- 您現在的位置：買賣IC網 > PDF目錄97995 > L6565N (STMICROELECTRONICS) 0.7 A SWITCHING CONTROLLER, PDIP8 PDF資料下載
參數資料
| 型號： | L6565N |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.7 A SWITCHING CONTROLLER, PDIP8 |
| 封裝： | MINI, DIP-8 |
| 文件頁數： | 3/17頁 |
| 文件大小： | 250K |
| 代理商： | L6565N |
11/17
L6565
Error Amplifier Block (see fig. 17b):
The Error Amplifier (E/A) inverting input is used in primary feedback technique to compare a partition of the volt-
age generated by the auxiliary winding with the internal reference, to achieve converter's output voltage regu-
lation (see "Application Ideas", fig. 24). With secondary feedback (typically using a TL431 at the secondary side
and an optocoupler to transfer output voltage information to the primary side through the isolation barrier) the
E/A can be used as an inverting level-shifter to achieve negative feedback and shape the loop gain (see "Ap-
plication Ideas", fig. 23).
The E/A output is used typically for control loop compensation, realized with an RC network connected to the
inverting input. With other secondary feedback techniques, the output is driven directly by an emitter-grounded
optocoupler to modulate the duty cycle (the inverting input will be grounded in that case - see figure 23 in "Ap-
plication Ideas").
Current Comparator, PWM Latch and Hiccup-mode OCP (see fig. 17b):
The current comparator senses the voltage across the current sense resistor (Rs) and, by comparing it with the
programming signal delivered by the feedforward block, determines the exact time when the external MOSFET
is to be switched off. The PWM latch avoids spurious switching of the MOSFET, which might result from the
noise generated ("double-pulse suppression").
A comparator senses the voltage on the current sense input and disables the gate driver if the voltage at the pin
exceeds 2 V. Such anomalous condition is typically generated by a short circuit on the secondary rectifier or on
the secondary winding. To re-enable the driver, first the IC must be turned off and then can be restarted, that is
the Vcc voltage must fall below the UVLO threshold.
When the gate driver is disabled the quiescent current of the IC is unchanged and, since no energy is coming
from the self-supply circuit, the Vcc capacitor will be discharged below the UVLO threshold after some time.
Then the device will initiate a new start-up cycle. In case of failure of the secondary diode the resulting behavior
will be a low-frequency intermittent operation (Hiccup-mode operation), with very low stress on the power circuit.
Gate Driver (see fig. 18):
A totem pole buffer, with 400mA source and sink capability, drives the external MOSFET. It is made up of a
high-side NPN Darlington and a low-side MOSFET. In this way there is no need of an external diode clamp to
prevent the voltage at the gate drive output (pin 7, GD) from being pulled too negative.
An internal pull-down circuit holds the output low when the device is in UVLO conditions, to ensure that the ex-
ternal MOSFET cannot be turned on accidentally (e.g. at power-on).
Figure 18. Gate driver with UVLO pull-down
7
6
8
GD
UVLO
GND
DRIVER
Vcc
Q
L6565
相關PDF資料 |
PDF描述 |
|---|---|
| L6615N | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| L6711TR | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| L6711 | 2 A SWITCHING CONTROLLER, 178 kHz SWITCHING FREQ-MAX, PQFP48 |
| L6714TR | SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64 |
| L6714 | SWITCHING CONTROLLER, 170 kHz SWITCHING FREQ-MAX, PQFP64 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| L6566 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566A | 功能描述:開關變換器、穩(wěn)壓器與控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6566A_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566ATR | 功能描述:開關變換器、穩(wěn)壓器與控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。