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EA1530T

GreenChip II SMPS control IC

NXP Semiconductors. 

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).

Vsense(max) (V)

coa016

0.52 V

cycle

skip

active

25 mV

1V

(typ)

1.5 V

(typ) VCTRL (V)

Fig 5. The Vsense(max) voltage as a function of VCTRL

7.4 Oscillator

The fixed frequency of the oscillator is set by an internal current source and capacitor.

TEA1530T_AT_AP_1

Product data sheet

Rev. 01 — 30 June 2008

© NXP B.V. 2008. All rights reserved.

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