tea1521t-n2 NXP Semiconductors, tea1521t-n2 Datasheet - Page 8

• Manufacturer Part Number: tea1521t-n2
• Description: Tea152x Family Smps Ics For Low-power Systems
• Manufacturer: NXP Semiconductors

Philips Semiconductors
TEA152X_FAM_2
Product data sheet
8.10 Overvoltage protection
8.11 Output characteristics of complete power plug
8.12 Input characteristics of complete power plug
8.9 Overtemperature protection
An accurate temperature protection is provided in the device. When the junction
temperature exceeds the thermal shutdown temperature, the IC stops switching. During
thermal protection, the IC current is lowered to the start-up current. The IC continues
normal operation as soon as the overtemperature situation has disappeared.
Overvoltage protection can be achieved in the application by pulling pin REG above its
normal operation level. The current primary stroke is terminated immediately, and no new
primary stroke is started until the voltage on pin REG drops to its normal operation level.
Pin REG has an internal clamp. The current feed into this pin must be limited.
Typical characteristics:
Typical characteristics:
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Output power: A wide range of output power levels can be handled by choosing the
R
Accuracy: The accuracy of the complete converter, functioning as a voltage source
with primary sensing, is approximately 8 % (mainly dependent on the transformer
coupling). The accuracy with secondary sensing is defined by the accuracy of the
external components. For safety requirements in case of optocoupler feedback loss,
the primary sensing remains active when an overvoltage circuit is connected.
Efficiency: An efficiency of 75 % at maximum output power can be achieved for a
complete converter designed for universal mains.
Ripple: A minimum ripple is obtained in a system designed for a maximum duty factor
of 50 % under normal operating conditions, and a minimized dead time. The
magnitude of the ripple in the output voltage is determined by the frequency and duty
factor of the converter, the output current level and the value and ESR of the output
capacitor.
The input voltage range comprises the universal AC mains (80 V to 276 V).
DS(on)
and package of the TEA152x family. Power levels up to 30 W can be realized.
Rev. 02 — 25 January 2006
SMPS ICs for low-power systems
TEA152x family
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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