TDA4605
Control IC for Switched-Mode Power Supplies using MOS-Transistors

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The IC TDA 4605-1 controls the MOS-power transistor and performs all necessary regulation and monitoring functions in free running flyback converters. Since good load regulation over a wide load range is attained, this IC is applicable tor consumer and industrial power supplies.

The serial circuit of power transistor and primary winding of the flyback transformer is connected to the input voltage. During the switch - on period of the transistor, energy is stored in the transformer and during the switch - off period it is fed to the load via the secondary winding. By varying switchon 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 ot 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.

Parameter Symbol Limit Values Unit Remarks
min. max.
Voltages pin 1
pin 2
pin 3
pin 5
pin 6
pin 7
V1
V2
V3
V5
V6
V7
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
3
V6
20
6
V
V
V
V
V
V
Supply voltage
Currents pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
pin 8
V1
V2
V3
V4
V5
V6
V7
V8
– 1.5
– 1.5
– 3
3
3
3
1.5
1.5
3
3
mA
mA
mA
A
A
A
mA
mA
tp ≤ 50 μs; v ≤ 0.1*)
tp ≤ 50 μs; v ≤ 0.1
tp ≤ 50 μs; v ≤ 0.1
Junction temperature Tj   125  
Storage temperature Tstg – 40 125  
· Fold-back characteristic provides overload protection for external components
· Burst operation under short-circuit conditions
· Loop error protection
· Switch-off if line voltage is too low (undervoltage switch-off)
· Line voltage compensation of overload point
· Soft-start for quiet start-up
· Chip-over temperature protection (thermal shutdown)
· On-chip parasitic transformer oscillation suppression circuitry

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Datasheet

Size: 631.63KB
Page: 21
PDF: TDA4605.pdf
  • Description:
    Control IC for Switched-Mode Power Supplies using MOS-Transistors
  • MFG:
    SIEMENS [Siemens Semiconductor Group]
 

Abstract


The IC TDA 4605-1 controls the MOS-power transistor and performs all necessary regulation and
monitoring functions in free running flyback converters. Since good load regulation over a wide load
range is attained, this IC is applicable tor consumer and industrial power supplies.
The serial circuit of power transistor and primary winding of the flyback transformer is connected to
the input voltage. During the switch - on period of the transistor, energy is stored in the transformer
and during the switch - off period it 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 ot 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.
Type Ordering Code Package
TDA 4605 Q67000-A8078 P-DIP-8-1
Control IC for Switched-Mode Power Supplies
using MOS-Transistors
Bipolar IC
TDA 4605
P-DIP-8-1
Features
a71 Fold-back characteristic provides overload protection for
external components
a71 Burst operation under short-circuit conditions
a71 Loop error protection
a71 Switch-off if line voltage is too low (undervoltage switch-off)
a71 Line voltage compensation of overload point
a71 Soft-start for quiet start-up
a71 Chip-over temperature protection (thermal shutdown)
a71 On-chip parasitic transformer oscillation suppression
circuitry
Semiconductor Group 33 06.94

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