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参数资料
| 型号： | TOP242G-TL |
| 厂商： | POWER INTEGRATIONS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.72 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PDSO7 |
| 封装： | PLASTIC, SMD-8/7 |
| 文件页数： | 14/52页 |
| 文件大小： | 2175K |
| 代理商： | TOP242G-TL |
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TOP242-250
21
N
4/05
increase efciency. This design delivers 70 W at 19 V, from an
85 VAC to 265 VAC input, at an ambient of 40 °C, in a small
sealed adapter case (4” x 2.15” x 1”). Full load efciency is
85% at 85 VAC rising to 90% at 230 VAC input.
Due to the thermal environment of a sealed adapter, aTOP249Y
is used to minimize device dissipation. Resistors R9 and R10
externally program the current limit level to just above the
operating peak DRAIN current at full load and low line. This
allows the use of a smaller transformer core size without
saturation during startup or output load transients. Resistors
R9 and R10 also reduce the current limit with increasing line
voltage, limiting the maximum overload power at high input
line voltage, removing the need for any protection circuitry on
the secondary. Resistor R11 implements an under-voltage and
overvoltage sense as well as providing line feed-forward for
reduced output line frequency ripple. With resistor R11 set at
2 M, the power supply does not start operating until the DC
rail voltage reaches 100 VDC. On removal of the AC input,
the UV sense prevents the output glitching as C1 discharges,
turning off the TOPSwitch-GX when the output regulation is
lost or when the input voltage falls to below 40 V, whichever
occurs rst. This same value of R11 sets the OV threshold to
450 V. If exceeded, for example during a line surge,
TOPSwitch-GX
stops switching for the duration of the surge,
extending the high voltage withstand to 700 V without device
damage. Capacitor C11 has been added in parallel with VR1 to
reduce Zener clamp dissipation. With a switching frequency of
132 kHz, a PQ26/20 core can be used to provide 70 W. To
maximize efciency, by reducing winding losses, two output
windings are used each with their own dual 100 V Schottky
rectier (D2 and D3). The frequency reduction feature of the
TOPSwitch-GX
eliminates any dummy loading to maintain
regulation at no load and reduces the no-load consumption of
the power supply to only 520 mW at 230 VAC input. Frequency
jittering provides conducted EMI meeting the CISPR 22
(FCCB)/EN55022Bspecication,usingsimpleltercomponents
(C7, L2, L3 and C6), even with the output earth grounded.
To regulate the output, an optocoupler (U2) is used with a
secondary reference sensing the output voltage via a resistor
divider (U3, R4, R5, R6). Diode D4 and C15 lter and smooth
the output of the bias winding. Capacitor C15 (1 F) prevents
the bias voltage from falling during zero to full load transients.
Resistor R8 provides ltering of leakage inductance spikes,
keeping the bias voltage constant even at high output loads.
Resistor R7, C9 and C10 together with C5 and R3 provide
loop compensation.
Due to the large primary currents, all the small signal control
components are connected to a separate source node that is
Kelvin connected to the SOURCE pin of the TOPSwitch-GX.
For improved common-mode surge immunity, the bias winding
common returns directly to the DC bulk capacitor (C1).
19 V
@ 3.6 A
TOP249Y
U1
U3
TL431
U2
PC817A
D
L
S
X
F
C
RTN
L2
820
H
2A
C6
0.1
F
X2
F1
3.15 A
85-265
VAC
BR1
RS805
8A 600 V
L3
75
H
2A
t
°
T1
C13
0.33
F
400 V
C12
0.022
F
400 V
C11
0.01
F
400 V
RT1
10
1.7 A
PI-2691-042203
All resistors 1/8 W 5% unless otherwise stated.
J1
L
N
CONTROL
TOPSwitch-GX
C1
150
F
400 V
PERFORMANCE SUMMARY
Output Power:
70 W
Regulation:
± 4%
Efficiency:
≥ 84%
Ripple:
≤ 120 mV pk-pk
No Load Consumption:
< 0.52 W @ 230 VAC
C5
47
F
16 V
C3
820
F
25 V
L1
200
H
C2
820
F
25 V
C14
0.1
F
50 V
C4
820
F
25 V
C10
0.1
F
50 V
C9
4.7 nF 50 V
C8
0.1
F
50 V
VR1
P6KE-
200
D2
MBR20100
C7 2.2 nF
Y1 Safety
D3
MBR20100
D4
1N4148
R11
2 M
1/2 W
R9
13 M
R8
4.7
R1
270
R2
1 k
R5
562
1%
R4
31.6 k
1%
R7
56 k
R10
20.5 k
R3
6.8
R6
4.75 k
1%
C15
1
F
50 V
D1
UF4006
Figure 42. 70 W Power Supply using Current Limit Reduction with Line and Line Sensing for UV and OV.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TOP242P | 功能描述:IC OFFLINE SWIT OVP UVLO HV 8DIP RoHS:否 类别:集成电路 (IC) >> PMIC - AC-DC 转换器，离线开关 系列:TOPSwitch®-GX 标准包装:1 系列:FPS™ 输出隔离:隔离 频率范围:61kHz ~ 73kHz 输入电压:8 V ~ 26 V 输出电压:650V 功率（瓦特）:12W 工作温度:-40°C ~ 115°C 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-MDIP 包装:Digi-Reel® 其它名称:FSL206MRBNFSDKR |
| TOP242P- | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP242P/G | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Up to 290 W Extended power. design flexible. |
| TOP242PN | 功能描述:交流/直流开关转换器 10W 85-265 VAC 15W 230 VAC RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压（最大值）:23.5 V 输入/电源电压（最小值）:11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel |
| TOP242PN- | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
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