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參數資料
| 型號： | TOP234Y |
| 英文描述： | 0-75 W Flyback design energy efficient |
| 中文描述： | 0-75糯反激式設計節能 |
| 文件頁數： | 14/36頁 |
| 文件大小： | 650K |
| 代理商： | TOP234Y |
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TOP232-234
14
B
7/01
Figure 24. 30 W Power Supply using External Current Limit.
Application Examples
A High Efficiency, 30 W, Universal Input Power Supply
The circuit shown in Figure 24 takes advantage of several of the
TOPSwitch-FX
features to reduce system cost and power supply
size and to improve efficiency. This design delivers 30 W at
12 V, from an 85 to 265 VAC input, at an ambient of 50
C, in
an open frame configuration. A nominal efficiency of 80% at
full load is achieved using TOP234.
The current limit is externally set by resistors R1 and R2 to a
value just above the low line operating peak current of
approximately 70% of the default current limit. This allows use
of a smaller transformer core size and/or higher transformer
primary inductance for a given output power, reducing
TOPSwitch-FX
power dissipation, while at the same time
avoiding transformer core saturation during startup and output
transient conditions. The resistor R1 provides a feed forward
signal that reduces the current limit with increasing line voltage,
which, in turn, limits the maximum overload power at high
input line voltage. The feed forward function in combination
with the built-in soft-start feature of
TOPSwitch-FX
, allows the
use of a low cost RCD clamp (R3, C3 and D1) with a higher
reflected voltage, by safely limiting the
TOPSwitch-FX
drain
voltage, with adequate margin, under worst case conditions.
The extended maximum duty cycle feature of
TOPSwitch-FX
(guaranteed minimum value of 75% vs. 64% for
TOPSwitch-II
)
allows the use of a smaller input capacitor (C1). The extended
maximum duty cycle and the higher reflected voltage possible
with the RCD clamp also permit the use of a higher primary to
secondary turns ratio for T1 which reduces the peak reverse
voltage experienced by the secondary rectifier D8. As a result,
a 60 V Schottky rectifier can be used for up to 15 V outputs,
which greatly improves power supply efficiency. The cycle
skipping feature of the
TOPSwitch-FX
eliminates the need for
any dummy loading for regulation at no load and reduces the no
load/standby consumption of the power supply. Frequency
jitter provides improved margin for conducted EMI meeting the
CISPR 22 (FCC B) specification.
A simple Zener sense circuit is used for low cost. The output
voltage is determined by the Zener diode (VR2) voltage and the
voltage drops across the optocoupler (U2) LED and resistor R6.
Resistor R8 provides bias current to Zener VR2 for typical
regulation of
±
5% at the 12 V output level, over line and load
and component variations.
12 V
@ 2.5 A
D2
1N4148
T1
C5
47
μ
F
10 V
U2
LTV817A
VR2
1N5240C
10 V, 2%
R6
150
R15
150
C14
1 nF
D1
UF4005
R3
68 k
2W
C3
4.7 nF
1KV
CY1
2.2 nF
U1
TOP234Y
D
M
S
F
C
TOPSwitch-FX
R8
150
C1
68
μ
F
400 V
C6
100 nF
D8
MBR1060
C10
560
μ
F
35 V
C12
220
μ
F
35 V
C11
560
μ
F
35 V
CONTROL
RTN
R5
6.8
R1
4.7 M
1/2 W
R2
9.09 k
PI-2525-040401
L3
3.3
μ
H
BR1
600 V
2A
F1
3.15 A
J1
L1
20 mH
L
N
CX1
100 nF
250 VAC
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TOP234YN | 功能描述:交流/直流開關轉換器 45W 85-265 VAC 75W 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 |
| TOP242 | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:Family Extended Power, Design Flexible,Integrated Off-line Switcher |
| TOP242-249 | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:Family Extended Power, Design Flexible,Integrated Off-line Switcher |
| TOP242-250 | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP242F | 功能描述:IC OFFLINE SWIT UVLO HV TO262 RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉換器，離線開關 系列:TOPSwitch®-GX 標準包裝: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） 供應商設備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
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