ZXLD1101ET5TA - Datasheet, Price & PDF

ZXLD1101ET5TA

The ZXLD1101ET5TA is a low-dropout (LDO) regulator that’s great for driving LEDs. It delivers up to 350mA of constant current, making it ideal for medium-power LEDs.

With an input voltage range of 3V to 40V, it can work with various voltage sources like 12V or 24V systems. It also has a low dropout voltage of just 0.1V at 350mA, which helps conserve battery life in portable devices.

You can control LED brightness easily with its PWM dimming feature. Plus, it includes thermal shutdown and overcurrent protection to keep your setup safe.

The ZXLD1101ET5TA comes in a compact SOT-23-5 package, perfect for tight spaces and surface-mount designs, while offering high efficiency to minimize power loss.

ZXLD1101ET5TA Pinout and Package

Let’s walk through the pins of the ZXLD1101ET5TA:

• Pin 1 (Vin): This is where you connect the input voltage, ranging from 3V to 40V. Just make sure not to exceed the max voltage to avoid damage.

• Pin 2 (GND): This connects to the system ground. Without it, the circuit won’t work.

• Pin 3 (Vout): The output pin delivers the regulated current to the LED.

• Pin 4 (CTRL): This is used for controlling LED brightness via PWM dimming. If you want to adjust the brightness, apply a PWM signal here.

• Pin 5 (ADJ): For adjusting the output current. Connect it to a resistor or reference voltage to set the desired LED current.

Make sure to ground Pin 2 properly. Also, remember that higher power usage may need proper heat dissipation.

ZXLD1101ET5TA Equivalent LED Driver IC

If you’re looking for alternatives to the ZXLD1101ET5TA, here are two options:

• LM3405A: It offers a higher output current of 1A compared to the ZXLD1101ET5TA’s 350mA. This one’s great for applications like backlighting and signage, and it also supports PWM dimming. The only catch is it has a slightly higher dropout voltage at 0.2V.

• MIC23099YC5-TR: This IC provides 600mA of output current and also supports PWM dimming and thermal protection. However, it has a narrower input voltage range (4.5V to 20V) and a higher dropout voltage of 0.25V.

When picking a replacement, make sure it fits your current and voltage needs. The LM3405A and MIC23099YC5-TR are better for higher-current applications, but keep in mind the dropout voltage and thermal requirements.

ZXLD1101ET5TA LED Driver Circuit Design

The ZXLD1101ET5TA is primarily used to drive LEDs with a stable current, ensuring consistent brightness. It works by boosting the input voltage, often from a low source like 3V, to a higher voltage needed for LEDs. This makes it great for low-voltage systems like battery-powered devices.

It also adjusts the current through feedback from the LED, making sure the LED doesn’t overload. You can control whether it’s on or off via the enable (EN) pin.

The IC comes with built-in protections like overvoltage, overcurrent, and thermal shutdown to keep everything safe. In the circuit, it boosts the voltage, regulates the current using a resistor, and filters the power with capacitors for a smooth, stable output.

ZXLD1101ET5TA Boost Converter for LED

The ZXLD1101ET5TA is a great solution for driving LEDs. It steps up a low input voltage (like 3V) to the higher voltage needed for LEDs. It does this using an inductor (L1) to store energy and a diode (D1) to convert it into the higher output voltage.

It also regulates the current going through the LED, which is key for consistent brightness. The feedback pin (FB) monitors the LED’s current to keep things stable.

This IC is efficient, reducing power loss and extending battery life in portable setups. You can control the LED’s current by adding an external resistor (R1), adjusting the LED’s brightness.

Plus, it has built-in protections for overvoltage, overcurrent, and overheating, ensuring safety. The soft-start feature also helps prevent sudden spikes in current, prolonging the LED’s life.

ZXLD1101ET5TA Current Sense Resistor Example

The ZXLD1101ET5TA is a boost converter used to drive LEDs, and it needs a current sense resistor to regulate the current through the LED, ensuring it’s at the right level.

You typically choose a 0.2Ω to 1Ω resistor, depending on the current you want for your LED. The FB pin on the IC monitors the voltage across this resistor, which tells the IC how much current is flowing.

For example, with a 0.5Ω resistor and a target of 350mA, the voltage across the resistor will be 0.175V (0.35A × 0.5Ω).

Make sure the resistor can handle the power it dissipates. For a 0.5Ω resistor at 350mA, the power loss is around 0.06125W, so choose a resistor rated for at least 0.1W.

Place the resistor in series with the LED to monitor the current.

ZXLD1101ET5TA LED Dimming Application

You can dim the LED with the ZXLD1101ET5TA using two methods:

1. PWM Dimming: This method involves rapidly turning the LED on and off. The brightness is controlled by changing the duty cycle of the PWM signal—higher duty cycle = brighter LED, lower duty cycle = dimmer. You apply the PWM signal to the DIM pin and adjust the frequency between 1kHz to 100kHz, depending on your needs.

2. Analog Dimming: Here, you adjust the voltage at the DIM pin. A lower voltage dims the LED, and a higher voltage brightens it. You can use a potentiometer or DAC to set the voltage between 0V (off) and 2.5V (full brightness).

PWM dimming offers more precision, while analog dimming is simpler but might be less efficient at low brightness.