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参数资料
| 型号： | L6566A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, SOP-16 |
| 文件页数： | 51/51页 |
| 文件大小： | 646K |
| 代理商： | L6566A |
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L6566A
Pin settings
9/51
5Vcc
Supply voltage of both the signal part of the IC and the gate driver. The internal
high voltage generator charges an electrolytic capacitor connected between this
pin and GND (pin 3) as long as the voltage on the pin is below the turn-on threshold
of the IC, after that it is disabled and the chip is turned on. The IC is disabled as the
voltage on the pin falls below the UVLO threshold. This threshold is reduced at light
load to counteract the natural reduction of the self-supply voltage. Sometimes a
small bypass capacitor (0.1 F typ.) to GND might be useful to get a clean bias
voltage for the signal part of the IC.
6Vcc_PFC
Supply pin output. This pin is intended for supplying the PFC controller IC in
systems comprising a PFC pre-regulator or other compatible circuitry. It is internally
connected to the Vcc pin (5) via a controlled switch. The switch is closed as the IC
starts up and opens when the voltage at pin COMP is lower than a threshold (light
load), whenever the IC is shut down (either latched or not) and during UVLO. If not
used, the pin will be left floating.
7CS
Input to the PWM comparator. The current flowing in the MOSFET is sensed
through a resistor, the resulting voltage is applied to this pin and compared with an
internal reference to determine MOSFET’s turn-off. The pin is equipped with 150 ns
min. blanking time after the gate-drive output goes high for improved noise
immunity. A second comparison level located at 1.5 V latches the device off and
reduces its consumption in case of transformer saturation or secondary diode short
circuit. The information is latched until the voltage on the Vcc pin (5) goes below
the UVLO threshold, hence resulting in intermittent operation. A logic circuit
improves sensitivity to temporary disturbances.
8DIS
IC’s latched disable input. Internally the pin connects a comparator that, when the
voltage on the pin exceeds 4.5 V, latches off the IC and brings its consumption to a
lower value. The latch is cleared as the voltage on the Vcc pin (5) goes below the
UVLO threshold, but the HV generator keeps the Vcc voltage high (see pin 1
description). It is then necessary to recycle the input power to restart the IC. For a
quick restart pull pin 16 (AC_OK) below the disable threshold (see pin 16
description). Bypass the pin with a capacitor to GND (pin 3) to reduce noise pick-
up. Ground the pin if the function is not used.
9COMP
Control input for loop regulation. The pin will be driven by the phototransistor
(emitter-grounded) of an optocoupler to modulate its voltage by modulating the
current sunk. A capacitor placed between the pin and GND (3), as close to the IC
as possible to reduce noise pick-up, sets a pole in the output-to-control transfer
function. The dynamics of the pin is in the 2.5 to 5 V range. A voltage below an
internally defined threshold activates burst-mode operation. The voltage at the pin
is bottom-clamped at about 2 V. If the clamp is externally overridden and the
voltage is pulled below 1.4 V the IC will shut down.
10
VREF
An internal generator furnishes an accurate voltage reference (5 V ± 2 %) that can
be used to supply few mA to an external circuit. A small film capacitor (0.1 F typ.),
connected between this pin and GND (3), is recommended to ensure the stability of
the generator and to prevent noise from affecting the reference. This reference is
internally monitored by a separate auxiliary reference and any failure or drift will
cause the IC to latch off.
Table 1.
Pin functions (continued)
N°
Pin
Function
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| L6566B | 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 |
| L6566B_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multi-mode controller for SMPS |
| L6566BH | 功能描述:电流型 PWM 控制器 Multimode Controller SMPS 800V <3mA RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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