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參數(shù)資料
| 型號(hào)： | LNK500 |
| 廠商： | Power Integrations, Inc. |
| 英文描述： | Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers |
| 中文描述： | 節(jié)能，簡歷或CV /切換消委會(huì)極低的成本適配器和充電器 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 505K |
| 代理商： | LNK500 |
8
LNK500
B
3/03
To aid the designer, the power table reflects these differences.
For CV/CC designs the typical power column and for CV
designs the minimum power column should be used,
respectively. Additionally, figures are based on the following
conditions:
1. The minimum DC input bus voltage is 90 V or higher. This
corresponds to a filter capacitor of 3
μ
F/W for universal
input and 1
μ
F/W for 230 VAC or 115 VAC input with
doubler input stage.
2. Design is a discontinuous mode flyback converter.
Continuous mode designs can result in loop instability and
are therefore not recommended. For typical output power
figures, nominal values for primary inductance and I
2
f are
assumed. For minimum output power figures, primary
inductance minus 10% and the minimum I
2
f value are
assumed. For no-load consumption <300 mW, a V
in the
range 40 V to 60 V is assumed. For no-load consumption
<500 mW and higher output power capability, a V
OR
in the
range 60 V to
100 V is assumed.
3. A secondary output of 5 V with a Schottky rectifier diode.
4. Assumed efficiency of 70%.
5. The part is board mounted with SOURCE pins soldered to
sufficient area of copper to keep the die temperature at or
below 100
°
C.
6. An output cable with a total resistance of 0.2
.
In addition to the thermal environment (sealed enclosure,
ventilated, open frame, etc), the maximum power capability of
LinkSwitch
in a given application depends on transformer core
size, efficiency, primary inductance tolerance, minimum
specified input voltage, input storage capacitance, output voltage,
output diode forward drop, etc., and can be different from the
values shown in Table 1.
Transformer Design
To provide an approximately CV/CC output, the transformer
should be designed to be discontinuous; all the energy stored in
the transformer is transferred to the secondary during the
MOSFET off time. Energy transfer in discontinuous mode is
independent of line voltage.
The peak power point prior to entering constant current operation
is defined by the maximum power transferred by the transformer.
The power transferred is given by the expression P = 0.5
·
L
·
I
2
·
f,
where L is the primary inductance, I
2
is the primary peak current
squared and f is the switching frequency.
To simplify analysis, the data sheet parameter table specifies an
I
2
f coefficient. This is the product of current limit squared and
switching frequency normalized to the feedback parameter
I
. This provides a single term that specifies the variation of
the peak power point in the power supply due to
LinkSwitch
.
As primary inductance tolerance is part of the expression that
determines the peak output power point (start of the CC
characteristic) this parameter should be well controlled. For an
estimated overall constant current tolerance of
±
25% the primary
inductance tolerance should be
±
10% or better. This is achievable
using standard low cost, center leg gapping techniques where
the gap size is typically 0.08 mm or larger. Smaller gap sizes
are possible but require non-standard, tighter ferrite A
L
tolerances.
Other gapping techniques such as film gapping allow tighter
tolerances (
±
7% or better) with associated improvements in the
tolerance of the peak power point. Please consult your
transformer vendor for guidance.
Core gaps should be uniform. Uneven core gapping, especially
with small gap sizes, may cause variation in the primary
inductance with flux density (partial saturation) and make the
constant current region non-linear. To verify uniform gapping
it is recommended that the primary current wave-shape be
examined while feeding the supply from a DC source. The
gradient is defined as di/dt = V/L and should remain constant
throughout the MOSFET on time. Any change in gradient of
the current ramp is an indication of uneven gapping.
Measurements made using a LCR bridge should not be solely
relied upon; typically these instruments only measure at currents
of a few milliamps. This is insufficient to generate high enough
flux densities in the core to show uneven gapping.
For a typical EE13 core using center leg gapping, a 0.08 mm gap
(A
of 190 nH/t
2
) allows a primary inductance tolerance of
±
10% to be maintained in standard high volume production.
This allows the EE13 to be used in designs up to 2.75 W with
less than 300 mW no-load consumption. If film gapping is used
then this increases to 3 W. Moving to a larger core, EE16 for
example, allows a 3 W output with center leg gapping.
The transformer turns ratio should be selected to give a V
(output voltage reflected through secondary to primary turns
ratio) of 40 V to 60 V. In designs not required to meet 300 mW
no-load consumption targets, the transformer can be designed
with higher V
as long as discontinuous mode operation is
maintained. This increases the output power capability. For
example, a 230 VAC input design using an EE19 transformer
core with VOR >70 V, is capable of delivering up to 5.5 W
typical output power. Note: the linearity of the CC region of the
power supply output characteristic is influenced by V
. If this
is an important aspect of the application, the output characteristic
should be checked before finalizing the design.
Output Characteristic Variation
Both the device tolerance and external circuit govern the overall
tolerance of the
LinkSwitch
output characteristic. Estimated
peak power point tolerances for a 3 W design are
±
10% for
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LNK500G | 功能描述:IC SWIT OCP CV/CC HV 8SMD RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:LinkSwitch® 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
| LNK500GN | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 3W 85-265 VAC 4W 230 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 |
| LNK500GN-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 3W 85-265 VAC 4W 230 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 |
| LNK500G-TL | 功能描述:IC SWIT OCP CV/CC HV 8SMD RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:LinkSwitch® 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
| LNK500P | 功能描述:IC SWIT OCP CV/CC HV 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:LinkSwitch® 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
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