TI's TPS92830-Q1 is a three-way high-current linear LED controller that integrates two stages of charge pumps for low-dropout operation. Meets AEC-Q100 specifications, operating temperature range of –40°C to 125°C, input voltage from 4.5V To 40V, 20:1 analog dimming, PWM dimming through PWM input and power supply, mainly used in car front lighting such as position lights, daytime operating lights, front turn signals, low beam lights and automotive rear lighting such as taillights and stop lights , rear turn signal, fog light and reversing light. This article introduces the main features of TPS92830-Q1, block diagram and typical application circuit, as well as the main characteristics of the evaluation board TPS92830-Q1 EVM, circuit diagram and LED board circuit diagram, as well as bill of materials and PCB design .
With the trend of better lighTIng homogeneity, highcurrentLEDs are often used in automoTIve front andrear lamps with lighTIng diffusers and light-guides.Meanwhile, in order to meet strict EMC and reliabilityrequirements, linear LED drivers are popular inautomotive applications. However, it is a challenge The TPS92830-Q1device is an advanced automotive-grade high-sideconstant-current linear LED controller for delivering high current using external N-channel MOSFETs. Thedevice has a full set of features for automotive applications and Is compatible with a wide selection of N-channel MOSFETs.
Each channel of the TPS92830-Q1 device sets the channel current independent by the sense-resistorvalue. An internal precision constant-currentregulation loop senses the channel current by the voltage across the sense resistor and controls the gate voltage of the N-channel MOSFET accordingly.
The device also integrates a two-stage charge pump for low-dropout operation. The charge-pump voltage is high enough to support a wide selection of NchanneliMOSFETs. iPWMidimmingiallowsimultiplesources for flexibility—internal PWM generator, external PWM inputs, or power supply dimming. Variousdiagnostics and protection Features specially designed for automotive applications help improve systemrobustness and ease of use. A one-fails–all-fail fault bus supports TPS92830-Q1 operation together with the TPS92630-Q1, TPS92638-Q1, and TPS9261x-Q1 family to fulfill various fault- Handling requirements.
Main features of TPS92830-Q1:
1• AEC-Q100 Qualified
– Device Temperature Grade 1:–40°C to 125°C Ambient Operating Temperature Range
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C4B
• Wide Voltage Input Range From 4.5 V to 40 V
• 3-Channel High-Side Current Driving and Sensing
– Channel-Independent Current Setting
– Channel-Independent PWM Inputs
– PWM Dimming via Both PWM Inputs and Power Supply
– Optimized Slew Rate for EMC
• High-Precision LED Driving
– Precision Current Regulation With External NChannelMOSFET (2.5% Tolerance)
– 20:1 Analog Dimming Profile With Off-BoardBin Resistor Support
– Precision PWM Generator With Full Duty-Cycle Mask (2% Tolerance)
– Open-Drain PWM Output for Synchronization
• Protection and Diagnostics
– Adjustable Output Current Derating forExternal MOSFET Thermal Protection
– Diagnostics for LED-String Open Circuit orShort Circuit With Auto Recovery
– Diagnostic-Enable With Adjustable Thresholdfor Low-Voltage Operation
– Fault Bus up to 15 Devices, Configurable AsEither One-Fails–All-Fail or Only-Failed-Channel-Off
– Low Quiescent Current in Fault Mode (<0.75mA per Device)
• Operating Junction Temperature Range: –40°C to 150°C
• TSSOP 28 Package (PW)
TPS92830-Q1 application:
• Rear Light – Tail and Stop Light, Rear TurnIndicator, Fog Light, Reverse Light
• Front Light – Position Light, Daytime RunningLight, Front Turn Indicator, Low Beam
Figure 1. Functional block diagram of the TPS92830-Q1
Figure 2. TPS92830-Q1 automotive exterior lighting application circuit diagram
Figure 3. Master-slave configuration of the TPS92830-Q1 PWM generator
Evaluation Board TPS92830-Q1 EVM
The TPS92830-Q1 evaluation module (EVM) helps designers evaluate the operation and performance of the TPS92830-Q1 device, a linear LED controller with external N-channel MOSFETs for automotive lighting applications.
Evaluation Board TPS92830-Q1 EVM main features:
• Channel-Current Setting by Separate High-Side Sensing Resistors
• LED-Short and -Open Protection and Fault Reporting
• Auto-Recovery After Cleaning Fault State
• One-Fails–All-Fail With Fault Floating or Only-Failed-Channel-Off LED Failure Mode With Fault PulledUp
• Stand-Alone Operation With Full Duty Cycle or PWM Dimming via TPS92830-Q1 Internal PWMGenerator (Useful for Stop or Tail Light and Daytime Running Light (DRL) or Position LightApplications)
• PWM Duty Cycle and Frequency Configurable via Jumper
• PWM Output Optional for Sync Dimming (PWMOUT Must Be Pulled Up to 5 V Through a Resistor)
• Analog Dimming With Potentiometer on LED Board (Can Be Used for Bin Resistor)
• Optional LED Board Thermal Protection via ICTRL
• Current Derating During Overvoltage
• Open-Fault Detection Mask During Dropout Mode
• Compatible With Different Type N-Channel MOSFETs
Evaluation Board TPS92830-Q1 EVM Application:
Automotive DRL, position light, stop or tail light, turn indicator, reverse light, fog light, and so forth
Figure 4. Evaluation board TPS92830-Q1 EVM outline drawing
Figure 5. Outline of the LED board
Figure 6. Evaluation board TPS92830-Q1 EVM circuit diagram
Figure 7. LED board circuit diagram Evaluation board TPS92830-Q1 EVM bill of materials:
LED board material list:
Figure 8. Evaluation Board TPS92830-Q1 EVM PCB Layout
Figure 9. LED board PCB layout
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