TEA1620P Datasheet PDF - NXP Semiconductors
| Part Number | TEA1620P | |
| Description | Switched Mode Power Supply (SMPS) controller IC | |
| Manufacturers | NXP Semiconductors | |
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TEA1620P
STARplugTM
Rev. 01 — 17 March 2004
Product data sheet
1. General description
The TEA1620P is a Switched Mode Power Supply (SMPS) controller IC that operates
directly from the rectified universal mains. It is implemented in the high voltage EZ-HV™
SOI process, combined with a low voltage BICMOS process.
The device includes a high voltage power switch and a circuit for start-up directly from the
rectified mains voltage. A dedicated circuit for valley switching is built in, which makes a
very efficient slim-line electronic power-plug concept possible.
In its most basic version of application, the TEA1620P acts as a voltage source. Here, no
additional secondary electronics are required. A combined voltage and current source can
be realized with minimum costs for external components. Implementation of the
TEA1620P renders an efficient and low cost power supply system.
2. Features
s Designed for general purpose supplies
s Integrated power switch: 48 Ω and 650 V
s Operates from universal AC mains supplies: 80 V to 276 V
s Adjustable frequency for flexible design
s RC oscillator for load insensitive regulation loop constant
s Valley switching for minimum switch-on loss
s Frequency reduction at low power output for low standby power: <100 mW
s Adjustable overcurrent protection
s Undervoltage protection
s Temperature protection
s Short winding protection
s Safe restart mode for system fault conditions
s Simple application with both primary and secondary (opto) feedback
s Available in 8-pin DIP package.
3. Applications
s Chargers
s Adapters
s TV and monitor standby supplies
s PC peripherals.
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Philips Semiconductors
TEA1620P
STARplugTM
To ensure that the capacitor can be charged within the charge time, the value of the
oscillator capacitor should be limited to approximately 1 nF.
8.3 Duty factor control
The duty factor is controlled by the internal regulation voltage and the oscillator signal on
pin RC. The internal regulation voltage is equal to the external regulation voltage (minus
2.5 V) multiplied by the gain of the error amplifier (typical 20 dB or 10 ×).
The minimum duty factor of the switched mode power supply is 0 %. The maximum duty
factor is set to 75 % (typical value at 100 kHz oscillation frequency).
8.4 Valley switching
A new cycle is started at the primary stroke when the switch is switched on (see Figure 3).
After a certain time (determined by the RC oscillator voltage and the internal regulation
level), the switch is turned off and the secondary stroke starts. The internal regulation
level is determined by the voltage on pin REG. After the secondary stroke, the drain
voltage shows an oscillation with a frequency of approximately --------------1----------------
2π × LpCp
Where:
Lp is the primary self inductance on the drain node
Cp is the parasitic capacitance on the drain node.
As soon as the oscillator voltage is high again and the secondary stroke has ended, the
circuit waits for a low drain voltage before starting a new primary stroke.
The primary stroke starts some time before the actual valley at low ringing frequencies,
and some time after the actual valley at high ringing frequencies. Figure 4 shows a typical
curve for a reflected voltage N × Vo of 80 V. This voltage is the output voltage Vo (see
Figure 5) transferred to the primary side of the transformer with the factor N (determined
by the turns ratio of the transformer). Figure 4 shows that the system switches exactly at
minimum drain voltage for ringing frequencies of 480 kHz, thus reducing the switch-on
losses to a minimum. At 200 kHz, the next primary stroke is started at 33° before the
valley. The switch-on losses are still reduced significantly.
9397 750 12577
Product data sheet
Rev. 01 — 17 March 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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| Information | Total 16 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ TEA1620P.PDF Datasheet ] | |
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