWM
+
-
ZC_OFFSET
Zero current detection masking time in terms of successive PWM periods can be configured by a dedicated
PMBus™ bit ZC_MASK_DELAY<2:0>.
ZCMASKDELAY=ZCMASKDELAYlsb×ZCMASKDELAY2:0
(65)
Where:
ZC_MASK_DELAY_lsb is the minimum masking step [25 ns].
ZC_MASK_DELAY [2:0] are the dedicated PMBus™ configuration bits [0 ~ 175 ns].
The default value is ZC_MASK_DELAY = 0x0.
This nonlinear control forces the DrMOS state according to control loop assertion while switch DrMOS to tristate
as soon as phase current crosses the zero level, thus emulating an asynchronous rectification.
As a consequence of this behavior the loop controller reacts by linearly reducing the equivalent switching
frequency that effectively results in lowered switching losses.
STPM098C
Functional description
DS14440 - Rev 1
page 91/110



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