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參數(shù)資料
| 型號(hào)： | LNK626DG-TL |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO7 |
| 封裝： | GREEN, PLASTIC, MS-012, SOP-8/7 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大小： | 535K |
| 代理商： | LNK626DG-TL |
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Rev. E 09/09
4
LNK623-626
www.powerint.com
Applications Example
Circuit Description
This circuit is congured as a three output, primary-side
regulated yback power supply utilizing the LNK626PG. It can
deliver 7 W continuously and 10 W peak (thermally limited) from
an universal input voltage range (85 – 265 VAC). Efciency is
>67% at 115 VAC/230 VAC and no-load input power is
<140 mW at 230 VAC.
Input Filter
AC input power is rectied by diodes D1 through D4. The
rectied DC is ltered by the bulk storage capacitors C1 and
C2. Inductor L1, L2, C1 and C2 form a pi (π) lter, which
attenuates conducted differential-mode EMI noise. This
conguration along with Power Integrations transformer
E-shield technology allow this design to meet EMI standard
EN55022 class B with good margin without requiring a
Y capacitor. Fuse F1 provides protection against catastrophic
failure. Negative temperature coefcient thermistor RT1 limits
the inrush current when AC is rst applied to below the
maximum rating of diodes D1 through D4. Metal oxide varistor
RV1 clamps the AC input during differential line transients,
protecting the input components and maintaining the peak
drain voltage of U1 below its 700 V BV
DSS rating.
For differential
surge levels at or below 2 kV this component may be omitted.
LNK626 Primary
The LNK626PG device (U1) incorporates the power switching
device, oscillator, CV control engine, startup, and protection
functions. The integrated 700 V MOSFET provides a large drain
voltage margin in universal input AC applications, increasing
reliability and also reducing the output diode voltage stress by
allowing a greater transformer turns ratio. The device can be
completely self-powered from the BYPASS pin and decoupling
capacitor C4. In this design a bias circuit (D6, C6 and R4) was
added to reduce no load input power below 140 mW.
The rectied and ltered input voltage is applied to one side of
the primary winding of T1. The other side of the transformer’s
primary winding is driven by the integrated MOSFET in U1. The
leakage inductance drain voltage spike is limited by the clamp
circuit D5, R1, R2, C3 and VR1. The zener bleed clamp
arrangement was selected for lowest no-load input power but in
applications where higher no-load input power is acceptable
VR1 may be omitted and the value of R1 increased to form a
standard RCD clamp.
Output Rectication
The secondaries of the transformer are rectied by D7, D8 and
D9. A Schottky barrier type was used for the main 5 V output
for higher efciency. The +12 V and -22 V outputs use an
ultrafast rectier diode. The main output is post ltered by L3
and C10 to remove switching frequency ripple. Resistors R7,
R8 and R9 provide a preload to maintain the output voltages
within their respective limits when unloaded. To reduce high
frequency ringing and associated radiated EMI an RC snubber
formed by R10 and C13 was added across D7.
Figure 4.
7 W (10 W peak) Multiple Output Flyback Converter for DVD Applications with Primary Sensed Feedback.
PI-5205-102208
D
S
FB
BP
R3
6.34 k
1%
C13
270 pF
R6
4.02 k
1%
R1
5.1 k
1/8 W
R2
390
R4
6.2 k
C4
1 F
50 V
C5
680 pF
50 V
C8
1000 F
10 V
C10
470 F
10 V
C11
47 F
50 V
C9
47 F
25 V
C6
10 F
50 V
R5
47 k
1/8 W
U1
LNK626PG
LinkSwitch-CV
D8
UF4003
D7 SB540
D6
1N4148
D9
UF4003
R9
39 k
1/8 W
R8
24 k
1/8 W
R7
510
1/8 W
T1
EEL19
16
7
11
8,9,10
12
5
4
2
3
C1
22 F
400 V
C2
22 F
400 V
C3
820 pF
1 kV
F1
3.15 A
RT1
10
85 - 265
VAC
L
N
D1
FR106
D2
FR106
VR1
1N5272B
D5
1N4007
D3
1N4007
D4
1N4007
L1
3.5 × 7.6 mm
Ferrite Bead
L2
680 uH
L3
10 H
12 V, 0.1 A
5 V, 1.7 A
RTN
-22 V, 15 mA
RV1
275 V
R10
47
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LNK626PG | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 8.5 W (85-265 VAC) RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| LNK632DG | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 3.1 W (85-265 VAC) RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| LNK632DG-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 3.1 W (85-265 VAC) RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| LNK6663E | 功能描述:初級(jí)與次級(jí)側(cè) PWM 控制器 Off-Line Switcher PSR, LinkSwitch - HP RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
| LNK6663V | 功能描述:初級(jí)與次級(jí)側(cè) PWM 控制器 Off-Line Switcher IC PSR LinkSwitch HP RoHS:否 制造商:ON Semiconductor 輸出端數(shù)量:1 開關(guān)頻率:250 KHz 工作電源電壓:- 0.3 V to + 28 V 最大工作溫度:+ 85 C 最小工作溫度:- 5 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Reel |
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