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参数资料
| 型号： | TOP244PN-TL |
| 厂商： | POWER INTEGRATIONS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.16 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PDIP7 |
| 封装： | PLASTIC, DIP-8/7 |
| 文件页数： | 15/52页 |
| 文件大小： | 457K |
| 代理商： | TOP244PN-TL |
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TOP242-250
22
H
9/02
General Information & Table of Contents
Product Selector Guide
1
Data Sheets
2
Application Notes
3
Design Ideas
4
Design Tools
5
Quality and Reliability
6
Package Information
7
DPA-Switch DC-DC Seminar
8
LinkSwitch & TinySwitch-II AC-DC Seminar
9
TOPSwitch-GX AC-DC Seminar 10
Sales Representatives and Distributors 11
A High Efficiency, Enclosed, 70 W, Universal Adapter Supply
The circuit shown in figure 42 takes advantage of several of the
TOPSwitch-GX features to reduce cost, power supply size and
increase efficiency. This design delivers 70 W at 19 V, from an
85 to 265 VAC input, at an ambient of 40
°C, in a small sealed
adapter case (4” x 2.15” x 1”). Full load efficiency is 85% at 85
VAC rising to 90% at 230 VAC input.
Due to the thermal environment of a sealed adapter a TOP249Y
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
over voltage 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 first. 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
Figure 42. 70 W Power Supply using Current Limit Reduction with Line and Line Sensing for UV and OV.
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 efficiency, by reducing winding losses, two output
windings are used each with their own dual 100 V Schottky
rectifier (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
(FCC B) / EN55022B specification, using simple filter compo-
nents (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 filter 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 filtering 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 re-
turns directly to the DC bulk capacitor (C1).
19 V
@ 3.6 A
TOP249Y
U1
U3
TL431
U2
PC817A
DL
SX
F
C
RTN
L2
820 H
2 A
C6
0.1 F
X2
F1
3.15 A
85-265
VAC
BR1
RS805
8 A 600 V
L3
75 H
2 A
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-2691-033001
J1
L
N
CONTROL
TOPSwitch-GX
C1
150 F
400 V
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
R13
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
PERFORMANCE SUMMARY
Output Power:
70 W
Regulation:
± 4%
Efficiency:
≥ 84%
Ripple:
< 120 mV pk-pk
No Load Consumption: < 0.52 W @ 230 VAC
相关PDF资料 |
PDF描述 |
|---|---|
| TOP250YN-TL | 10.08 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PZFM6 |
| TOP244RN-TL | 2.16 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PSSO6 |
| TOP244Y-TL | 2.16 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PZFM6 |
| TOP246Y-TL | 4.32 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PZFM6 |
| TOP245YN-TL | 2.88 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PZFM6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TOP244P-TL | 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 |
| TOP244R | 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 |
| TOP244R- | 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 |
| TOP244RN- | 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 |
| TOP244RN-TL | 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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