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參數(shù)資料
| 型號： | TNY264PG |
| 英文描述： | 4-23 W TinySwitch-II family of energy efficient. |
| 中文描述： | 4-23糯的TinySwitch -Ⅱ系列高效的能源。 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大小： | 200K |
| 代理商： | TNY264PG |
8
C
4/03
TNY264/266-268
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
(85-265 VAC). The inductor (L1) forms a
π
-filter 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
-filter described above in combination
with a single low value Y1-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
of transistor Q1 to sense the voltage across the current sense
resistor R4. When the drop across R4 exceeds the V
of
transistor Q1, it turns on and takes over control of the loop by
driving the optocoupler LED. Resistor R6 assures sufficient
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 sufficient to keep the Q1 and LED circuit active.
Resistors R7 and R9 limit the forward current that could be
drawn through VR1 by Q1 under output short circuit conditions,
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. They both provide two outputs: an isolated 5 V
and a 12 V primary referenced output. The first, using TNY266P,
provides 10 W, and the second, using TNY267P, 15 W of
output power. Both operate from an input range of 140 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 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 voltage goes
below a level needed to maintain output regulation, 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 4 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 rectified 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 rectified
DC input voltage to provide the required hold up time for the
standby output.
The auxiliary primary side winding is rectified and filtered by
D2 and C2 to create a 12 V primary bias output voltage for the
main power supply primary controller. In addition, this voltage
is 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
μ
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 rectified and filtered by D3 and C6.
For a 15 W design an additional output capacitor, C7, is
required due to the larger secondary ripple currents compared
to the 10 W standby design. The auto-restart function limits
output current during short circuit conditions, removing the
need to over rate D3. Switching noise filtering 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 sufficient
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.
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PDF描述 |
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| TNY266PG | 4-23 W TinySwitch-II family of energy efficient. |
| TNY267PG | 4-23 W TinySwitch-II family of energy efficient. |
| TNY268PG | 4-23 W TinySwitch-II family of energy efficient. |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TNY264PN | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 6W 85-265 VAC 9W/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 |
| TNY264PN-TL | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:Enhanced, Energy Efficient, Low Power Off-line Switcher |
| TNY264PTL | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:Enhanced, Energy Efficient, Low Power Off-line Switcher |
| TNY265G | 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 |
| TNY265GN | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 7.5W 85-265 VAC 11W/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 |
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