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參數(shù)資料
| 型號： | TDA4605 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 17/21頁 |
| 文件大小： | 631K |
| 代理商： | TDA4605 |
Semiconductor Group
37
TDA 4605
Circuit Description
Application Circuit
Application circuit shows a flyback converter for video recorders with a power rating of 50 W. The
circuit is designed as a wide-range power supply tor AC-line voltages ot 90 to 270 V. The AC-input
voltage is rectified by bridge rectifier GR1 and smoothed by
C1 . The NTC limits the rush in current.
In the period before the switch-on threshold is reached the IC is supplied via resistor
R 1 ; during the
start-up phase it uses the energy stored in
C2 , under steady-state conditions the IC receives its
supply voltage from transformer winding
n1 via diode D1. The switching transistor T1 is a BUZ 90.
The parallel-connected capacitor
C3 and the inductance ot primary winding 112 determine the
system resonance frequency. The R 2 - C4 - D2 circuitry limits overshoot peaks, and R 3 protects the
gate of T1 against static charges.
While T1 conducts, the current rise in the primary winding depends on the winding’s inductance
and the
VC1 voltage. A voltage reproduction ot the current rise is tabbed using the R4 - C5 network
and forwarded into pin 2 ot the IC. The RC-time constant ot
R 4 , R 5 must be dimensioned correctly
in order to prevent driving the transformer core into saturation.
The
R 10/R 11 divider ratio provides the line voltage threshold controlling the undervoltage control
circuit in the IC. The voltage present at pin 3 also determines the overload. Detection of overload
together with the current characteristic at pin 2 controls the on period ot T1. This keeps the cut-off
point stable even with higher AC-line voltages.
Regulation of the switched-mode power supply is via pin 1. The control voltage of winding
n1 during
the off-period of T1 is rectified by D3, smoothed by C6 and stepped down at an adjustable ratio by
R 5 , R 6 and R 7 . The R 6 - C7 network suppresses parasitic overshoots (transformer oscillation).
The peak voltage at pin 2, and thus the primary peak current, is adjusted by the IC so that the
voltage applied across the control winding, and hence the output voltages, are at the desired level.
When the transformer has supplied its energy to the load, the control voltage passes through zero.
The IC detects the zero crossing via series resistors
R 9 connected to pin 8. But zero crossings are
also produced by transformer oscillation after T1 has turned off if output is short-circuited. Therefore
the IC ignores zero crossings occurring within a specitied period of time after T1 turn-off.
The capacitor
C8 connected to pin 7 causes the power supply to be started with shorter pulses to
keep the operating ftrequency outside the audible range during start-up.
On the secondary side, tive output voltages are produced across winding
n3 to n7 rectified by D4 to
D8 and smoothed by
C9 to C13 . Resistors R 12 , R 14 and R 19 to R 21 are used as bleeder resistors.
Fusable resistors
R 15 to R 18 protect the rectifiers against short circuits in the output circuits, which
are designed to supply only small loads.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA4605_03 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS |
| TDA46052 | 功能描述:開關變換器、穩(wěn)壓器與控制器 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 |
| TDA4605-2 | 功能描述:軟開關 PWM 控制器 CTRL IC FOR SWITCH MODE PWR SUPPLIES RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開關頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| TDA46052HKLA1 | 制造商:Infineon Technologies AG 功能描述:Controller Switch Mode Power Supply 8-Pin PDIP 制造商:Infineon Technologies AG 功能描述:IC POWER SUPPLY CONTROLLER 8DIP |
| TDA46053 | 功能描述:開關變換器、穩(wěn)壓器與控制器 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 |
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