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FDMF6705 Datasheet(PDF) 15 Page - ON Semiconductor

Part No. FDMF6705
Description  Extra-Small, High-Performance, High-Frequency DrMOS Module
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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FDMF6705 Datasheet(HTML) 15 Page - ON Semiconductor

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© 2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FDMF6705 • Rev. 1.0.4
14
Skip Mode (SMOD)
The SMOD function allows for higher converter
efficiency under light-load conditions. During SMOD, the
low-side FET gate signal is disabled (held LOW),
preventing discharging of the output capacitors as the
filter inductor current attempts reverse current flow –
also known as “Diode Emulation” Mode. When the
SMOD pin is pulled HIGH, the synchronous buck
converter works in Synchronous Mode, gating on the
low-side FET. When the SMOD pin is pulled LOW, the
low-side FET is gated off. The SMOD pin is connected
to the PWM controller, which enables or disables the
SMOD automatically when the controller detects light-
load condition from output current sensing. Normally this
pin is active LOW. See Figure 27 for timing delays.
Table 2.
SMOD Logic
DISB#
PWM
SMOD#
GH
GL
0
X
X
0
0
1
3-State
X
0
0
1
0
0
0
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
0
Note:
4.
The SMOD feature is intended to have low
propagation delay between the SMOD signal and
the low-side FET VGS response time to control
diode emulation on a cycle-by-cycle basis.
Figure 27. SMOD Timing Diagram
tD_DEADON
PWM
VSWH
GH
to
VSWH
GL
tPD_PHGLL
tPD_PLGHL
tD_DEADOFF
VIH_PWM
VIL_PWM
90%
10%
90%
1.0V
2.2V
tPD_PHGHH
tPD_SHGLH
Delay from SMOD# going
HIGH to LS VGS HIGH
HS turn -on with SMOD# LOW
SMOD#
tPD_SLGLL
Delay from SMOD# going
LOW to LS VGS LOW
DCM
CCM
CCM
10%
VIH_PWM
10%
VOUT
VIH_SMOD
VIL_SMOD
10%


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