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MOS TRANSISTORS. TDA4605 Datasheet

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MOS TRANSISTORS. TDA4605 Datasheet






TDA4605 TRANSISTORS. Datasheet pdf. Equivalent






TDA4605 TRANSISTORS. Datasheet pdf. Equivalent


TDA4605

Part

TDA4605

Description

CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS



Feature


TDA4605 CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS . . . . . . . . . FOLD-BACK CHARACTERIS TIC PROVIDES OVERLOAD PROTECTION FOR EX TERNAL DIODES BURST OPERATION UNDER SHO RT-CIRCUIT AND NO LOAD CONDITIONS LOOP ERROR PROTECTION SWITCH-OFF IN CASE OF TOO LOW LINE VOLTAGE (under voltage swi tch-off) LINE VOLTAGE COMPENSATION OF O VERLOAD POINT SOFT.
Manufacture

ST Microelectronics

Datasheet
Download TDA4605 Datasheet


ST Microelectronics TDA4605

TDA4605; -START FOR SMOOTH START-UP CHIP OVER-TEM PERATURE PROTECTION (thermal shutdown) ON-CHIP PARASITIC TRANSFORMER OSCILLATI ON SUPPRESSION CIRCUITRY DECREASE OF RE GULATED VOLTAGE FOR LOW POWER CONSUMPTI ON DIP8 (Plastic Package) ORDER CODE : TDA4605 DESCRIPTION The IC TDA4605 co ntrols the MOS Power Transistor and per forms all necessary regulation and moni toring functions i.


ST Microelectronics TDA4605

n free running flyback converters. Since good load regulation over a wide load range is attained, this IC is particula rly suitable for Consumer as well as In dustrial Power Supplies. Alternative so urce of the TDA4605 is also available f rom SIEMENS Semiconductors Consumer Ele ctronics A.G. PIN CONNECTIONS SO8 (Pla stic Micropackage) ORDER CODE : TDA4605 D REGULATION INPU.

Part

TDA4605

Description

CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS



Feature


TDA4605 CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS . . . . . . . . . FOLD-BACK CHARACTERIS TIC PROVIDES OVERLOAD PROTECTION FOR EX TERNAL DIODES BURST OPERATION UNDER SHO RT-CIRCUIT AND NO LOAD CONDITIONS LOOP ERROR PROTECTION SWITCH-OFF IN CASE OF TOO LOW LINE VOLTAGE (under voltage swi tch-off) LINE VOLTAGE COMPENSATION OF O VERLOAD POINT SOFT.
Manufacture

ST Microelectronics

Datasheet
Download TDA4605 Datasheet




 TDA4605
TDA4605
CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES
USING MOS TRANSISTORS
. FOLD-BACK CHARACTERISTIC PROVIDES
OVERLOAD PROTECTION FOR EXTERNAL
DIODES
. BURST OPERATION UNDER SHORT-CIR-
CUIT AND NO LOAD CONDITIONS
. LOOP ERROR PROTECTION
. SWITCH-OFF IN CASE OF TOO LOW LINE
VOLTAGE (under voltage switch-off)
. LINE VOLTAGE COMPENSATION OF OVER-
LOAD POINT
. SOFT-START FOR SMOOTH START-UP
. CHIP OVER-TEMPERATURE PROTECTION
(thermal shutdown)
. ON-CHIP PARASITIC TRANSFORMER OS-
CILLATION SUPPRESSION CIRCUITRY
. DECREASE OF REGULATED VOLTAGE FOR
LOW POWER CONSUMPTION
DIP8
(Plastic Package)
ORDER CODE : TDA4605
DESCRIPTION
The IC TDA4605 controls the MOS Power Transis-
tor and performs all necessary regulation and
monitoring functions in free running flyback con-
verters. Since good load regulation over a wide
load range is attained, this IC is particularly suitable
for Consumer as well as Industrial Power Supplies.
Alternative source of the TDA4605 is also avail-
able from SIEMENS Semiconductors Consumer
Electronics A.G.
PIN CONNECTIONS
SO8
(Plastic Micropackage)
ORDER CODE : TDA4605D
REGULATION INPUT
PRIMARY CURRENT SIMULATION
PRIMARY VOLTAGE MONITORING
GROU ND
1
2
3
4
8 ZERO CROSSING DETECTOR INPUT
7 SOFT-START
6 SUPPLY VOLTAGE
5 OUTPUT
April 1996
1/6




 TDA4605
TDA4605
PIN CONFIGURATION
Pin
Number
1
2
3
4
5
6
7
8
Description
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)
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.
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.
Ground
Output : push-pull output for charge and discharge of the gate capacitance of the power MOS transistor.
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.
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.
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
BLOCK DIAGRAM
TDA4605
Re fere nce
Volta ge
(typ. 3V)
6
S upply
Volta g e
Monitor
2
V2B
P rima ry
C urre n t
Recopy
5
Output S ta ge
a nd
Current Limit
VR E F
S ta rting
4
V6min V6A V6E V6ma x
Vs t
Imp ulse
Genera tor
Cu rre n t
S ource
R e g ula ting
VR & Ove rload
1 Amplifier
S top
Comp.
Ove rloa d
Low Volta ge
P o int
Vu P rote ction
Corre ction
Monitoring
37
Logic
Ze ro
Cros s ing
De te ctor
8
2/6



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