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RT9602GS bảng dữ liệu(PDF) 7 Page - Richtek Technology Corporation

tên linh kiện RT9602GS
Giải thích chi tiết về linh kiện  Dual Channel Synchronous-Rectified Buck MOSFET Driver
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RT9602
7
DS9602-08
March 2007
www.richtek.com
According to the design of RT9602, before driving the gate
of the high side MOSFET up to 12V (or 5V), the low side
MOSFET has to be off; and the high side MOSFET is
turned off before the low side is turned on. From Figure 1,
the body diode
"D
2" had been turned on before high side
MOSFETs turned on
Before the low side MOSFET is turned on, the Cgd2 have
been charged to Vi. Thus, as Cgd2 reverses its polarity and
g2 is charged up to 12V, the required current is
g1
gs1
gs1
gs1
r1
g2
gs2
gs2
gs2
r2
dV
C
12
l
= C
=
(1)
dt
t
dV
C
12
l
= C
=
(2)
dt
t
×
×
gd2
gd2
gd2
r2
dV
Vi+12V
l
= C
= C
(4)
dt
t
gd1
g1
gd1
r1
dV
12V
l
= C
= C
(3)
dt
t
-12
-9
gs1
1660 10
12
l
=
= 1.428 (A)
(5)
14 10
××
×
-12
-9
gs2
2200 10
12
l
=
= 0.88 (A)
(6)
30 10
××
×
It is helpful to calculate these currents in a typical case.
Assume a synchronous rectified BUCK converter, input
voltage Vi = 12V, Vg1 = Vg2 = 12V. The high side MOSFET
is PHB83N03LT whose Ciss = 1660pF, Crss = 380pF,and tr
= 14nS. The low side MOSFET is PHB95N03LT whose
Ciss = 2200pF, Crss = 500pF, and tr = 30nS, from the
equation (1) and (2) we can obtain
Figure 2. Two- Phase Synchronous-Buck Converter Circuit
BOOT1
UGATE1
PHASE1
LGATE1
VCC
PVCC
PWM1
PWM2
RT9602
11
14
5
1
2
4
13
12
UGATE2
PHASE2
LGATE2
BOOT2
GND
PGND
10
1uF
12V
1uF
PHB83N03LT
PHB95N03LT
2uH
1uF
1000uF
1.2uH
12V
7
8
9
PHB83N03LT
PHB95N03LT
2uH
1uF
1000uF
1uF
V
CORE
1500uF
1500uF
3
6
L1
C1
L2
C5
C6
Q3
Q4
L3
C3
C4
Q2
Q1
C2
Cb1
D1
D2
Cb2
R1
C7
PWM1
PWM2
10
Vin
from equation. (3) and (4)
the total current required from the gate driving source is
By a similar calculation, we can also get the sink current
required from the turned off MOSFET.
Layout Consider
Figure 2. shows the schematic circuit of a two-phase
synchronous-buck converter to implement the RT9602. The
converter operates for the input rang from 5V to 12V.
-12
-9
gs1
380 10
12
l
=
= 0.326 (A)
(7)
14 10
××
×
-12
-9
gs2
500 10
(12+12)
l
=
= 0.4(A)
(8)
30 10
××
×
g1
gs1
gd1
I
= I
+I
= (1.428+0.326) = 1.745(A)
(9)
g2
gs2
gd2
I
= I
+I
= (0.88+0.4) = 1.28(A)
(10)



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