参数资料
| 型号： | LNK501P |
| 厂商： | Power Integrations |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC SWIT OCP CV/CC HV 8DIP |
| 标准包装： | 3,000 |
| 系列： | LinkSwitch® |
| 输出隔离： | 隔离 |
| 频率范围： | 26kHz ~ 46kHz |
| 输出电压： | 700V |
| 功率（瓦特）： | 4W |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm），7 引线 |
| 供应商设备封装： | DIP-8B |
| 包装： | 管件 |
| 配用： | 596-1001-ND - KIT DESIGN ACCELERATOR ADAPTER |
LNK501
LinkSwitch Functional Description
INTERNAL CURRENT LIMIT
The duty cycle, current limit and operating frequency
relationships with CONTROL pin current are shown in
Figure 4. Figure 5 shows a typical power supply outline
schematic which is used below to describe the LinkSwitch
operation.
I LIM
AUTO-RESTART
Power Up
During power up, as V IN is ?rst applied (Figure 5), the CONTROL
pin capacitor C1 is charged through a switched high voltage
current source connected internally between the DRAIN and
CONTROL pins (see Figure 2). When the CONTROL pin
voltage reaches approximately 5.6 V relative to the SOURCE
pin, the high voltage current source is turned off, the internal
control circuitry is activated and the high voltage internal
MOSFET starts to switch. At this point, the charge stored on
C1 is used to supply the internal consumption of the chip.
CONTROL CURRENT I C
DUTY CYCLE
AUTO-RESTART
77%
I DCT
Constant Current (CC) Operation
As the output voltage, and therefore the re?ected voltage
across the primary transformer winding ramp up, the feedback
CONTROL current I C increases. As shown in Figure 4, the
internal current limit increases with I C and reaches I LIM when I C
is equal to I DCT . The internal current limit vs. I C characteristic
is designed to provide an approximately constant power supply
output current as the power supply output voltage rises.
30%
3.8%
FREQUENCY
I CD1
CONTROL CURRENT I C
I DCS
Constant Voltage (CV) Operation
When I C exceeds I DCS , typically 2 mA (Figure 4), the maximum
duty cycle is reduced. At a value of I C that depends on power
supply input voltage, the duty cycle control limits LinkSwitch
peak current below the internal current limit value. At this point
the power supply transitions from CC to CV operation. With
minimum input voltage in a typical universal input design, this
transition occurs at approximately 30% duty cycle. Resistor R1
(Figure 5) is therefore initially selected to conduct a value of I C
approximately equal to I DCT when V OUT is at the desired value
at the minimum power supply input voltage. The ?nal choice
of R1 is made when the rest of the circuit design is complete.
When the duty cycle drops below approximately 4%, the
frequency is reduced, which reduces energy consumption under
light load conditions.
AUTO-RESTART
F OSC
F OSC(LOW)
CONTROL CURRENT I C
Figure 4. CONTROL Characteristics.
LinkSwitch
PI-2799-112102
Auto-Restart Operation
When a fault condition, such as an output short circuit or open
loop, prevents ?ow of an external current into the CONTROL
pin, the capacitor C1 discharges towards 4.7 V. At 4.7 V, auto-
restart is activated, which turns the MOSFET off and puts the
control circuitry in a low current fault protection mode. In
auto-restart, LinkSwitch periodically restarts the power supply
so that normal power supply operation can be restored when
the fault is removed.
V IN
D
C
S
C1
R1
D1
R2
C2
C4 V OUT
D2
PI-2715-112102
Figure 5. Power Supply Outline Schematic.
I
2/05
3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LNK501P_1 | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:2.2W Cell Phone Charger |
| LNK501PN | 功能描述:交流/直流开关转换器 3W 85-265 VAC 4W 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 |
| LNK520 | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Energy Efficient, CV or CV/CC Switcher for Very Low Cost Adapters and Chargers |
| LNK520G | 功能描述:IC SWIT OCP CV/CC HV 8SMD RoHS:否 类别:集成电路 (IC) >> PMIC - AC-DC 转换器，离线开关 系列:LinkSwitch® 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 |
| LNK520GN | 功能描述:交流/直流开关转换器 3W 85-265 VAC 4W 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 |
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