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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： | 16/52页 |
| 文件大小： | 457K |
| 代理商： | TOP244PN-TL |
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TOP242-250
23
H
9/02
A High Efficiency, 250 W, 250 – 380 VDC Input Power Supply
The circuit shown in figure 43 delivers 250 W (48 V @ 5.2 A)
at 84% efficiency using a TOP249 from a 250 to 380 VDC
input. DC input is shown, as typically at this power level a
p.f.c. boost stage would preceed this supply, providing the DC
input (C1 is included to provide local decoupling). Flyback
topology is still useable at this power level due to the high
output voltage, keeping the secondary peak currents low enough
so that the output diode and capacitors are reasonably sized.
In this example the TOP249 is at the upper limit of its power
capability and the current limit is set to the internal maximum
by connecting the X pin to SOURCE. However, line sensing
is implemented by connecting a 2 M
resistor from the L pin
to the DC rail. If the DC input rail rises above 450 VDC, then
TOPSwitch-GX will stop switching until the voltage returns to
normal, preventing device damage.
Due to the high primary current, a low leakage inductance
transformer is essential. Therefore, a sandwich winding with
a copper foil secondary was used. Even with this technique
the leakage inductance energy is beyond the power capability
of a simple Zener clamp. Therefore, R2, R3 and C6 are added
in parallel to VR1. These have been sized such that during
normal operation very little power is dissipated by VR1, the
leakage energy instead being dissipated by R2 and R3.
However, VR1 is essential to limit the peak drain voltage
during start-up and/or overload conditions to below the 700 V
rating of the TOPSwitch-GX MOSFET.
The secondary is rectifed and smoothed by D2 and C9, C10
and C11. Three capacitors are used to meet the secondary ripple
current requirement. Inductor L2 and C12 provide switching
noise filtering.
A simple Zener sensing chain regulates the output voltage. The
sum of the voltage drop of VR2, VR3 and VR4 plus the LED
drop of U2 gives the desired output voltage. Resistor R6
limits LED current and sets overall control loop DC gain.
Diode D4 and C14 provide secondary soft-finish, feeding
current into the CONTROL pin prior to output regulation and
thus ensuring that the output voltage reaches regulation at start-
up under low line, full load conditions. Resistor R9 provides a
discharge path for C14. Capacitor C13 and R8 provide control
loop compensation and are required due to the gain associated
with such a high output voltage.
Sufficient heat sinking is required to keep the TOPSwitch-GX
device below 110
°C when operating under full load, low line
and maximum ambient temperature. Airflow may also be
required if a large heat sink area is not acceptable.
Figure 43. 250 W, 48 V Power Supply using TOP249.
48 V @ 5.2 A
+250 - 380 VDC
0V
L
D
SX
F
C
RTN
PI-2692-033001
All resistor 1/8 W 5% unless
otherwise stated.
CONTROL
TOPSwitch-GX
C1
22
F
400 V
C3
0.1
F
50 V
R4
6.8
R6
100
R8
56
R9
10 k
C3
47
F
10 V
C6
4.7 nF
1 kV
C13
150 nF
63 V
C4
1
F
50 V
C14
22
F
63 V
C9
560
F
63 V
C10
560
F
63 V
C11
560
F
63 V
C12
68
F
63 V
C7
2.2 nF Y1
L2
3
H 8A
D2
MUR1640CT
D2
1N4148
U2
LTV817A
D1
BYV26C
T1
R1
2 M
1/2 W
R3
68 k
2 W
R2
68 k
2 W
VR1
P6KE200
VR2 22 V
BZX79B22
VR3 12 V
BZX79B12
VR4 12 V
BZX79B12
CONTROL
D4
1N4148
PERFORMANCE SUMMARY
Output Power:
250 W
Line Regulation:
± 1%
Load Regulation:
± 5%
Efficiency:
≥ 85%
Ripple:
< 100 mV pk-pk
No Load Consumption:
≤ 1.4 W (300 VDC)
TOP249Y
U1
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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