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参数资料
| 型号： | L6565N |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.7 A SWITCHING CONTROLLER, PDIP8 |
| 封装： | MINI, DIP-8 |
| 文件页数： | 15/17页 |
| 文件大小： | 250K |
| 代理商： | L6565N |
7/17
L6565
APPLICATION INFORMATION
Quasi-resonant operation in offline flyback converters lies in synchronizing MOSFET's turn-on to the transform-
er's demagnetization. Detecting the resulting negative-going edge of the voltage across any winding of the
transformer can do this. The L6565 is provided with a dedicated pin that allows doing the job with a very simple
interface, just one resistor.
Variable frequency operation - as a result of different operating conditions in terms of input voltage and output
current - is inherent in such functionality. The system always works close to the boundary between DCM (Dis-
continuous Conduction Mode) and CCM (Continuous Conduction Mode) operation of the transformer. The op-
eration is then identical to that of the so-called self-oscillating or Ringing Choke Converter (RCC).
Detailed Device Description
Internal Supply Block (see fig. 12)
A linear voltage regulator supplied by Vcc (pin 8) generates an internal 7V rail used for supplying the entire IC,
except for the gate driver that is supplied directly from Vcc. In addition, a bandgap circuit generates a precise
internal reference (2.5V±1% @ 25°C) used by the control loop to ensure a good regulation with primary feed-
back technique.
In figure 12 it is also shown the undervoltage lockout (UVLO) comparator with hysteresis used to enable the
chip as long as the Vcc voltage is high enough to ensure a reliable operation.
Figure 12. L6565 internal supply block
+Vin
REF.
UVLO
-
+
8
2.5V
7V bus
LIN.
REG.
Vcc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6566 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566A | 功能描述:开关变换器、稳压器与控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6566A_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566ATR | 功能描述:开关变换器、稳压器与控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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