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參數(shù)資料
| 型號： | LT3758MPMSE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 10/36頁 |
| 文件大小： | 554K |
| 代理商： | LT3758MPMSE#PBF |
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LT3758
18
3758fc
ApplicAtions inForMAtion
The flyback converter can be designed to operate either
in continuous or discontinuous mode. Compared to con-
tinuous mode, discontinuous mode has the advantage of
smaller transformer inductances and easy loop compen-
sation, and the disadvantage of higher peak-to-average
current and lower efficiency.
to the number of variables involved. The user can choose
either a duty cycle or a turns ratio as the start point. The
following trade-offs should be considered when select-
ing the switch duty cycle or turns ratio, to optimize the
converter performance. A higher duty cycle affects the
flyback converter in the following aspects:
Lower MOSFET RMS current ISW(RMS), but higher
MOSFET VDS peak voltage
Lower diode peak reverse voltage, but higher diode
RMS current ID(RMS)
Higher transformer turns ratio (NP/NS)
The choice,
D
+D2
=
1
3
(for discontinuous mode operation with a given D3) gives
the power MOSFET the lowest power stress (the product
of RMS current and peak voltage). The choice,
D
+D2
=
2
3
(for discontinuous mode operation with a given D3) gives
the diode the lowest power stress (the product of RMS
current and peak voltage). An extreme high or low duty
cycle results in high power stress on the MOSFET or diode,
and reduces efficiency. It is recommended to choose a
duty cycle between 20% and 80%.
Figure 7. A Simplified Flyback Converter
RSENSE
NP:NS
VIN
CIN
CSN
VSN
LP
D
SUGGESTED
RCD SNUBBER
ID
VDS
ISW
3758 F07
GATE
GND
LT3758
SENSE
LS
M
+
–
+
–
RSN
DSN
+
–
+
COUT
+
Figure 8. Waveforms of the Flyback Converter
in Discontinuous Mode Operation
3758 F08
ISW
VDS
ID
t
DTS
D2TS
D3TS
ISW(MAX)
ID(MAX)
TS
Flyback Converter: Switch Duty Cycle and Turns Ratio
The flyback converter conversion ratio in the continuous
mode operation is:
VOUT
VIN
=
NS
NP
D
1
D
Where NS/NP is the second to primary turns ratio.
Figure 8 shows the waveforms of the flyback converter
in discontinuous mode operation. During each switching
period TS, three subintervals occur: DTS, D2TS, D3TS.
During DTS, M is on, and D is reverse-biased. During
D2TS, M is off, and LS is conducting current. Both LP and
LS currents are zero during D3TS.
The flyback converter conversion ratio in the discontinu-
ous mode operation is:
VOUT
VIN
=
NS
NP
D
D2
Accordingtotheprecedingequations,theuserhasrelative
freedom in selecting the switch duty cycle or turns ratio to
suit a given application. The selections of the duty cycle
and the turns ratio are somewhat iterative processes, due
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| LT3759HMSE#PBF | 功能描述:IC REG CTRLR BST INV PWM 12-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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