TPS92692
High Accuracy LED ControllerThe TPS92692 is a high accuracy led controller from Texas Instruments. View the full TPS92692 datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
High Accuracy LED Controller
Package
HTSSOP (20)
Overview
Part: TPS92692, TPS92692-Q1 — Texas Instruments
Type: High Accuracy LED Controller
Description: A high accuracy peak current mode based controller designed to support step-up/down LED driver topologies, featuring wide input voltage from 4.5 V to 65 V, better than ±4% LED current accuracy, and spread spectrum frequency modulation for improved EMI.
Operating Conditions:
- Supply input voltage (VIN): 6.5–65 V (or 4.5 V for battery crank)
- Operating ambient temperature: -40 to 125 °C
- Switching frequency: 80–800 kHz
Absolute Maximum Ratings:
- Max input voltage (VIN, CSP, CSN): 65 V
- Max junction temperature: 150 °C
- Max storage temperature: 165 °C
Key Specs:
- Input stand-by current (IIN(STBY)): 1.8 mA (typ)
- VCC regulation voltage (VCC(REG)): 7.0 V (min), 7.5 V (typ), 8.0 V (max)
- VREF reference voltage: 4.77 V (min), 4.96 V (typ), 5.15 V (max)
- Switching frequency (fSW) at RT = 20 kΩ: 341 kHz (min), 390 kHz (typ), 439 kHz (max)
- Gate driver high side resistance (RGH): 5.4 Ω (typ)
- Current limit threshold (VIS(LIMIT)): 230.6 mV (min), 250 mV (typ), 270 mV (max)
- Maximum duty cycle (DMAX): 90% (typ)
- Current sense amplifier gain (GCS): 14 (typ)
Features:
- Better than ±4% LED Current Accuracy over -40°C to 150°C Junction Temperature Range
- Spread Spectrum Frequency Modulation for Improved EMI
- Comprehensive Fault Protection Circuitry with Current Monitor output and Open Drain Fault Flag Indicator
- Internal Analog Voltage to PWM Duty Cycle Generator for stand-alone Dimming Operation
- Compatible with Direct PWM Input with over 1000:1 Dimming Range
- Analog LED Current Adjust Input (IADJ) with over 15:1 Contrast Ratio
- Integrated P-Channel Driver to enable Series FET Dimming and LED Protection
- TPS92692-Q1: Automotive Q100 Grade 1 Qualified
Applications:
- Automotive Exterior Lighting Applications
- Driver Monitoring Systems (DMS)
- LED General Lighting Applications
- Exit Signs and Emergency Lighting
Package:
- HTSSOP (20) (5.10 mm × 6.60 mm)
Features
- 1 · Wide Input Voltage: 4.5 V to 65 V
- Better than ± 4% LED Current Accuracy over -40°C to 150°C Junction Temperature Range
- Spread Spectrum Frequency Modulation for Improved EMI
- Comprehensive Fault Protection Circuitry with Current Monitor output and Open Drain Fault Flag Indicator
- Internal Analog Voltage to PWM Duty Cycle Generator for stand-alone Dimming Operation
- Compatible with Direct PWM Input with over 1000:1 Dimming Range
- Analog LED Current Adjust Input (IADJ) with over 15:1 Contrast Ratio
- Integrated P-Channel Driver to enable Series FET Dimming and LED Protection
- TPS92692-Q1: Automotive Q100 Grade 1 Qualified
Applications
- TPS92692-Q1: Automotive Exterior Lighting Applications
- Driver Monitoring Systems (DMS)
- LED General Lighting Applications
- Exit Signs and Emergency Lighting
Pin Configuration
Pin Functions
Pin Functions
| PIN | PIN | I/O | DESCRIPTION |
|---|---|---|---|
| NAME | NO. | I/O | DESCRIPTION |
| COMP | 7 | I/O | Transconductance error amplifier output. Connect compensation network to achieve desired closed- loop response. |
| CSN | 13 | I | Current sense amplifier negative input (-). Connect directly to the negative node of LED current sense resistor, R CS . |
| CSP | 14 | I | Current sense amplifier positive input (+). Connect directly to the positive node of LED current sense resistor, R CS . |
| DIM/PWM | 10 | I | External analog to PWM dimming command or direct PWM dimming input. The external analog dimming command between 1 V and 3 V is compared to the internal PWM generator triangle waveform to set LED current duty cycle between 0% and 100%. With PWM generator disabled, a direct PWM dimming command can be applied to control the LED current duty cycle and frequency. The analog or PWM command is used to generate an internal PWM signal that controls the GATE and PDRV outputs. Setting the internal PWM signal to logic level low, turns off switching, idles the oscillator, disconnects the COMP pin, and sets PDRV to V CSP . Connect to VREF when not used for PWM dimming. |
