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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)： | 6/20頁 |
| 文件大?。?/td> | 158K |
| 代理商： | TDA8380 |
November 1993
6
Philips Semiconductors
Product specification
Control circuit for switched mode power supplies
TDA8380A
Reference block
A bandgap based reference generates a stabilized voltage of 7 V to supply most of the device’s internal circuits, this
decreases chip size and increases reliability. The only circuits connected to V
CC
are:
The initialization circuit
The output circuitry
The series transistor of the stabilized voltage
By means of a resistor (R
6
) connected to the I
ref
input a reference current is defined which determines six other device
settings.
Part of the reference current is used to charge the oscillator capacitor (C
10
), therefore, the charging time is proportional
to R
6
×
C
10
. The maximum duty factor (D
max
) is set by the resistor connected to pin 12 (R
12
) and is defined by the ratio
R
6
/R
12
. The minimum supply voltage (pin 5) set by the resistor (R
4
) at input V
CCmin
is defined by: 4/6
×
V
6
×
R
4
/R
6
.
Oscillator
The oscillator capacitor is charged and discharged between the high and low voltage levels as defined by the bandgap
reference (high voltage typically 5 V and low voltage typically 1.4 V). The charge current is 1/6 of the reference current,
the discharge current having the same value as the reference current. The period is therefore defined by 10
×
R
6
×
C
10
.
The oscillator flyback pulse is used to set the bistable in the output logic, however the output remains low until the positive
ramp starts (see Fig.4). The oscillator can be synchronized by means of the SYNC pin. When this pin is connected to
V
CC
, the oscillator is free running. When it is between 0.85 and 5.6 V, the oscillator stops at the low voltage level prior to
the next positive ramp.
Fig.4 Oscillator levels.
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相關代理商/技術參數(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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