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參數(shù)資料
| 型號(hào)： | TNY266GNTL |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.56 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PDSO7 |
| 封裝： | LEAD FREE, PLASTIC, SMD-8/7 |
| 文件頁數(shù)： | 23/24頁 |
| 文件大小： | 1212K |
| 代理商： | TNY266GNTL |
8 G4/05
TNY263-268
line sense resistors R2 and R3 sense the DC input voltage
for line under-voltage. When the AC is turned off, the under-
voltage detect feature of the TinySwitch-II prevents auto-restart
glitches at the output caused by the slow discharge of large
storage capacitance in the main converter. This is achieved by
preventing the TinySwitch-II from switching when the input
voltagegoesbelowalevelneededtomaintainoutputregulation,
and keeping it off until the input voltage goes above the under-
voltage threshold, when the AC is turned on again. With R2
and R3, giving a combined value of 2 M, the power up under-
voltage threshold is set at 200 VDC, slightly below the lowest
required operating DC input voltage, for start-up at 170 VAC,
with doubler. This feature saves several components needed to
implement the glitch-free turn-off compared with discrete or
TOPSwitch-II
based designs. During turn-on the rectied DC
input voltage needs to exceed 200 V under-voltage threshold
for the power supply to start operation. But, once the power
supply is on it will continue to operate down to 140 V rectied
DC input voltage to provide the required hold up time for the
standby output.
The auxiliary primary side winding is rectied and ltered by
D2 and C2 to create a 12 V primary bias output voltage for the
mainpowersupplyprimarycontroller.Inaddition,thisvoltageis
used to power the TinySwitch-II via R4.Although not necessary
for operation, supplying the TinySwitch-II externally reduces
the device quiescent dissipation by disabling the internal drain
derived current source normally used to keep the BYPASS pin
capacitor (C3) charged. An R4 value of 10 k provides 600 A
into the BYPASS pin, which is slightly in excess of the current
consumption of TinySwitch-II. The excess current is safely
clamped by an on-chip active Zener diode to 6.3 V.
The secondary winding is rectied and ltered by D3 and C6.
Fora15 Wdesignanadditionaloutputcapacitor,C7,isrequired
duetothelargersecondaryripplecurrentscomparedtothe10 W
standby design. The auto-restart function limits output current
during short circuit conditions, removing the need to over rate
D3. Switching noise ltering is provided by L1 and C8. The
5 V output is sensed by U2 and VR1. R5 is used to ensure that
the Zener diode is biased at its test current and R6 centers the
output voltage at 5 V.
In many cases the Zener regulation method provides sufcient
accuracy (typically ± 6% over a 0 °C to 50 °C temperature
range). This is possible because TinySwitch-II limits the
dynamic range of the optocoupler LED current, allowing the
Zener diode to operate at near constant bias current. However,
if higher accuracy is required, a TL431 precision reference IC
may be used to replace VR1.
2.5 W CV/CC Cell-Phone Charger
As an example, Figure 14 shows a TNY264 based 5 V,
0.5 A, cellular phone charger operating over a universal input
range (85 VAC to 265 VAC). The inductor (L1) forms a
π-lter in conjunction with C1 and C2. The resistor R1 damps
resonances in the inductor L1. Frequency jittering operation
of TinySwitch-II allows the use of a simple π-lter described
aboveincombinationwithasinglelowvalueY1-capacitor(C8)
to meet worldwide conducted EMI standards. The addition
of a shield winding in the transformer allows conducted EMI
to be met even with the output capacitively earthed (which is
the worst case condition for EMI). The diode D6, capacitor
C3 and resistor R2 comprise the clamp circuit, limiting the
leakage inductance turn-off voltage spike on the TinySwitch-II
DRAIN pin to a safe value. The output voltage is determined
by the sum of the optocoupler U2 LED forward drop (~1 V),
and Zener diode VR1 voltage. Resistor R8 maintains a bias
current through the Zener diode to ensure it is operated close
to the Zener test current.
A simple constant current circuit is implemented using the V
BE
of transistor Q1 to sense the voltage across the current sense
resistor R4. When the drop across R4 exceeds the V
BE of
transistor Q1, it turns on and takes over control of the loop by
driving the optocoupler LED. Resistor R6 assures sufcient
voltage to keep the control loop in operation down to zero volts
at the output. With the output shorted, the drop across R4 and
R6 (~1.2 V) is sufcient to keep the Q1 and LED circuit active.
Resistors R7 and R9 limit the forward current that could be
drawnthroughVR1byQ1underoutputshortcircuitconditions,
due to the voltage drop across R4 and R6.
10 and 15 W Standby Circuits
Figures 15 and 16 show examples of circuits for standby
applications.Theybothprovidetwooutputs:anisolated5 Vand
a 12 V primary referenced output. The rst, using TNY266P,
provides 10 W, and the second, using TNY267P, 15 W of
output power. Both operate from an input range of 140 VDC to
375 VDC, corresponding to a 230 VAC or 100/115 VAC with
doubler input. The designs take advantage of the line under-
voltage detect, auto-restart and higher switching frequency of
TinySwitch-II
. Operation at 132 kHz allows the use of a smaller
and lower cost transformer core, EE16 for 10 W and EE22 for
15 W. The removal of pin 6 from the 8 pin DIP TinySwitch-II
packages provides a large creepage distance which improves
reliability in high pollution environments such as fan cooled
power supplies.
Capacitor C1 provides high frequency decoupling of the high
voltage DC supply, only necessary if there is a long trace
length from the DC bulk capacitors of the main supply. The
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TNY266GN-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 9.5W 85-265 VAC 15W/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 |
| TNY266GTL | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:Enhanced, Energy Efficient, Low Power Off-line Switcher |
| TNY266G-TL | 功能描述:IC OFFLINE SWIT OTP OCP 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:TinySwitch®-II 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 |
| TNY266P | 功能描述:IC OFFLINE SWIT OTP OCP 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:TinySwitch®-II 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 |
| TNY266P_1 | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:4.9W DVD power supply |
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