The TPS92391 is an automotive high-efficiency LED driver with boost controller. The Six high-precision current sinks support phase shifting that is automatically adjusted based on the number of channels in use. LED brightness can be controlled globally through the I²C interface or PWM input.
The boost controller has adaptive output voltage control based on the headroom voltages of the LED current sinks. This feature minimizes the power consumption by adjusting the boost voltage to the lowest sufficient level in all conditions. A wide-range adjustable frequency allows the TPS92391 to avoid disturbance for AM radio band.
The TPS92391 supports built-in hybrid PWM dimming and analog current dimming, which reduces EMI, extends the LED lifetime, and increases the total optical efficiency.
PART NUMBER(1) | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS92391 | QFN (32) | 5 mm × 5 mm |
DATE | REVISION | NOTES |
---|---|---|
March 2021 | * | Initial Release |
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | OUT6 | Analog | LED current sink output. If unused tie to ground.. |
2 | OUT5 | Analog | LED current sink output. If unused tie to ground.. |
3 | OUT4 | Analog | LED current sink output. If unused tie to ground. |
4 | LED_GND | GND | LED ground connection. |
5 | OUT3 | Analog | LED current sink output. If unused tie to ground. |
6 | OUT2 | Analog | LED current sink output. If unused tie to ground. |
7 | OUT1 | Analog | LED current sink output. If unused tie to ground. |
8 | INT | Analog | Device fault interrupt output, open drain. A 10-kΩ pullup resistor is recommended. |
9 | SDA | Analog | SDA for I2C interface. A 10-kΩ pullup resistor is recommended. |
10 | SCL | Analog | SCL for I2C interface. A 10-kΩ pullup resistor is recommended. |
11 | BST_SYNC | Analog | Input for synchronizing boost. When synchronization is not used, connect this pin to ground to disable spread spectrum or to VDD to enable spread spectrum. |
12 | PWM | Analog | PWM input for brightness control. Tie to GND if unused. |
13 | SGND | GND | Signal ground. |
14 | LED_SET | Analog | LED string configuration through external resistor. Do not leave floating. |
15 | PWM_FSET | Analog | LED dimming frequency setup through external resistor. Do not leave floating. |
16 | BST_FSET | Analog | Boost switching frequency setup through external resistor. Do not leave floating. |
17 | MODE | Analog | Dimming mode setup through external resistor. Do not leave floating. |
18 | UVLO | Analog | Input voltage sense for programming input UVLO threshold through external resistor to VIN. |
19 | VSENSE_P | Analog | Pin for input voltage detection for OVP protection and positive input for input current sense. |
20 | VSENSE_N | Analog | Negative input for input current sense. If input current sense is not used, please tie to VSENSE_P pin. |
21 | SD | Analog | Power line FET control. Open Drain output. If unused, leave this pin floating. |
22 | VDD | Power | Power supply input for internal analog and digital circuit. Connect a 10-uF capacitor between the VDD pin to GND. |
23 | EN | Analog | Enable input. |
24 | C1N | Analog | Negative input for charge pump flying capacitor. If feature not used leave this pin floating. |
25 | C1P | Analog | Positive input for charge pump flying capacitor. If feature not used leave this pin floating. |
26 | CPUMP | Power | Charge pump output pin. Connect to VDD if charge pump is not used. A 4.7-µF decoupling capacitor is recommended on CPUMP pin. |
27 | GD | Analog | Gate driver output for external N-FET. |
28 | PGND | GND | Power ground. |
29 | ISNS | Analog | Boost current sense pin. |
30 | ISNSGND | GND | Current sense resistor GND. |
31 | ISET | Analog | LED full-scale current setup through external resistor. |
32 | FB | Analog | Boost feedback input. |
DAP | LED_GND | GND | LED ground connection. |