| DM | 5 | I/O | Triangle wave spread spectrum modulation frequency, f m , programming pin. Connect a capacitor to GND to set the spread spectrum modulating frequency. Connect directly to GND to disable spread spectrum modulation of switching frequency. |
| FLT | 3 | O | Open-drain fault indicator. Connect to VREF with a resistor to create active low fault signal output. Internal LED short circuit protection and auto-restart timer can enabled by directly connecting the pin to SS input. |
| GATE | 19 | O | N-channel MOSFET gate driver output. Connect to gate of external main switching N-channel MOSFET. |
| GND | 17 | - | Analog and Power ground connection pin. Connect to circuit ground to complete return path. |
| IADJ | 9 | I | LED current reference input. Connect this pin to VCC with a 100-k Ω series resistor to set the internal reference voltage to 2.42 V and the current sense threshold, V (CSP-CSN) to 170.7 mV. The pin can be modulated by an external voltage source from 140 mV to 2.25 V to implement analog dimming. |
| IMON | 8 | O | LED current report pin. The LED current sensed by CSP/CSN input is reported as V IMON = 14 × I LED × R CS . Bypass with a 1-nF ceramic capacitor connected to GND. |
| IS | 18 | I | Switch current sense input. Connect to the switch sense resistor, R IS to set the switch current limit threshold based on the internal 250 mV reference. |
| OV | 15 | I | Output voltage input. Connect a resistor divider from output voltage to GND to set output overvoltage and under-voltage protection thresholds. |
| PDRV | 12 | O | Series dimming P-channel FET gate driver output. Connect to gate of external P-channel MOSFET to implement series FET PWM dimming and fault disconnect. |
Electrical Characteristics
-40°C ≤ TJ ≤ 150°C, VIN = 14 V, VIADJ = 2.1 V, VRAMP = 500 mV, VDIM/PWM = 3 V, VOV = 500 mV, CVCC = 1 μF, CVREF = 1 μF, CCOMP = 2.2 nF, RCS = 100 m Ω , RT = 20 k Ω , no load on GATE and PDRV (unless otherwise noted) (1)
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| INPUT VOLTAGE (VIN) | INPUT VOLTAGE (VIN) | |||||
| I IN(STBY) | Input stand-by current | V PWM = 0 V | 1.8 | 2.5 | mA | |
| I IN(SW) | Input switching current | V CC = 7.5 V, C GATE = 1 nF | 5.1 | 6.6 | mA | |
| BIAS SUPPLY (VCC) | BIAS SUPPLY (VCC) | |||||
| V CC(REG) | Regulation voltage | No load | 7.0 | 7.5 | 8.0 | V |
| VCC rising threshold, V IN = 8 V | 4.5 | 4.9 | V | |||
| V CC(UVLO) | Supply undervoltage protection | VCC falling threshold, V IN = 8 V Hysteresis | 3.7 | 4.1 400 | V mV | |
| I CC(LIMIT) | Supply current limit | V CC = 0 V | 30 | 36 | 46 | mA |
| V DO | LDO dropout voltage | I CC = 20 mA, V IN = 5 V | 300 | mV | ||
| REFERENCE VOLTAGE (VREF) | REFERENCE VOLTAGE (VREF) | |||||
| VREF | Reference voltage | No load | 4.77 | 4.96 | 5.15 | V |
| I REF(LIMIT) | Current limit | V REF = 0 V | 30 | 36 | 46 | mA |
| OSCILLATOR (RT) | OSCILLATOR (RT) | |||||
| R T = 40 k Ω | 175 | 200 | 225 | kHz | ||
| ƒ SW | Switching frequency | R T = 20 k Ω | 341 | 390 | 439 | kHz |
| V RT | RT output voltage | 1 | V | |||
| SYNC rising threshold | V RT rising | 2.5 | 3.1 | V | ||
| V SYNC | SYNC falling threshold | V RT falling | 1.8 | 2 | V | |
| t SYNC(MIN) | Minimum SYNC clock pulse width | 100 | ns | |||
| SPREAD SPECTRUM FREQUENCY MODULATION (DM) | SPREAD SPECTRUM FREQUENCY MODULATION (DM) Triangle wave generator sink current | SPREAD SPECTRUM FREQUENCY MODULATION (DM) | SPREAD SPECTRUM FREQUENCY MODULATION (DM) | SPREAD SPECTRUM FREQUENCY MODULATION (DM) 10 | SPREAD SPECTRUM FREQUENCY MODULATION (DM) | SPREAD SPECTRUM FREQUENCY MODULATION (DM) μA |
