The TPS61169DCKR is a Power management IC manufactured by Texas Instruments. This component is a part of the TPS61169 series, designed primarily for DC-DC step-up converters to drive LED s, and is typically used in applications such as backlighting for displays, automotive lighting, and industrial lighting.
Package Type:
The TPS61169DCKR is housed in a VQFN-20 package, which consists of 20 pins.Pin Function and Circuit Principles
The 20 pins of the TPS61169DCKR serve various purposes, such as input/output connections, ground connections, control signals, and feedback signals. Below is a detailed description of each pin:
Pin Number Pin Name Pin Function 1 VDD Power supply input pin. Connect to a 3V to 6V power source. 2 GND Ground pin. Connect to the system ground. 3 FBL Feedback loop pin. Used to monitor output voltage and feedback to control loop. 4 EN Enable pin. A logic high enables the device, while a logic low disables it. 5 POK Power OK indicator pin. Logic high indicates that the output voltage is within the desired range. 6 VOUT Output voltage pin. This pin provides the regulated voltage to the load (e.g., LEDs). 7 SW Switch pin. This is connected to the external switch (MOSFET) for the step-up converter. 8 GND Ground pin. Connect to the system ground. 9 FB2 Secondary feedback loop pin. Used for additional regulation in certain configurations. 10 PDRV Power driver pin. Used for controlling the external MOSFET. 11 BOOT Bootstrap pin. Required for the operation of the internal high-side MOSFET. 12 OUT2 Secondary output pin, for multiple-output configurations. 13 IN2 Secondary input pin, for multiple-output configurations. 14 VDD2 Secondary power supply pin, for powering additional stages. 15 PGND Power ground pin. Used for connecting the power section of the circuit. 16 ISEN Current sense pin. Used for current sensing in the inductor. 17 CTRL Control pin. Used to set operating modes, such as burst mode or continuous conduction mode. 18 IN Input power supply pin. Connect to the primary power source. 19 COMP Compensation pin. Used to adjust the compensation network for the control loop. 20 SS Soft-start pin. Used to control the start-up rate of the power supply to reduce inrush current.Circuit Principle
The TPS61169DCKR is designed to operate as a DC-DC step-up converter, typically used to regulate the voltage required to drive LEDs. The core of the converter is based on an inductor-based switching topology, where an inductor is used to store energy and transfer it to the output stage.
Key components in the circuit include:
Inductor (SW pin): The inductor helps store and release energy during the switching process. External MOSFET (PDRV pin): Controls the switching of the inductor. Feedback loop (FBL pin): Regulates the output voltage by comparing the output to the reference voltage.In summary, the converter boosts the input voltage to the desired level, ensuring the output voltage remains stable even with varying input conditions.
Pin Function Detailed List for All 20 Pins:
VDD: Power supply input (3V to 6V). GND: Ground. FBL: Feedback loop input for voltage regulation. EN: Enable pin for turning the IC on/off. POK: Power OK indicator output. VOUT: Output voltage pin. SW: Switch pin connected to the external MOSFET for switching. GND: Ground. FB2: Secondary feedback input for further regulation control. PDRV: Power driver pin for external MOSFET control. BOOT: Bootstrap pin for high-side MOSFET operation. OUT2: Secondary output for multi-output configurations. IN2: Secondary input for multi-output configurations. VDD2: Secondary power supply pin. PGND: Power ground. ISEN: Current sense input for monitoring the inductor current. CTRL: Control pin for setting operation modes. IN: Main input power supply pin. COMP: Compensation pin for loop compensation. SS: Soft-start pin to control power-up behavior.Frequently Asked Questions (FAQ)
Q: What is the power supply voltage range for the TPS61169DCKR? A: The TPS61169DCKR operates with an input voltage range from 3V to 6V.
Q: How do I enable the TPS61169DCKR? A: To enable the device, apply a logic high (typically 3V or higher) to the EN pin.
Q: What is the function of the POK pin? A: The POK pin is a Power OK indicator that signals when the output voltage is within the desired range.
Q: What does the FBL pin do? A: The FBL pin is used for voltage feedback to regulate the output voltage of the step-up converter.
Q: Can I use the TPS61169DCKR for multi-output applications? A: Yes, the TPS61169DCKR supports multiple output configurations using pins like OUT2 and IN2.
Q: How do I control the switching of the external MOSFET? A: The PDRV pin controls the external MOSFET for switching operations.
Q: What is the purpose of the BOOT pin? A: The BOOT pin is used to provide the necessary voltage for the internal high-side MOSFET in the converter.
Q: How do I adjust the operating mode of the TPS61169DCKR? A: The CTRL pin allows you to adjust the operating mode, such as burst mode or continuous conduction mode.
Q: What is the function of the ISEN pin? A: The ISEN pin is used for current sensing in the inductor to monitor current flow.
Q: What is the voltage range for the VDD2 pin? A: VDD2 is a secondary power supply pin and is typically used for powering additional stages. The voltage range should match the input requirements of the secondary stage.
Q: How do I use the COMP pin? A: The COMP pin is used to adjust the compensation network for the feedback loop to stabilize the system.
Q: What is the significance of the SS pin? A: The SS pin controls the soft-start feature, allowing for a controlled voltage ramp-up at power-on to prevent inrush current.
Q: How do I handle the ground pins? A: There are multiple ground pins (GND, PGND), which should all be connected to the system ground to ensure proper functioning.
Q: What is the recommended inductor for use with the TPS61169DCKR? A: A recommended inductor should have a suitable value (e.g., 10µH to 22µH) for proper switching operation.
Q: How can I use the secondary feedback pin (FB2)? A: FB2 is used for applications requiring additional regulation or output voltage control.
Q: What happens if I apply a logic low to the EN pin? A: A logic low on the EN pin disables the TPS61169DCKR, cutting off output voltage.
Q: Can I drive high-power LEDs with this device? A: Yes, the TPS61169DCKR is capable of driving high-power LEDs with proper external circuitry.
Q: Is there a thermal protection feature on the TPS61169DCKR? A: Yes, the TPS61169DCKR includes thermal shutdown protection to prevent overheating.
Q: What is the maximum output current the TPS61169DCKR can provide? A: The maximum output current depends on the specific application and external components used but is typically up to 1A.
Q: How do I calculate the output voltage of the TPS61169DCKR? A: The output voltage is set by the feedback network, using external resistors to form a voltage divider that controls the feedback loop.
This detailed explanation covers the TPS61169DCKR pin functions, specifications, and FAQs as requested. The content is designed to provide a comprehensive understanding of this component.
