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參數(shù)資料
| 型號： | TDA8380 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Control circuit for switched mode power supplies |
| 中文描述： | 2.5 A SWITCHING CONTROLLER, 100 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 158K |
| 代理商： | TDA8380 |
November 1993
5
Philips Semiconductors
Product specification
Control circuit for switched mode power supplies
TDA8380A
FUNCTIONAL DESCRIPTION
The TDA8380A is a control circuit which generates the pulses required to drive the switching transistor in a switched
mode power supply (SMPS).
Supply
This device is intended to be used on the primary side of the power supply and can be supplied via a take-over (auxiliary)
winding on the transformer.
The device is initialized via a high value resistor connected between the rectified mains voltage and the device’s supply
pin (pin 5), which causes the capacitor connected to this pin to charge slowly. When the voltage exceeds the initialization
level (typically 17 V) the device will start up and the duty cycle will be slowly increased by the slow-start circuit. After a
short period the take-over winding will supply the device. The value of the resistor is normally defined by the time taken
to charge the capacitor.
A one second delay between switching on and operation of the power supply is acceptable in most cases.
The operating voltage range is from 9 to 20 V. The supply pin is protected by a 23 V Zener diode. The supply protection
circuit is activated once the Zener diode is conducting. The slow-start procedure begins after initialization, until then the
output is off. The current drawn by the device during the initialization period is less than 150
μ
A.
When the supply voltage falls below the minimum trip level, the device switches off and the start-up procedure is
repeated. The minimum voltage supply threshold setting (V
CCmin
) can be set externally with a resistor connected between
the V
CCmin
pin (pin 4) and ground (pin 14) (see Fig.3).
V
CCmin
can be set between 8.4 V (an internally fixed overriding protection level) and 17 V by means of an external resistor
connected to pin 4.
When choosing the initialization and minimum supply voltages the following should be taken into account:
The difference between the two voltages should be large enough to enable a supply voltage dip during start-up.
The value of the minimum supply voltage should be high enough to ensure that the high-voltage transistor is correctly
driven. A high protection level makes it possible to have a large resistor value in series with the base drive.
For battery line input operation, the V
CCmin
pin is connected to V
CC
, the start-up circuit is then inhibited and the device
starts operating when V
CC
exceeds the 8.4 V protection level (this level has a hysteresis of approximately 50 mV). The
device draws current continuously under these conditions.
Fig.3 Trip level setting of minimum V
CC
protection level.
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| TDA8380A | Control circuit for switched mode power supplies |
| TDA8385 | Control circuit for a Self-Oscillating Power Supply SOPS |
| TDA8395 | SECAM decoder |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA8380A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Control circuit for switched mode power supplies |
| TDA8385 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Control circuit for a Self-Oscillating Power Supply SOPS |
| TDA8390 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:PAL DECODER AND RGB MATRIX |
| TDA8391 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:One-chip PAL decoder and RGB matrix |
| TDA8395 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:SECAM decoder |
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