TEA1522T/N2 IC

Technical Specifications of TEA1522T/N2,118

Datasheet	TEA1522T/N2,118 datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – AC DC Converters, Offline Switchers
Manufacturer	NXP Semiconductors
Series	STARplug?
Packaging	Tape & Reel (TR)
Part Status	Obsolete
Output Isolation	Isolated
Internal Switch(s)	Yes
Voltage – Breakdown	650V
Topology	Flyback
Voltage – Start Up	9.5V
Voltage – Supply (Vcc/Vdd)	7.5 V ~ 40 V
Duty Cycle	75%
Frequency – Switching	10kHz ~ 200kHz
Power (Watts)	30W
Fault Protection	Current Limiting, Over Temperature, Short Circuit
Control Features	Frequency Control
Operating Temperature	-40°C ~ 145°C (TJ)
Package / Case	14-SOIC (0.154″, 3.90mm Width)
Supplier Device Package	14-SO
Mounting Type	Surface Mount

General Description

The TEA152x family STARplug is an SMPS controller IC that operates directly from rectified universal mains. It is realized using a high-voltage EZ-HV SOI technology and a low-voltage Bipolar Complementary Metal-Oxide Semiconductor method. A high-voltage power switch and a circuit for direct start-up from rectified mains voltage are included in the device.

A dedicated circuit for valley switching is included, allowing for an extremely efficient slim-line electronic power-plug approach. The TEA152x series serves as a voltage source in its most basic application. No further secondary electronics are required in this case. A combined voltage and current source can be achieved with minimal external component expenses. Implementing the TEA152x family results in an efficient and low-cost power supply system.

Features and Benefits

• It is powered by a universal alternating current mains supply (80 V to 276 V).
• Adjustable frequency allows for a more flexible design.
• Load-insensitive regulation loop continuous RC oscillator.
• Valley switching is used to reduce switch-on loss.
• Low standby power (100 mW) is possible due to frequency reduction at low power output.
• Overcurrent protection that can be adjusted.
• Undervoltage safeguards.
• Temperature control.
• Protection against short-circuiting of the windings.
• A straightforward application that includes both primary and secondary (opto) feedback.
• DIP8 and SO14 packages are available.

Functional Description

The TEA152x series is the heart of a tiny fly-back converter, with the integrated circuit (IC) located on the primary side. The auxiliary winding of the transformer can be employed for indirect feedback control of the isolated output. This additional winding also drives the integrated circuit. An additional secondary sensor circuit and optocoupler feedback can be employed to achieve more accurate control of the output voltage and current. The TEA152x series use voltage mode control.

The maximal transformer demagnetizing time and the time of the oscillator define the frequency. The converter runs in Self-Oscillating Power Supply mode in the first example. It runs at a constant frequency in the latter instance, which can be modified using the external components RRC and CRC. Pulse Width Modulation (PWM) is the name given to this mode. Furthermore, a primary stroke begins only in a secondary ringing valley. Valley switching reduces capacitive switch-on losses.

● Start-up and Undervoltage lockout

The IC first self-supplies from the rectified mains voltage. The IC begins switching when the voltage on pin VCC exceeds the VCC(startup) level. As soon as VCC is high enough, the transformer’s auxiliary winding takes over the supply, and the supply from the line is cut off for the high-efficiency operation. When the auxiliary supply is insufficient, the high-voltage supply also powers the IC. The IC stops switching and resumes from the rectified mains voltage when the voltage on pin VCC falls below the VCC(stop) level.

● Oscillator

The external resistor and capacitor on pin RC control the oscillator’s frequency. The external capacitor is rapidly charged to the VRC(max) level and then discharged to the VRC(min) level, beginning with a new primary stroke. Due to the discharge’s exponential nature, the duty factor’s relative sensitivity to the regulating voltage at low duty factors is nearly equivalent to the sensitivity at high duty factors.

Compared to PWM systems with a linear sawtooth oscillator, this results in a more constant gain over the duty factor range. It is simple to achieve stable operation at low-duty factors. When the duty factor falls below a specified number, the frequency is lowered for high efficiency. This is performed by increasing the charge time of the oscillator. The value of the oscillator capacitor should be limited to around 1 nF to ensure that the capacitor can be charged within the charging period.

● Duty factor control

The oscillator signal on pin RC and the internal control voltage dictates the duty factor of the circuit. The internal regulation voltage, typically 2.5 V in external voltage regulators, is calculated by multiplying the external regulation voltage by the error amplifier gain. For most applications, the error amplifier gain is approximately 20 dB, equivalent to a factor of ten.

● Demagnetization

The system is always in discontinuous conduction mode. The oscillator will not initiate a fresh primary stroke until the secondary stroke has ended. Demagnetization recognition is disabled for the first tsuppr seconds. This suppression may be required in cases where the transformer has a high leakage inductance and output voltages are low.

● Overcurrent Protection (OCP)

The external source resistor RI is utilized in the cycle-by-cycle peak drain current limit circuit to measure current. The circuit is engaged after the leading-edge blanking time tleb. The protective circuit restricts the source voltage to Vsource(max), limiting the primary peak current.

● Short-circuit winding protection

Following the leading-edge blanking period, the short-circuit winding protection circuit is also triggered. The IC stops switching if the source voltage exceeds the short-circuit winding protection voltage Vswp. Only a power-on reset will return the system to regular operation. A secondary diode short circuit is likewise protected by short-circuit winding protection.

● OverTemperature

Security (OTP) The device includes accurate temperature protection. The IC stops switching when the junction temperature exceeds the thermal shutdown temperature. The IC current is reduced to the start-up current during thermal protection. When the overtemperature condition has passed, the IC resumes regular operation.

● OverVoltage Protection (OVP)

Security (OTP) The device includes accurate temperature protection. The IC stops switching when the junction temperature exceeds the thermal shutdown temperature. The IC current is reduced to the start-up current during thermal protection. When the overtemperature condition has passed, the IC resumes regular operation.

Conclusion

Finally, the TEA152x family STARplug is an amazing power supply solution that is both efficient and inexpensive. Its variable frequency and load-insensitive regulation loop continuous RC oscillator make it adaptable enough to act as a voltage and current source while requiring few external components.

The TEA152x series also includes several safety features, like overcurrent protection, undervoltage safeguards, temperature management, and protection against winding short-circuiting, ensuring its dependability and safety. In addition, valley switching results in lower switch-on loss and lower standby power usage. The TEA152x series is likewise easy to operate, with simple start-up and undervoltage lockout and an oscillator for duty factor control, demagnetization, and overvoltage safety. Its availability in DIP8 and SO14 packages adds design flexibility for various applications.

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