TPS92611QDGNRQ1

Product Folder Order Now Support & Community Tools & Software Technical Documents TPS92611-Q1 SLDS238B – JANUARY 2018 – REVISED JANUARY 2020 TPS92611-Q1 Automotive Single-Channel Linear LED Driver 1 Features 2 Applications • • • 1 • • • • • • • • • • Qualified for Automotive Applications AEC-Q100 Qualified With the Following Results: – Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range – Device HBM ESD Classification Level H2 – Device CDM ESD Classification Level C3B Functional safety capable – Documentation available to aid functional safety system design Single-Channel Constant-Current LED Driver With PWM Dimming Wide Input-Voltage Range: 4.5 V–40 V Constant Output Current, Adjustable by Sense Resistor Precision Current Regulation, Tolerance ±4.6% Maximum Current: 300 mA Heat Sharing With External Resistor Low Dropout Voltage (Current-Sense Voltage Drop Included) – Maximum Dropout: 150 mV at 10 mA – Maximum Dropout: 400 mV at 70 mA – Maximum Dropout: 700 mV at 150 mA – Maximum Dropout: 1.3 V at 300 mA Diagnostics and Protection – LED Open-Circuit and Short-Circuit Detection With Auto-Recovery – Diagnostic-Enable With Adjustable Threshold for Low-Dropout Operation – Fault Bus up to 15 Devices, Configurable As Either One-Fails–All-Fail or Only-FailedChannel Off – Low Quiescent Current and Fault-Mode Current ( T(TSD) On or off t(TSD_deg) Constantcurrent pulldown Devices turns output off. Externally pulled low Auto recover Device turns output off Table 2. Fault Table With DIAGEN = LOW FAULT BUS STATUS FAULT TYPE DETECTION MECHANISM FAULT floating Open-circuit or or externally short-to-supply pulled up Short-toVOUT < ground V(SG_th_rising) Overtemperature TJ > T(TSD) CHANNEL DEGLITCH STATE TIME FAULT BUS FAULT HANDLING ROUTINE FAULT RECOVERY Ignored On t(SG_deg) Constantcurrent pulldown Device turns output off and Auto recover retries with constant current I(retry), ignoring the PWM input. On or off t(TSD_deg) Constantcurrent pulldown Devices turns output off. Externally pulled low Auto recover Device turns output off 7.4 Device Functional Modes 7.4.1 Undervoltage Lockout, V(SUPPLY) < V(POR_rising) When the device is in undervoltage lockout mode, the TPS92611-Q1 device disables all functions until the supply rises above the POR-rising threshold. 7.4.2 Normal Operation V(SUPPLY) ≥ 4.5 V The device drives an LED string in normal operation. With enough voltage drop across SUPPLY and OUT, the device is able to drive the output in constant-current mode. 7.4.3 Low-Voltage Dropout When the device drives an LED string in low-dropout mode, if the voltage drop is less than the open-circuit detection threshold, the device may report a false open. Set the DIAGEN threshold higher than the LED string voltage to avoid a false open-circuit detection. 7.4.4 Fault Mode When the device detects an open or shorted LED, the device tries to pull down the FAULT pin with a constant current. If the fault bus is pulled down, the device switches to fault mode and consumes a fault current of I(FAULT). Submit Documentation Feedback Copyright © 2018–2020, Texas Instruments Incorporated Product Folder Links: TPS92611-Q1 13 TPS92611-Q1 SLDS238B – JANUARY 2018 – REVISED JANUARY 2020 www.ti.com 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information In automotive lighting applications, thermal performance and LED diagnostics are always design challenges for linear LED drivers. The TPS92611-Q1 device is capable of detecting LED open-circuit and LED short-circuit failures. To further increase current-driving capability, the TPS92611-Q1 device supports heat sharing with an external parallel resistor as shown in Figure 21. This technique provides the low-cost solution of using external resistors to dissipate heat due to high input voltage, and still keeps high accuracy of the total current output. Note that the one-fails–all-fail feature is not supported by this topology. 8.2 Typical Application 8.2.1 Single-Channel LED Driver With Diagnostics The TPS92611-Q1 device can be a good fit for LED driver applications with diagnostics requirements. In many cases, LED diagnostics are mandatory for applications such as automotive exterior lighting. 