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參數資料
| 型號： | SC4910AITSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Secondary Side Controller with Synchronous Rectifier |
| 中文描述： | 高性能二次側同步整流控制器 |
| 文件頁數： | 11/19頁 |
| 文件大?。?/td> | 330K |
| 代理商： | SC4910AITSTRT |
11
2005 Semtech Corp.
www.semtech.com
SC4910A/B
POWER MANAGEMENT
Applications Information (Cont.)
Type 2 compensator (Figure 3) is needed for the above
current mode control. The compensation network gives
the following characteristics:
p
z
1
COMP
s
1
s
1
s
G
ω
+
ω
+
ω
=
Figure 3
where
3
1
3
1
+
2
PC
1
1
2
ZC
3
1
1
1
C
C
C
C
R
C
R
1
)
C
C
(
R
1
=
ω
=
ω
+
=
ω
The loop gain will be given by:
O
ref
PC
ZC
s
1
p
z
vgo
FB
COMP
vg
V
V
1
s
1
s
s
1
s
1
G
K
G
G
T
ω
+
ω
+
ω
ω
+
ω
+
=
=
Figure 4
The goal of the compensation design is to shape the loop
with high DC gain, high bandwidth, enough phase margin,
and high attenuation for high frequency noises. Figure 4
gives the asymptotic diagrams of the power stage with
current loop closed and its loop gain.
One integrator is added to increase the DC gain. W
is
used to cancel the power stage pole w
so that the loop
gain has –20dB rate when it reaches 0 dB line. w
is
placed at output capacitor ESR or half switching frequency,
whichever is lower.
Arbitrarily choose R2, then
)
C
C
(
1
R
,
1
C
C
,
R
C
3
1
I
1
ZC
PC
1
3
P
2
1
ω
1
+
ω
=
ω
ω
=
=
ω
is adjusted for satisfactory phase margin and
crossover frequency.
Synchronization
Synchronization of oscillators in multiphase operation
allows for reduced size of filtering components and
improved dynamic response.
SC4910 provides single stage conversion where SC4201
provides the multiphase function. SC4910 and SC4201
are placed on the secondary side, outputs A and C of the
SC4201 are fed into the Sync pins of 2 separate
SC4910’s. Both power supplies operate 180 degrees
apart. SC4201 can be configured up to 4 phase
operation.
R2
C3
C1
R1
Vref
-
+
ω
C
ω
pc
ω
Z
ω
P
Loop gain T(s)
Power stage
Compensator
ω
zc
fs
相關PDF資料 |
PDF描述 |
|---|---|
| SC4910B | High Performance Secondary Side Controller with Synchronous Rectifier |
| SC4910BITSTRT | High Performance Secondary Side Controller with Synchronous Rectifier |
| SC4911 | Bias/Primary Side PWM Controller with Ultra Low Start-up Current |
| SC4911IMSTR | Bias/Primary Side PWM Controller with Ultra Low Start-up Current |
| SC4911IMSTRT | Bias/Primary Side PWM Controller with Ultra Low Start-up Current |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC4910B | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Secondary Side Controller with Synchronous Rectifier |
| SC4910BITSTRT | 制造商:Semtech Corporation 功能描述:Secondary Side PWM Cntrlr SYNC POST REGUL 450KHz to 550KHz 20-Pin TSSOP T/R 制造商:Semtech Corporation 功能描述:ADV SCND SIDE CNTRL W/SYNCH RE |
| SC4911 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Bias/Primary Side PWM Controller with Ultra Low Start-up Current |
| SC4911IMSTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Bias/Primary Side PWM Controller with Ultra Low Start-up Current |
| SC4911IMSTRT | 制造商:Semtech Corporation 功能描述: |
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