TPSM82810SILR Power Modules

TPSM82810SILR Description

A family of synchronous step-down DC/DC power modules with integrated inductors, the TPSM8281x is pin-to-pin compatible, high efficiency, and simple to use for 3-A and 4-A applications. They are founded on a peak current-mode control system with a set frequency. They are used in communications, tests and measurements, and medical applications that require great power density and ease of use. Low resistance switches permit continuous output currents of up to 4 A, even in hot environments.

From 1.8 MHz to 4 MHz, the switching frequency can be changed externally. It can also be synchronized to an outside clock with the same frequency range. The TPSM8281x enters Power Save Mode automatically in PFM/PWM mode at light loads to maintain excellent efficiency over the whole load range. A power supply with high output voltage accuracy can be designed with the help of the TPSM8281x, which offers 1% output voltage accuracy in PWM mode. The SS/TR pin tracks the startup time or output voltage to an external source by the SS/TR pin. This enables external sequencing of several supply rails and restricts startup inrush current.

TPSM82810SILR Features

• 75 to 6 volts is the input voltage range.
• Range of the output voltage: 0.6 to 5.5 V.
• 8 MHz to 4 MHz of adjustable and synchronizable switching frequency.
• Optional spread spectrum clocking.
• Forced PWM or PFM/PWM operation options.
• The precision of the output voltage is 1% (PWM operation).
• Output with good power and window comparator.
• The duty cycle of 100%.
• Output release
• A typical quiescent current of 15 Amps.
• Adjustable tracking or soft-start.

Detailed Description

The fixed-frequency peak current-mode control topology is the foundation for the synchronous switch mode DC/DC converter power modules, model number TPSM8281x. Internal compensation is made in the control loop. One of three internal compensation settings can be chosen to tailor the control loop’s bandwidth to the diverse range of output capacitance that can be used with the TPSM8281x.

The devices support fixed-frequency forced PWM operation by connecting the MODE/SYNC pin to a logic high level. When the device’s MODE/SYNC pin is set to a logic low level, it operates in power-saving mode (PFM) at low output currents and switches automatically to fixed-frequency PWM mode at higher output currents. PFM mode’s switching frequency decreases linearly based on the load for high efficiency down to extremely low output currents. By applying an external clock signal to the MODE/SYNC pin, the device can be synchronized to a frequency between 1.8 MHz and 4 MHz.

Feature Description

● Precise Enable (EN)

Upon exceeding the increasing EN threshold, the TPSM8281x activates. The EN pin must be ended and not left floating to function properly. The gadget must shut down to be pulled low on the EN pin. The internal high-side and low-side MOSFETs are off in this mode, and the internal control circuitry is a whole. The TPSM8281x compares the voltage input to the EN pin to a predefined threshold of 1.1 V for a rising voltage.

Typically, the enabled input threshold for a falling edge is 100 mV lower than the threshold for a rising edge. By connecting a resistor divider to the EN pin’s input, the Precise Enable input offers an Undervoltage lockout that the user can program. The Precise Enable input also permits using an external RC network and a slowly varying voltage to drive the pin and produce a precise power-up delay.

● Output Discharge

The discharge function’s main goal is to maintain an output voltage near 0 V while the device is off and provide a defined down-ramp when the device is disabled. The output discharge feature is only functional when the TPSM8281x has been enabled at least once after the supply voltage was supplied. Whenever the device is in thermal shutdown, under-voltage lockout, or disabled, the discharge function is activated. The discharge function normally requires a minimum supply voltage of 1 V to stay operational.

● MODE/SYNC

According to the output current, the device operates in PWM or PFM mode when MODE/SYNC is set low. When set high, the MODE/SYNC pin mandates PWM mode. For external synchronization, the pin additionally enables the application of an external clock with a frequency range of 1.8 MHz to 4 MHz. The system runs in PWM mode when an external clock is applied. When using the external clock signal, the minimum ontime parameter must be followed, like when choosing the switching frequency.

When employing external synchronization, it is advised to match the internal switching frequency set by RCF to the externally applied clock. As a result, the switching frequency will stay within the same range even if the external clock fails, and the settling time to the internal clock will be shortened. External synchronization is not feasible when the pin is pulled high or low, but no resistor connects COMP/FSET to GND. During operation, you can switch from using an internal clock to an external clock thanks to an internal PLL. The rising edge of the internal SW pin is synchronized to the external clock on the falling edge of the applied clock. During use, the MODE/SYNC pin can be modified.

● Spread Spectrum Clocking (SSC) – TPSM8281xS

When using the internal clock, these devices provide a spread spectrum clock, which causes the switching frequency to fluctuate erratically in PWM mode. The usual range of the frequency variation is 288 kHz above the standard switching frequency up to the nominal switching frequency. The TPSM8281xS turns off the internal spread spectrum block and adheres to the external clock when the device is externally synchronized. During a soft start, SSC is also disabled.

● Under voltage Lockout (UVLO)

By turning off both MOSFETs, the Undervoltage lockout stops the device from malfunctioning if the input voltage falls. The device is completely operational when the input voltage rises above the rising UVLO threshold. If the input voltage falls below the falling threshold, the device shuts off.

● Thermal Shutdown

A temperature sensor inside the device keeps track of the junction temperature (TJ). The device enters thermal shutdown if TJ rises beyond 170°C (typ). PG goes low, and the high-side and low-side power FETs are both disabled. The converter restarts regular operation, starting with a gentle start when TJ drops below the hysteresis amount, which is normally 15°C. The thermal shutdown is not engaged during PFM.

● Device Functional Modes

How Pulse Width Modulation (PWM) Works The PFM/PWM mode and the Forced PWM mode are the two operating modes for the TPSM8281x. The TPSM8281x uses pulse width modulation in continuous conduction mode when the MODE/SYNC pin is high (CCM). The switching frequency is determined by the COMP/FSET pin to the GND resistor or an external clock signal connected to the MODE/SYNC pin.

Conclusion

Power saving mode is permitted when the MODE/SYNC pin is low. The device is in PWM mode as long as the peak inductor current is greater than the PFM threshold of around 1.2 A. The gadget begins to skip switching pulses when the peak inductor current falls below the PFM threshold.

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