4.5 ± 40V TPS92611 ± Q1 EN EN SUPPLY R2 C1 DIAGEN R1 PWM FAULT R(SNS) DIAGEN IN PWM OUT FAULT GND C2 Copyright © 2017, Texas Instruments Incorporated Figure 19. Typical Application Diagram 8.2.1.1 Design Requirements Input voltage range is 9 V to 16 V, LED maximum forward voltage Vfmax = 2.5 V, minimum forward voltage Vfmin = 1.9 V, current I(LED) = 50 mA. 8.2.1.2 Detailed Design Procedure Current setting by a sense resistor is as described in Equation 1. V(CS _ REG) R(SNS) 1.96: I(LED) (2) LED-string maximum forward voltage = 3 × 2.5 V = 7.5 V. 14 Submit Documentation Feedback Copyright © 2018–2020, Texas Instruments Incorporated Product Folder Links: TPS92611-Q1 TPS92611-Q1 www.ti.com SLDS238B – JANUARY 2018 – REVISED JANUARY 2020 Typical Application (continued) With 400-mV headroom reserved for the TPS92611-Q1 device between SUPPLY and OUT, the TPS92611-Q1 device must disable open-circuit detection when the supply voltage is below 7.9 V by using the DIAGEN feature. 7.9 u R1 VIL(DIAG,min) R1 R2 (3) Set R1 = 10 kΩ, R2 = 65.6 kΩ. Total device power consumption at worst case is with 16-V input and LEDs at minimal forward voltage. P(Max) = (V(SUPPLY) - V(CS _ REG) - V(OUT) ) ´ I(LED) + V(SUPPLY) ´ I(Quiescent) = (16 - 3 ´ 1.9 - 0.098) ´ 0.05 + 16 ´ 0.00025 = 0.5141 W (4) TI recommends to add capacitors C1 and C2 at SUPPLY and OUT. TI recommends C1 of 1 µF and 100 nF close to the SUPPLY pin, and C2 of 10 nF close to the OUT pin. A larger capacitor for C1 or C2 is helpful for EMC and ESD; however, it takes a longer time to charge up the capacitor and could affect PWM dimming performance. 8.2.1.3 Application Curve Ch. 1 = V(OUT) Ch. 2 = V(PWM) Ch. 4 = I(OUT) Figure 20. Output Current With PWM Input 8.2.2 Single-Channel LED Driver With Heat Sharing Using parallel resistors, thermal performance can be improved by balancing current between the TPS92611-Q1 device and the external resistors as follows. As the current-sense resistor controls the total LED string current, the LED string current I(LED) is set by V(CS_REG) / R(SNS), while the TPS92611-Q1 current I(DRIVE) and parallel resistor current I(P) combine to the total current. Note that the device is not able to control the parallel resistor path, thus TI does not suggest to use one-fails–all-fail with this topology. For PWM applications, TI suggests to add an external bipolar switch at the bottom of LED strings. The PWM input and bipolar switch inputs must be tied together to minimize delay mismatch and to avoid false open-circuit faults. Submit Documentation Feedback Copyright © 2018–2020, Texas Instruments Incorporated Product Folder Links: TPS92611-Q1 15 TPS92611-Q1 SLDS238B – JANUARY 2018 – REVISED JANUARY 2020 www.ti.com Typical Application (continued) 4.5 ± 40V TPS92611 ± Q1 EN SUPPLY R2 DIAGEN C1 R1 I(DRIVE) R(SNS) DIAGEN IN R(P) PWM I(LED) PWM OUT FAULT GND I(P) C2 FAULT PWM PWM Copyright © 2017, Texas Instruments Incorporated Figure 21. Heat Sharing With a Parallel Resistor 8.2.2.1 Design Requirements Input voltage range is 9 V to 16 V, LED maximum forward voltage Vfmax = 2.5 V, minimum forward voltage Vfmin = 1.9 V, current I(LED) = 200 mA. 8.2.2.2 Detailed Design Procedure In linear LED driver applications, the input voltage variation contributes to most of the thermal concerns. The resistor current, as indicated by Ohm’s law, depends on the voltage across the external resistors. The TPS92611-Q1 controls the driver current I(DRIVE) to attain the desired total current. If I(P) increases, the TPS92611-Q1 device decreases I(DRIVE) to compensate, and vice versa. While in low-dropout mode, the voltage across the R(P) resistor may be close to zero, so that almost no current can flow through the external resistor R(P). When the input voltage is high, the parallel-resistor current I(P) is proportional to the voltage across the parallel resistor R(P). The parallel resistor R(P) takes the majority of the total string current, generating maximum heat. The device must prevent current from draining out to ensure current regulation capability. In this case, the parallel resistor value must be carefully calculated to ensure that 1) enough output current is achieved in low-dropout mode, 2) thermal dissipation for both the TPS92611-Q1 device and the resistor is within their thermal dissipation limits, and 3) device current in the high-voltage mode is above the minimal outputcurrent requirement. TI recommends to add capacitors C1 and C2 at SUPPLY and OUT. TI recommends C1 of 1 µF and 100 nF close to the SUPPLY pin, and C2 of 10 nF close to the OUT pin. A larger capacitor for C1 or C2 is helpful for EMC and ESD; however, it takes a longer time to charge up the capacitor and could affect PWM dimming performance. Current setting by a sense resistor is as described in Equation 1. V(CS _ REG) R(SNS) 0.49: I(LED) (5) LED-string maximum forward voltage = 3 × 2.5 V = 7.5 V. Parallel resistor R(P) is recommended to consume 1/2 of the total current at maximum supply voltage. 