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參數資料
| 型號： | TOP214YAI* |
| 英文描述： | Digital Pushwheel Switch; No. of Switch Positions:16; Leaded Process Compatible:Yes; Mounting Type:Extended Leads; Output Code:Binary Coded Hexadecimal; Peak Reflow Compatible (260 C):No; Switch Features:Rotary Thumbwheel Actuator RoHS Compliant: Yes |
| 中文描述： | 0-100糯的TOPSwitch使用230伏交流輸入或0 |
| 文件頁數： | 7/16頁 |
| 文件大小： | 160K |
D
7/96
TOP200-4/14
7
Simple Optocoupler Feedback
The circuit shown in Figure 8 is a 7.5 V,
15 W secondary regulated flyback power
supply using the TOP202 that will
operate from 85 to 265 VAC input
voltage. Improved output voltage
accuracy and regulation over the circuit
of Figure 7 is achieved by using an
optocoupler and secondary referenced
Zener diode. The general operation of
the power stage of this circuit is the same
as that described for Figure 7.
The input voltage is rectified and filtered
by BR1 and C1. L2, C6 and C7 reduce
conducted emission currents. The bias
winding is rectified and filtered by D3
and C4 to create a typical 11 V bias
voltage. Zener diode (VR2) voltage
together with the forward voltage of the
LED in the optocoupler U2 determine
the output voltage. R1, the optocoupler
current transfer ratio, and the
TOPSwitch
control current to duty cycle transfer
function set the DC control loop gain.
C5 together with the control pin dynamic
impedance and capacitor ESR establish
a control loop pole-zero pair. C5 also
determines the auto-restart frequency
and filters internal gate drive switching
currents. R2 and VR2 provide minimum
current loading when output current is
low. See DN-11 for more information
regarding the use of the TOP202 in a
low-cost, 15 W universal power supply.
Accurate Optocoupler Feedback
The circuit shown in Figure 9 is a highly
accurate, 15 V, 30 W secondary-
regulated flyback power supply that will
operate from 85 to 265 VAC input
voltage. A TL431 shunt regulator
directly senses and accurately regulates
the output voltage. The effective output
voltage can be fine tuned by adjusting
the resistor divider formed by R4 and
R5. Other output voltages are possible
by adjusting the transformer turns ratios
as well as the divider ratio.
The general operation of the input and
power stages of this circuit are the same
as that described for Figures 7 and 8. R3
and C5 tailor frequency response. The
TL431 (U2) regulates the output voltage
by controlling optocoupler LED current
(and
TOPSwitch
duty cycle) to maintain
an average voltage of 2.5 V at the TL431
input pin. Divider R4 and R5 determine
the actual output voltage. C9 rolls off
the high frequency gain of the TL431 for
stable operation. R1 limits optocoupler
LED current and determines high
frequency loop gain. For more
information, refer to application note
AN-14.
Figure 8. Schematic Diagram of a 15 W Universal Input Power Supply Utilizing the TOP202 and Simple Optocoupler Feedback.
PI-1695-112895
7.5 V
RTN
C5
47
μ
F
D2
UG8BT
D3
1N4148
R2
68
VR2
1N5234B
6.2 V
C3
120
μ
F
25 V
T1
D1
UF4005
C2
680
μ
F
25 V
VR1
P6KE150
CIRCUIT PERFORMANCE:
Line Regulation - ±0.5%
(85-265 VAC)
Load Regulation - ±1%
(10 -100%)
Ripple Voltage ± 50 mV
Meets CISPR-22 Class B
BR1
400 V
C1
33
μ
F
400 V
R1
39
U2
NEC2501
U1
TOP202YAI
DRAIN
SOURCE
CONTROL
C4
0.1
μ
F
C7
1 nF
Y1
L1
3.3
μ
H
F1
3.15 A
J1
C6
0.1
μ
F
L2
22 mH
L
N
ST202A REFEREN
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TOP214YN | 功能描述:交流/直流開關轉換器 25-42 W 85-265 VAC 50-85 W 100/115/230 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TOP221-227 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| TOP221G | 功能描述:交流/直流開關轉換器 6W 85-265 VAC 9W100/115/230 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TOP221GN | 功能描述:交流/直流開關轉換器 6W 85-265 VAC 9W100/115/230 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
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