ISL6609 Datasheet, PDF (10/12 Pages) Intersil Corporation – Synchronous Rectified MOSFET Driver

ISL6609, ISL6609A
Therefore, the actual coupling effect should be examined
using a very high impedance (10MΩ or greater) probe to
ensure a safe design margin.
⎛
---------–----^V----^D-----^S-----------⎞
V _{G S _MILLER}
=
d_----V_---
dt
⋅
R
⋅
C_rs
⎜
⎜
s⎜
1
–
e
d_----V_---
dt
⋅
R
⋅
Ci
⎟
s s⎟
⎟
⎜
⎟
⎝
⎠
(EQ. 5)
R = R_UGPH + R_GI
C_rss = C_GD
C_iss = C_GD + C_GS
VCC
DU
DL
BOOT
C_BOOT
UGATE G
PHASE
C_GD
VIN
D
C_DS
R_GI
C_GS
S
Q_UPPER
FIGURE 5. GATE TO SOURCE RESISTOR TO REDUCE
UPPER MOSFET MILLER COUPLING
10
FN9221.2
April 27, 2009