參數(shù)資料
型號(hào)： TDA4605-3
廠商： INFINEON TECHNOLOGIES AG
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 19/23頁(yè)
文件大?。?/td> 746K
代理商： TDA4605-3
Version 2.0
5
1 Jul 2002
TDA 4605-3
Pin Definitions and Functions
Pin No.
Function
1
Information Input Concerning Secondary Voltage. By comparing the
regulating voltage - obtained trom the regulating winding of the transformer - with
the internal reference voltage, the output impulse width on pin 5 is adjusted to the
load of the secondary side (normal, overload, short-circuit, no load).
2
Information Input Regarding the Primary Current. The primary current rise in
the primary winding is simulated at pin 2 as a voltage rise by means of external
RC-element. When a voltage level is reached thats derived from the regulating
voltage at pin 1, the output impulse at pin 5 is terminated. The RC-element serves
to set the maximum power at the overload point set.
3
Input for Primary Voltage Monitoring: In the normal operation
V3 is moving
between the thresholds
V3H and V3L (V3H > V3 > V3L).
V3 < V3L: SMPS is switched OFF (line voltage too low).
V3 > V3H : Compensation of the overload point regulation (controlled by pin 2)
starts at
V3H : V3L = 1.7.
4
Ground
5
Output: Push-pull output provides
± 1 A for rapid charge and discharge of the
gate capacitance of the power MOS-transistor.
6
Supply Voltage Input: A stable internal reference voltage
VREF is derived from
the supply voltage also the switching thresholds
V6A , V6E , V6 max and V6 min for
the supply voltage detector. If
V6 > V6E then VREF is switched on and swiched off
when
V6 < V6A . In addition the logic is only enable for V6 min < V6 < V6 max.
7
Input for Soft-Start. Start-up will begin with short pulses by connecting a
capacitor from pin 7 to ground.
8
Input for the Oscillation Feedback. After starting oscillation, every zero
transition of the feedback voltage (falling edge) through zero (falling edge)
triggers an output pulse at pin 5. The trigger threshold is at + 50 mV typical.
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