TPS54200DDCR IC

TPS54200DDCR  Description

The TPS54200 and TPS54201 are 1.5-Asynchronous buck mono-color or IR drivers that can take up to 28 V as input. Current-mode operation allows for a quicker response to transients and an easier loop stabilization. The TPS54200 and TPS54201 can power monochrome or IR LED arrays in night vision cameras. Because both chips can power multi-string LED arrays, this is the situation.

Despite their compact size, the TPS54200 and TPS54201 devices have a high-power density (PCB). The usage of MOSFETs and the SOT-23-THIN packaging makes this a reality. The TPS54200 and TPS54201 devices execute analog dimming by altering the internal reference voltage in a manner proportional to the duty cycle of the PW signal input. The gadget also works in the pulse width modulation (PWM) dimming mode. When operating in this mode, the internal reference voltage is set to 100 mV, significantly improving efficiency.

TPS54200DDCR  Features

• Broad Input Range, 4.5 to 28 V.
• Integrated 1.5 A, Continuous Output Current MOSFETs with 150 m and 70 m channels.
• Low Shutdown Current of 2 A.
• Fixed frequency of 600 kHz.
• Internal Compensation Mode for Peak Current.
• LED-Short and Open Protection
• Short and open sense resistor protection.
• Protection in Shutdown-and-Latch Mode (TPS54200).
• Automatic Retry Mode Defense (TPS54201).
• Thermostatic shutdown
• SOT-23-THIN 6-pin package.

TPS54200DDCR Detailed Description

A synchronous buck LED driver, the TPS5420x can handle 1.5 A of current and a maximum input voltage of 28 V. The operation in current mode provides a quick transient response. The effective internal compensation network reduces the quantity of external parts, simplifying the design of the control loop. The switching frequency of the TPS5420x device is fixed at 600 kHz. This strikes a good balance between the size of the device and its effectiveness.

An integrated high-side MOSFET with a resistance of 150 m and a low-side MOSFET with a resistance of 70 m enable a high-efficiency LED driver with a continuous output current of up to 1.5 A. The TPS5420x gadget supports both analog and PWM dimming modes for deep dimming. The analog dimming mode adjusts the internal reference voltage in response to the PWM signal’s duty cycle between 1% and 100%. This takes place within the range. The LED flashes on and off at regular intervals in accordance with the PWM duty cycle while the PWM dimming mode is on.

The internal reference’s value was decreased by half to 100 mV to increase efficiency. The high-side MOSFET’s cycle-by-cycle current limiting shields the converter against overload situations. An upper bound on the free-wheeling current in a low-side MOSFET ,  which stops current runaway, strengthens this protection. These two characteristics help to protect the converter when used together. Low-side MOSFETs are designed with a sinking-current limit to prevent excessive reverse current. The TPS5420x has features like LED open and short protection, sensing resistor open and short protection, and device thermal protection to guarantee the user’s security. The TPS54201 device uses auto-retry mode to implement protection instead of the TPS54200 device, which uses shutdown-and-latch mode.

TPS54200DDCR Feature Description

● Fixed-Frequency PWM Control

To regulate the device’s peak current, a constant frequency is used. When a resistor is connected in series with a string of LEDs, it may measure the current flowing through the LEDs. After passing via an RC filter, the measured voltage is sent to the FB pin, where an error amplifier compares it to a fixed value. The high-side power switch is activated by an internal oscillator.

The current flowing through the high-side power switch is compared to the output of the error amplifier. Once the power switch’s current exceeds the error amplifier’s output voltage level, the high-side switch is disabled, and the low-side is activated. Error amplifier output voltage controls inductor peak current, which controls LED current. The device has a maximum clamp that limits the voltage of the error amplifier and a minimum clamp that enhances its transient response.

● Error Amplifier

The transconductance amplifier in the gadget serves as the error amplifier. To determine if the FB voltage is low or high, the error amplifier compares it to either the internal soft-start voltage or the internal voltage reference. For a common error amplifier, 240 A/V is the transconductance. The error amplifier’s output is connected to the ground, and the frequency correction components are inside the circuit.

● Slope Compensation and Output Current

This device amplifies the switch current signal by a compensatory ramp. As the duty cycle increases, this slope adjustment dampens any potential for subharmonic oscillations. For the entire duty-cycle range, the peak inductor current available is unvarying.

● Bootstrap Voltage (BOOT)

While the TPS5420x has an internal regulator, the gate drive voltage for the high-side MOSFET must be supplied by a 0.1-F ceramic capacitor connected between the BOOT and SW pins. Because of their consistent performance across various temperatures and voltages, ceramic capacitors of X7R or X5R dielectric grade are highly recommended. There is independent UVLO shielding in this boot regulator. This UVLO has a 100-mV hysteresis and a 2.1 V rising threshold. If VVIN exceeds 6 volts, the bootstrap voltage between BOOT and SW will remain at 6 volts.

TPS54200DDCR Device Functional Modes

● Enable and Disable Device

Dimming and turning on/off are handled by the same PWM pin. To turn on the TPS5420x, the VIN voltage must be higher than the UVLO threshold, typically 0.56 V, and the PWM pin must be driven higher than the threshold. Keeping the PWM pin at or below the device’s threshold voltage, typically 0.55 V, for 40 ms or longer will turn it off. With an integrated pulldown resistor, floating the PWM pin effectively turns off the circuit. Applying VVIN first, then the PWM signal, is recommended for turning the power on and off.

● Mode Detection

The device’s dimming mode is controlled by the PWM signal’s intensity. Next to the PWM pin, an internal peak detector stores the PWM signal’s magnitude. The output of the peak detector is compared to one of two voltage thresholds, VADIM or 1 V, and VPDIM or 2.07 V, after a 300 ms delay from when the device is turned on. If the peak detector’s output voltage exceeds 2.07 V, it is switched to analog dimming mode. If the output voltage is between 1 V and 2.07 V, PWM dimming mode is chosen and locked in. If the output is less than 1 V, the device pauses between comparisons by 300 ms and keeps doing so until a mode is selected and locked.

Conclusion

In conclusion, the TPS54200 and TPS54201 are remarkable LED driver application solutions. These tiny synchronous buck LED drivers provide a broad input voltage range, a high-power density, and MOSFET integration. These devices are useful for night vision cameras since they can power single-string and multi-string arrays of monochrome or infrared LEDs. In addition, the analog and PWM dimming modes and numerous safety and protection measures ensure that your gadgets run safely and effectively.

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