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PDF ( 数据手册 , 数据表 ) TDA-4605-3

零件编号 TDA-4605-3
描述 Control IC for Switched-Mode Power Supplies using MOS-Transistor
制造商 Siemens Semiconductor
LOGO Siemens Semiconductor LOGO 


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TDA-4605-3 数据手册, 描述, 功能
Control IC for Switched-Mode Power Supplies
using MOS-Transistor
TDA 4605-3
Bipolar IC
Features
q Fold-back characteristics provides overload protection for
external components
q Burst operation under secondary short-circuit condition
implemented
q Protection against open or a short of the control loop
q Switch-off if line voltage is too low (undervoltage switch-off)
q Line voltage depending compensation of fold-back point
q Soft-start for quiet start-up without noise generated by the
transformer
q Chip-over temperature protection implemented (thermal
shutdown)
q On-chip ringing suppression circuit against parasitic
oscillations of the transformer
q AGC-voltage reduction at low load
P-DIP-8-1
Type
TDA 4605-3
Ordering Code
Q67000-A5066
Package
P-DIP-8-1
The IC TDA 4605-3 controls the MOS-power transistor and performs all necessary control and
protection functions in free running flyback converters. Because of the fact that a wide load range
is achieved, this IC is applicable for consumer as well as industrial power supplies.
The serial circuit and primary winding of the flyback transformer are connected in series to the input
voltage. During the switch-on period of the transistor, energy is stored in the transformer. During the
switch-off period the energy is fed to the load via the secondary winding. By varying switch-on time
of the power transistor, the IC controls each portion of energy transferred to the secondary side
such that the output voltage remains nearly independent of load variations. The required control
information is taken from the input voltage during the switch-on period and from a regulation winding
during the switch-off period. A new cycle will start if the transformer has transferred the stored
energy completely into the load.
Semiconductor Group
74
06.94







TDA-4605-3 pdf, 数据表
TDA 4605-3
Regulation, Overload and No-Load Behaviour
When the IC has started up, it is operating in the regulation range. The potential at pin 1 typically is
400 mV. If the output is loaded, the regulation amplifier allows broader impulses (V5 = H). The peak
voltage value at pin 2 increases up to V2S max . If the secondary load is further increased, the
overload amplifier begins to regulate the pulse width downward. This point is referred to as the
overload point of the power supply. As the IC-supply voltage V6 is directly proportional to the
secondary voltage, it goes down in accordance with the overload regulation behaviour. If V6 falls
below the value V6 min , the IC goes into burst operation. As the time constant of the half-wave
charge-up is relatively large, the short-circuit power remains small. The overload amplifier cuts back
to the pulse width tpk . This pulse width must remain possible, in order to permit the IC to start-up
without problems from the virtual short-circuit, which every switching on with V1 = 0 represents. If
the secondary side is unloaded, the loading impulses (V5 = H) become shorter. The frequency
increases up to the resonance frequency of the system. If the load is further reduced, the secondary
voltages and V6 increase. When V6 = V6 max the logic is blocked. The IC converts to burst
operation.This renders the circuit absolutely safe under no-load conditions.
Behaviour when Temperature Exceeds Limit
An integrated temperature protection disables the logic when the chip temperature becomes too
high. The IC automatically interrogates the temperature and starts as soon as the temperature
decreases to permissible values.
Semiconductor Group
81







TDA-4605-3 equivalent, schematic
TDA 4605-3
Semiconductor Group
89










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