16 Submit Documentation Feedback Copyright © 2018–2020, Texas Instruments Incorporated Product Folder Links: TPS92611-Q1 TPS92611-Q1 www.ti.com SLDS238B – JANUARY 2018 – REVISED JANUARY 2020 Typical Application (continued) R(P) V(SUPPLY) V(CS _ REG) V(OUT) 0.5 u I(LED) 16 3 u 1.9 0.098 | 100: 0.5 u 0.2 (6) Total device power consumption is maximum at 16 V input and LED minimal forward voltage. æ V(SUPPLY ) - V(CS _ REG) - V(OUT ) P(DEV _ MAX) = (V(SUPPLY ) - V(CS _ REG) - V(OUT ) ) ´ ç I(LED) ç R (P) è = (16 - 3 ´ 1.9 - 0.098) ´ 0.1 + 16 ´ 0.00025 = 1.0242 W ö ÷ + V(SUPPLY ) ´ I(Quiescent) ÷ ø (7) Resistor R(P) maximum power consumption is at 16-V input. P(RP _ MAX) = = (V(SUPPLY) - V(CS _ REG) - V(OUT) )2 R(P) + V(SUPPLY) ´ I(Quiescent) (16 - 3 ´ 1.9 - 0.098)2 = 1.04 W 100 (8) Users must consider the maximum power of both of the device and the parallel resistor. For PWM scenarios, a non-power bipolar transistor with a base current-limiting resistor of 10 kΩ can modulate the output current together with the device PWM function. 8.2.2.3 Application Curve Ch. 1 = V(SUPPLY) Ch. 2 = V(OUT) Ch. 4 = I(LED) Supply voltage increases from 9 V to 16 V Ch. 3 = I(P) Figure 22. Constant Output Current With Increasing Supply Voltage 9 Power Supply Recommendations The TPS92611-Q1 device is qualified for automotive applications. The normal power supply connection is therefore to an automobile electrical system that provides a voltage within the range specified in the Recommended Operating Conditions. Submit Documentation Feedback Copyright © 2018–2020, Texas Instruments Incorporated Product Folder Links: TPS92611-Q1 17 TPS92611-Q1 SLDS238B – JANUARY 2018 – REVISED JANUARY 2020 www.ti.com 10 Layout 10.1 Layout Guidelines Thermal dissipation is the primary consideration for TPS92611-Q1 layout. TI recommends good thermal dissipation area connected to thermal pads with thermal vias. 10.2 Layout Example SUPPLY IN TPS92611-Q1 1 EN 2 SUPPLY 8 DIAGEN IN 7 3 PWM OUT 6 4 FAULT GND 5 GND Copyright © 2017, Texas Instruments Incorporated Figure 23. TPS92611-Q1 Example Layout Diagram 18 Submit Documentation Feedback Copyright © 2018–2020, Texas Instruments Incorporated Product Folder Links: TPS92611-Q1 TPS92611-Q1 www.ti.com SLDS238B – JANUARY 2018 – REVISED JANUARY 2020 11 Device and Documentation Support 11.1 Documentation Support 11.1.1 Related Documentation For related documentation see the following: • TPS92610-Q1 Automotive Single-Channel Linear LED Driver • TPS92612-Q1 Automotive Single-Channel Linear LED Driver • TPS92610-Q1 EVM User's Guide • How to Calculate TPS92630-Q1 Maximum Output Current for Automotive Exterior Lighting Applications • Automotive Linear LED Driver Reference Design for Center High-Mounted Stop Lamp (CHMSL) • Automotive Linear LED Driver Reference Design for Center High-Mounted Stop Lamp (CHMSL) 11.2 Receiving Notification of Documentation Updates To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document. 11.3 Community Resources TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight from the experts. Search existing answers or ask your own question to get the quick design help you need. Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. 11.4 Trademarks PowerPAD, E2E are trademarks of Texas Instruments. All other trademarks are the property of their respective owners. 11.5 Electrostatic Discharge Caution This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 11.6 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 12 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the mostcurrent data available for the designated device. This data is subject to change without notice and without revision of this document. For browser-based versions of this data sheet, see the left-hand navigation pane. Submit Documentation Feedback Copyright © 2018–2020, Texas Instruments Incorporated Product Folder Links: TPS92611-Q1 19 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) TPS92611QDGNRQ1 ACTIVE HVSSOP DGN 8 2500 RoHS & Green NIPDAUAG Level-2-260C-1 YEAR -40 to 125 1N3X (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of