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PM6686 Datasheet(PDF) 41 Page - STMicroelectronics

Part # PM6686
Description  Constant ON-time control
PDF  50 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6686 Datasheet(HTML) 41 Page - STMicroelectronics

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PM6686
Application information
Doc ID 15281 Rev 4
41/50
The power dissipation of the low-side MOSFET is given by:
Equation 17
Maximum conduction losses occur at the maximum input voltage:
Equation 18
Choose a synchronous rectifier with low RDS(on). When high-side MOSFET turns on, the
fast variation of the phase node voltage can bring up even the low-side gate through its
gate-drain capacitance CRSS, causing cross-conduction problems. Choose a low-side
MOSFETs that minimizes the ratio CRSS/CGS (CGS = CISS - CRSS).
Below there is a list of some possible low-side MOSFETs.
Dual N-channel MOSFETs can be used in applications with a maximum output current of
about 3 A. Below there is a list of some MOSFETs manufacturers.
Table 17.
High-side MOSFET manufacturer
Manufacturer
Type
Gate charge (nC)
RDS(on) (mΩ) Rated reverse voltage (V)
ST
STS12NH3LL
10
8
30
ST
STS17NH3LL
18
4
30
Table 18.
Low-side MOSFET manufacturer
Manufacturer
Type
RDS(on) (mΩ)
Rated reverse voltage
(V)
ST
STS17NF3LL
5.5
0.047
30
ST
STS25NH3LL
3.5
0.011
30
Table 19.
Dual MOSFET manufacturer
Manufacturer
Type
RDS(on) (mΩ)
Gate charge
(nC)
Rated reverse voltage
(V)
ST
STS8DNH3LL
25
10
30
ST
STS4DNF60L
65
32
60
conduction
DLowSide
P
P
=
2
LOAD
max
IN
OUT
DSon
conduction
(max)
I
V
V
1
R
P
×
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
×
=
GS
RSS
C
C



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