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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 23/23頁 |
| 文件大?。?/td> | 746K |
| 代理商： | TDA4605-3 |
Version 2.0
9
1 Jul 2002
TDA 4605-3
Pin 8
The zero detector controlling the logic block recognizes the transformer being discharged by
positive to negative zero crossing of pin 8 voltage and enables the logic for a new pulse. Parasitic
oscillations occurring at the end of a pulse cannot lead to a new pulse (double pulsing), because an
internal circuit inhibits the zero detector for a finite time
tUL after the end of each pulse.
Start-Up Behaviour
The start-up behaviour of the application circuit per sheet 88 is represented an sheet 90 for a line
voltage barely above the lower acceptable limit time
t0 the following voltages built up:
–
V6 corresponding to the half-wave charge current over R1
–
V2 to V2 max (typically 6.6 V)
–
V3 to the value determined by the divider R 10/R 11 .
The current drawn by the IC in this case is less than 1.6 mA.
If
V6 reaches the threshold V6E (time point t1), the IC switches on the internal reference voltage. The
current draw max. rises to 12 mA. The primary current- voltage reproducer regulates
V2 down to V2B
and the starting impulse generator generates the starting impulses from time point
t5 to t6 . The
feedback to pin 8 starts the next impulse and so on. All impulses including the starting impulse are
controlled in width by regulating voltage of pin 1. When switching on this corresponds to a short-
circuit event, i.e.
V1 = 0. Hence the IC starts up with "short-circuit impulses" to assume a width
depending on the regulating voltage feedback (the IC operates in the overload range). The IC
operates at the overload point. Thereafter the peak values of
V2 decrease rapidly, as the starting
attempt is aborted (pin 5 is switched to low). As the IC remains switched on,
V6 further decreases
to
V6 . The IC switches off; V6 can rise again (time point t4) and a new start-up attempt begins at
time point
t1 . If the rectified alternating Iine voltage (primary voltage) collapses during load, V3 can
fall below
V3A , as is happening at time point t3 (switch-on attempt when voltage is too low). The
primary voltage monitor then clamps
V3 to V3S until the IC switches off (V6 < V6A). Then a new start-
up attempt begins at time point
t1 .
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