| I DM | Triangle wave generator source current Triangle wave voltage peak (High) | 10 1.15 | μA V | |||
| V DM(TR) | Triangle wave voltage valley (Low) | 850 | mV | |||
| V DM(EN) | Spread spectrum modulation enable threshold | 700 | mV | |||
| V DM(CLAMP) | Internal clamp voltage | V PWM = 0 V, R RAMP = 200 k Ω | 1.25 | V | ||
| GATE DRIVER (GATE) | GATE DRIVER (GATE) | |||||
| R GH | Gate driver high side resistance | I GATE = -10 mA | 5.4 | 11.2 | Ω | |
| R GL | Gate driver low side resistance | I GATE = 10 mA | 4.3 | 10.5 | Ω | |
| CURRENT SENSE (IS) | CURRENT SENSE (IS) | |||||
| V | Current limit threshold | V DIM/PWM = 5 V, R RAMP = 249 k Ω | 230.6 | 250 | 270 | mV |
| IS(LIMIT) | V DIM/PWM = 0 V, R RAMP = 249 k Ω | 665 | 700 | 735 | mV | |
| t IS(BLANK) | Leading edge blanking time | 88 | 118 | 158 | ns | |
| t IS(FAULT) | Current limit fault time | 35 | μs | |||
| t ILMT(DLY) | IS to GATE propagation delay | V IS pulsed from 0 V to 1 V | 78 | ns |
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)(2)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Input voltage | VIN, CSP, CSN | -0.3 | 65 | V |
| Input voltage | DIM/PWM | -0.3 | 14 | V |
| Input voltage | IS, RT, FLT | -0.3 | 8.8 | V |
| Input voltage | OV, SS, RAMP, DM, SLOPE, VREF, IADJ | -0.3 | 5.5 | V |
| Input voltage | CSP to CSN (3) | -0.3 | 0.3 | V |
| Output | VCC, GATE | -0.3 | 8.8 | V |
| Output | PDRV | V CSP - 8.8 | V CSP | V |
| Output | COMP | -0.3 | 5.0 | V |
| Source | IMON | - | 100 | μA |
| Source | GATE (pulsed < 20 ns) | - | 500 | mA |
| Source | PDRV (pulsed < 10 μs) | - | 50 | mA |
| GATE (pulsed < 20 ns) | - | 500 | mA | |
| PDRV (pulsed < 10 μs) | - | 50 | mA | |
| Operating junction temperature, T J | Operating junction temperature, T J | -40 | 150 | °C |
| Storage temperature, T stg | Storage temperature, T stg | 165 | °C |
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | NOM | MAX | UNIT | ||
|---|---|---|---|---|---|
| VIN | Supply input voltage | 6.5 | 14 | 65 | V |
| VIN, crank | Supply input, battery crank voltage | 4.5 | V | ||
| V CSP , V CSN | Current sense common mode | 6.5 | 60 | V | |
| ƒ SW | Switching frequency | 80 | 800 | kHz | |
| ƒ m | Spread spectrum modulation frequency | 0.1 | 12 | kHz | |
| f RAMP | Internal PWM ramp generator frequency | 100 | 2000 | Hz | |
| V IADJ | Current reference voltage | 0.14 | V IADJ(CLAMP) | V | |
| T A | Operating ambient temperature | -40 | 125 | °C |
Thermal Information
| THERMAL METRIC | (1) | TPS92692 PWP (HTSSOP) 20 PINS | TPS92692-Q1 PWP (HTSSOP) 20 PINS | UNIT |
|---|---|---|---|---|
| R θ JA | Junction-to-ambient thermal resistance | 40.8 | 40.8 | °C/W |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 26.1 | 26.1 | °C/W |
| R θ JB | Junction-to-board thermal resistance | 22.2 | 22.2 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 0.8 | 0.8 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 22 | 22 | °C/W |
| R θ JC(bot) | Junction-to-case (bottom) thermal resistance | 2.3 | 2.3 | °C/W |
Typical Application
The TPS92692 and TPS92692-Q1 controllers are suitable for implementing step-up or step-down LED driver topologies including boost, buck-boost, SEPIC, and flyback. Use the following design procedure to select component values for the TPS92692-Q1 device. This section presents a simplified discussion of the design process for the boost and buck-boost converter. The expressions derived for the buck-boost topology can be altered to select components for a 1:1 coupled-inductor SEPIC converter. The design procedure can be easily adapted for flyback and similar converter topologies.
Figure 36. Boost LED Driver
Figure 37. Buck-Boost LED Driver
Figure 38. SEPIC LED Driver
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| TPS92692-Q1 | Texas Instruments | HTSSOP (20) |
| TPS92692PWPR | Texas Instruments | — |
| TPS92692PWPT | Texas Instruments | — |
| TPS92692QPWPRQ1 | Texas Instruments | HTSSOP (20) |
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