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參數(shù)資料
| 型號： | LTC3766IGN#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 44/60頁 |
| 文件大小： | 607K |
| 代理商： | LTC3766IGN#PBF |
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LTC3766
49
3766f
APPLICATIONS INFORMATION
Volt-Second Clamp
When used in applications with the LTC3765, direct flux
limit will guarantee that no saturation occurs on the main
transformer. Consequently, there is no need to use a volt-
second clamp in applications that have the direct flux
limit feature. In applications where the LTC3766 is used
standalone, however, the volt-second clamp can be used
as a failsafe to prevent excessive volt-seconds from being
applied to the main transformer during the PWM on-time.
Figure 35 illustrates the use of the volt-second clamp. As
shown in Figure 35, the SW voltage is used to monitor
the voltage applied to the main transformer. During the
PWM on-time, the CVS capacitor is charged by the SW
node through the RVS resistor.
For capacitor CVS, use a 5% or better NPO-type ceramic
capacitor, since accuracy is important. Typically a value
of 1nF is suitable. Likewise, use a 1% resistor for RVS.
In high output voltage applications where the SW node
must be divided down, use the circuit of Figure 36 to set
the volt-second clamp.
SW
MAIN
XFMR
RVS
NS
NP
CVS
3766 F35
LTC3766
VSEC
Figure 35. Using the Volt-Second Clamp
SW
MAIN
XFMR
RVS
NS
NP
CVS
3766 F36
LTC3766
VSEC
R2
R1
Figure 36. Volt-Second Clamp in High VOUT Application
SG
RVIN
(FOR VIN > 30V)
VIN
VCC
VAUX
NDRV
PT+
VOUT
REGSD
LV BIAS
SUPPLY
MODE
PG
SWP
SWB
MAIN
XFMR
SW
VIN
CRST
CRSD
CVAUX
LTC3766
FG
CVIN
5V TO 15V
QP
CVCC
3766 F37
Figure 37. Nonisolated Resonant-Reset Application
The PWM on-time is terminated when a pre-determined
thresholdisreached.Thiswilllimittheappliedvolt-second
product to:
(V S)LIM = 0.605RVSCVS
The above equation is accurate even when the peak volt-
age on the SW node is relatively low and the charging is
nonlinear,suchasinlowVOUTapplications.Thisispossible
because the LTC3766 senses the voltage on the SW pin
and adjusts the internal volt-second comparator reference
so that constant volt-seconds are maintained regardless
of the voltage on SW. Consequently, it is important that
the LTC3766 SW pin be connected to the secondary SW
node for proper sensing of this voltage to occur.
Thevolt-secondlimitshouldnormallybesetapproximately
10% above the operational volt-second requirement. To
accomplish this, calculate RVS using:
RVS =1.10
VOUT
0.605fSWCVS
In this case, assuming RVS >> R1||R2, RVS can be calcu-
lated using:
RVS =1.10
VOUT
0.605fSWCVS
R2
R1
+R2
Nonisolated Applications
In addition to being used with the LTC3765 in isolated
applications, the LTC3766 can also be used standalone to
make a nonisolated resonant-reset forward converter as
shown in Figure 37. In this application, the primary-side
MOSFET is driven directly by the PT+ pin, and the MODE
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