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DI-76 参数 Datasheet PDF下载

DI-76图片预览
型号: DI-76
PDF下载: 下载PDF文件 查看货源
内容描述: 3.1 W¯¯极少的外部元器件电源 [3.1 W Low Parts Count Power Supply]
分类和应用:
文件页数/大小: 2 页 / 286 K
品牌: POWERINT [ POWER INTEGRATIONS, INC. ]
 浏览型号DI-76的Datasheet PDF文件第2页  
Design Idea DI-76
®
LinkSwitch
Application
Appliance/Industrial Control
Device
LNK520P
3.1 W Low Parts Count Power Supply
Power Output
3.1 W
Input Voltage
100-375 VDC
Output Voltage
12 V
Topology
Flyback
Design Highlights
• Replaces a linear transformer based power supply at the
same or lower cost, but with much better performance
• High Efficiency: >75% at >100 mA of load current
• Primary side regulated: requires no optocoupler
• <300 mW no-load power consumption at 375 VDC
• Very low parts count: only 9 components!
• 12 V output: ideal for driving motors, relays, or SCRs
restart (for hard short circuits) and thermal shutdown effectively
produce a very rugged design.
LinkSwitch
derives all feedback information from the primary
side, thus no optocoupler is required. During output diode
(D4) conduction, the output voltage is reflected through the
transformer turns ratio, providing a primary feedback voltage
(V
OR
), which is rectified by diode D3 and held by capacitor C4.
Resistor R3 limits the effects of transformer leakage on the
feedback voltage. Resistor R2 feeds the V
OR
signal as a current
to the CONTROL pin of the
LinkSwitch,
controlling duty cycle
(and primary current limit during overload conditions). When
there is little or no feedback signal (such as a short circuit) the
LinkSwitch
goes into auto-restart, limiting output current to
approximately 40 mA.
Capacitor C3 provides device decoupling. The extra winding
on pin 3 of T1 is a shield that reduces EMI.
Operation
The very low parts count
LinkSwitch
flyback circuit shown
below can be used as a general-purpose power supply or
linear adapter replacement.
The design provides regulated output voltage during normal
loads as well as a soft output-current limit during overload
conditions (such as a stalled motor or defective relay). Adding
to this, the other
LinkSwitch
self-protection features of auto-
LinkSwitch
D
S
C
T1
12 V, 260 mA
+
U1
LNK520
R2
17.8 kΩ
C3
1
µF
10 V
69T
34 AWG
43T
35 AWG
1
5
+
30T
30 AWG
T.I.W.
6
DC IN
100-375
VDC
*C2
100 nF
400 V
D3
1N4937
R3
150
C4
0.1
µF
100 V
FILM
4
C5
220
µF
25 V
3
55T
38 AWG
EE13
Lp = 2.484 mH
PI-3883-070604
D4
UF4003
1A
200 V
RTN
*Optional
Component
Figure 1. DC-Input, Isolated LinkSwitch 3.12 W Flyback Converter.
DI-76
www.powerint.com
July 2004