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參數(shù)資料
| 型號(hào)： | LTC3766EUFD#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, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件頁數(shù)： | 33/60頁 |
| 文件大?。?/td> | 607K |
| 代理商： | LTC3766EUFD#PBF |
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LTC3766
39
3766f
APPLICATIONS INFORMATION
At maximum VIN, there may be considerable power dis-
sipation in the linear regulator pass device Q1. This power
can be calculated using
PQ1 = (VBIAS – VCC)IVCC
In applications where the peak charge and high voltage
linear regulator must operate continuously, transistor
Q1 must be capable of dissipating this power without
excessive temperature rise. In such applications, use a
transistor with a suitable package (SOT89) and connect
the thermal tab of the transistor to an adequately large
island of copper on the PCB.
High Efficiency Secondary-Side Bias Techniques
A high-efficiency alternative to using a peak-charge circuit
togeneratesecondary-sidebiasistoconnectabuckoutput
tothetransformersecondary.Thisbuckoutputisnormally
combinedwithapeakchargecircuitasshowninFigures23
and 24. The bias voltage from this buck output can be fed
directly into the VAUX pin. This arrangement combines
the quick start-up and flexibility of a peak charge circuit
with the higher operating efficiency of a buck bias supply.
For Figure 23, the output voltage of the buck bias supply
is given by:
VBUCK = VOUT 1+
NAUX
NS
– 0.5
For Figure 24 the output is given by:
VBUCK = VOUT
NAUX
NS
– 0.5
For a buck bias supply, inductor LBK must be rated to
carry the required VCC bias current and should have an
inductance value that will provide continuous current
operation at one-fourth of the required bias current load
or less. Choose and inductor LBK to according to:
LBK >
VCC
ICCfSW
A value of 1mH for LBK is adequate for most applications.
The output voltage of the buck bias supply (VBUCK) should
be set to optimize efficiency during normal operation.
This will typically require a somewhat higher number of
auxiliary turns than is ideal for a peak charge output. As
a result, the buck supply and the peak charge circuit are
sometimes driven from separate auxiliary windings. Also,
note that the output voltage of the peak charge circuit will
increase somewhat when the VAUX bypass regulator is
activated and the high voltage linear regulator is disabled.
Care must be taken not to exceed the maximum voltage
rating on the VIN pin of the LTC3766.
Figure 23. Buck Bias Supply for Low VOUT Applications
Figure 24. Buck Bias Supply for High VOUT Applications
VIN
VAUX
REGSD
RPK
DPK
NS
NAUX
SW
NP
CVCC
3766 F23
NDRV
LTC3766
OPTION TO
LIMIT Q1 POWER
MAIN
XFMR
VBIAS = 6V TO 32V
VCC
DBK
LBK
DBK
CPK
CRSD
CBK
VBUCK
Q1
VIN
VAUX
REGSD
RPK
DPK
NS
NAUX
SW
NP
CVCC
3766 F24
NDRV
LTC3766
OPTION TO
LIMIT Q1 POWER
MAIN
XFMR
VBIAS = 6V TO 32V
VCC
DBK
LBK
DBK
CPK
CRSD
CBK
VBUCK
Q1
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