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TDA4605 датащи(PDF) 2 Page - STMicroelectronics

номер детали TDA4605
подробное описание детали  CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS
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производитель  STMICROELECTRONICS [STMicroelectronics]
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TDA4605
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PIN CONFIGURATION
Figure 2. Block Diagram
Pin
Number
Description
1
Regulating voltage : information input concerning secondary voltage.
By comparing the regulating voltage obtained from the regulating winding of the transformer with the
internal reference voltage, the output pulse width on Pin 5 is adapted to the load of the secondary side
(normal, overload, short circuit, no load)
2
Primary current simulation : 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 value is
reached that is derived from the regulating voltage at Pin 1, the output pulse at Pin 5 is terminated. The RC
element serves to set the maximum power at the overload point.
3
Primary voltage detector : input for primary voltage monitoring. When the line voltage is too low the IC is
switched-off by comparing V3 with an internal reference. Voltage at Pin 3 is used for overload point
compensation.
4
Ground
5
Output : push-pull output for charge and discharge of the gate capacitance of the power MOS transistor.
6
Supply voltage : Supply voltage input. From it are derived a stable internal reference voltage (VREF) and the
switching threshold V6A, V6E, V6 max and V6 min for the supply voltage detector.
if V6 > V6E the VREF is switched on and switched off when V6 < V6A. In addition the logic is only enable for
V6 min < V6 < V6 max.
7
Soft-start : input for soft-start and integration network. Start-up will begin with short pulses by connecting a
capacitor between Pin 7 to ground. This capacitor together with a resistor connected between Pin 7 and
error amplifier output also as acts an integrator network for regulation.
8
Zero detector : Input for the oscillator feedback. After starting oscillator, every zero transit of the feedback
voltage (falling edge) triggers an output pulse at Pin 5. The trigger threshold is at typically - 50mV
1
2
3
4
5
6
7
8
V6min
V6max
V6E
V6A
V2B
Vst
VR
Vu
VREF
Reference
Voltage
(typ. 3V)
Supply
Voltage
Monitor
Primary
Current
Recopy
Output Stage
and
Current Limit
Logic
Starting
Impulse
Generator
Regulating
& Overload
Amplifier
Current
Source
Overload
Point
Correction
Low Voltage
Protection
Monitoring
Stop
Comp.
Zero
Crossing
Detector
TDA4605
1


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