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TEA1530AT Arkusz danych(PDF) 6 Page - NXP Semiconductors

Numer części TEA1530AT
Szczegółowy opis  GreenChip II SMPS control IC
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TEA1530AT Arkusz danych(HTML) 6 Page - NXP Semiconductors

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TEA1530T_AT_AP_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 30 June 2008
6 of 21
NXP Semiconductors
TEA1530T/AT/AP
GreenChip II SMPS control IC
7.1 Start-up, mains enabling operation level and undervoltage lockout
Refer to Figure 8 and Figure 9. Initially, the IC is self supplying from the rectified mains
voltage via pin DRAIN. The supply capacitor CVCC (at pin 1) is charged by the internal
start-up current source to a level of about 4 V or higher, depending on the drain voltage.
Once the drain voltage exceeds the Vmains(oper)(en) (mains-dependent operation-enabling
level), the start-up current source will continue charging capacitor CVCC (switch S1 will be
opened), see Figure 1. The IC activates the power converter as soon as the voltage on
pin VCC passes the Vstartup level. At this moment the IC supply from the high voltage pin is
stopped (green function). The IC supply is taken over by the auxiliary winding of the
flyback converter.
The moment the voltage on pin VCC drops below Vth(UVLO) (undervoltage lockout), the IC
stops switching and performs a safe restart from the rectified mains voltage. In the safe
restart mode the driver output is disabled and the voltage on pin VCC is recharged via the
pin DRAIN.
7.2 Supply management
All (internal) reference voltages are derived from a temperature compensated, on-chip
band gap circuit.
7.3 Current control mode
Current control mode is used for its good line regulation behavior.
The primary current is sensed across an external resistor and compared with the internal
control voltage. The driver output is latched in the logic, preventing multiple switch-on.
The internal control voltage is inversely proportional to the voltage on the external
pin CTRL with an offset of 1.5 V. This means that a voltage range from 1 V to
approximately 1.5 V on pin CTRL will result in a pin SENSE voltage range from
0.52 V to 25 mV (a high external control voltage results in a low duty cycle).
7.4 Oscillator
The fixed frequency of the oscillator is set by an internal current source and capacitor.
Fig 5.
The Vsense(max) voltage as a function of VCTRL
VCTRL (V)
1 V
(typ)
0.52 V
1.5 V
(typ)
coa016
Vsense(max) (V)
cycle
skip
active
25 mV


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