SLUUCI5A July   2021  – November 2021 TPS92519-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Warnings and Cautions
  4. 3Description
    1. 3.1 Typical Applications
    2. 3.2 Features
    3. 3.3 Connector and Test Point Description
    4. 3.4 Electrical Performance Specifications
  5. 4Test Setup
    1. 4.1 Input Supplies and LED Load Connections
    2. 4.2 Switching Frequency Selection
    3. 4.3 Analog Dimming Using IADJx
    4. 4.4 PWM Dimming Using UDIMx and PWM Test Points
  6. 5Performance Data and Typical Characteristic Curves
    1. 5.1 Efficiency
    2. 5.2 Analog Dimming
    3. 5.3 PWM Dimming
    4. 5.4 PWM Dimming Waveforms
  7. 6Schematic
  8. 7TPS92519EVM-169 PCB Layout
  9. 8Bill of Materials
  10. 9Revision History

3.3 Connector and Test Point Description

This section describes the connectors and test points on the EVM and how to properly connect, setup, and use the TPS92519EVM-169.

Figure 3-1 TPS9519EVM-169 Top View – EVM Functions and Features
Figure 3-2 TPS9519EVM-169 Bottom View – EVM Functions and Features
This section describes the connectors, names, and descriptions.
Figure 3-3 TPS9259EVM-169 Connector Numbers and Locations
Table 3-1 Connectors
Connector Description

J1

This connector is used in conjunction with a shunt to disable channel 1. Note this connector is designed to be used when R5 is loaded to create a resistor divider with V5D. If an external supply is used to provide the voltage to IADJ pin, then the shunt shorts the supply when inserted.

J2

This connector is used in conjunction with a shunt to disable channel 2. Note this connector is designed to be used when R1 is loaded to create a resistor divider with V5D. If an external supply is used to provide the voltage to IADJ pin, then the shunt shorts the supply when inserted.
J3

This connector allows for creating a connector that mates to J3, where pin 1 is LED2+, pin 2 is GND, and pin 3 is VIN2.
J4 This connector allows for creating a connector that mates to J4, where pin 1 is VIN1, pin 2 is GND, and pin 3 is LED1+.

J5

J5 is used in conjunction with a shunt to disable both channels and the device is put into sleep mode.

This section describes the test points, names, and descriptions.

Figure 3-4 TPS9259EVM-169 Test point Numbers and Locations
Table 3-2 Test Points
Test PointDescription
GND (TP11, TP18, TP19, TP20, TP21, TP22, TP24)Larger metal turrets and test points allow for multiple connection to grounds across the board.
VIN1 (TP14)The VIN1 test point allows for voltage and current measurement of the power applied to the VIN1 pin of the TPS92519-Q1. R20 is by default loaded and connects VIN1 to VIN2 and must be removed if is desired to connect VIN1 and VIN2 separately.
VIN2 (TP6)The VIN2 test point allows for voltage and current measurement of the power applied to the VIN2 pin of the TPS92519-Q1. R20 is by default loaded and connects VIN1 to VIN2 and must be removed if is desired to connect VIN1 and VIN2 seperately.

5V (TP7)

The 5-V test point is for external 5-V supply to power both V5D and V5A when R10 is loaded.
VLED1+ (TP23)The VLED1 test point allows for connection of the LED loads to channel-1 output. Large turrets allow for multiple connections.
VLED2+ (TP1)The VLED2 test point allows for connection of the LED loads to channel-2 output. Large turrets allow for multiple connections.

SW1 (TP13)

The SW1 test point allows for observing the switch node for channel 1 during operation with an oscilloscope.

SW2 (TP3)

The SW2 test point allows for observing the switch node for channel 2 during operation with an oscilloscope.

5VD (TP9)

V5D test point connects directly to the V5D digital pin of the TPS92519-Q1. The test point can be used to monitor the voltage or used to supply the power directly to the V5D pin. Note if doing current measurements R10 connects 5VD rail to V5A, which consumes power but can be separated by removing R10 and supplying V5A externally.

V5A (TP8)

V5A test point connects directly to V5A pin of the TPS92519-Q1. This can be used to monitor the voltage or current used to supply the power directly to V5A pin assuming R10 has been removed and is applied externally. By default V5D and V5A are shorted together using R10 and the supply is provided by the 5V supply.

UDIM1 (TP17)

UDIM1 test point allows for the direct connection of the UDIM1 pin of the TPS92519-Q1 for PWM dimming of channel 1. Note that when UDIM1 is below 1.02 V falling the channel is disabled. Read the External PWM Dimming and Input Undervoltage Lockout (UVLO) section in the TPS92519-Q1 4.5-V to 65-V Dual 2-A Synchronous Buck LED Driver Data Sheet for additional information.

UDIM2 (TP2)

UDIM2 test point allows for the direct connection of the UDIM2 pin of the TPS92519-Q1 for PWM dimming of channel 2. Note that when UDIM2 is below 1.02 V falling the channel is disabled. Read the External PWM Dimming and Input Undervoltage Lockout (UVLO) section in the TPS92519-Q1 4.5-V to 65-V Dual 2-A Synchronous Buck LED Driver Data Sheet for additional information.

PWM1 (TP16)

These are the test points used to perform external PWM dimming for channel 1. UDIM1 is inverted from PWM1.

PWM2 (TP15)

These are the test points used to perform external PWM dimming for channel 2. UDIM2 is inverted from PWM2.
FLT1 (TP12)The FLT1 test point can be used to monitor if a fault has occurrence in the TPS92519-Q1 on channel 1. When a fault occurs, FLT1 voltage level goes low. Read Faults and Diagnostics section of the TPS92519-Q1 4.5-V to 65-V Dual 2-A Synchronous Buck LED Driver Data Sheet to determine which faults trigger the FLTx indication.
FLT2 (TP5)The FLT2 test point can be used to monitor if a fault has occurrence in the TPS92519-Q1 on channel 2. When a fault occurs, FLT2 voltage level goes low. Read Faults and Diagnostics section of the TPS92519-Q1 4.5-V to 65-V Dual 2-A Synchronous Buck LED Driver Data Sheet to determine which faults trigger the FLTx indication.

IADJ1 (TP10)

The TPS92519's LED current are controlled by applying a voltage to the IADJ1 test point. J1 can be used to disable the output by shorting the IADJ1 pin to ground. 140 mV to 2.45 V for VIADJ gives 122 mA to 2134 mA of output current. If using an external supply to IADJ1 pin then do not short the supply by loading J1.

IADJ2 (TP4)

The TPS92519's LED current is controlled by applying a voltage to the IADJ2 test point. J2 can be used to disable the output by shorting the IADJ2 pin to ground. 140 mV to 2.45 V for VIADJ gives 122 mA to 2134 mA of output current. If using an external supply to IADJ2 pin then do not short the supply by loading J2.

EN (TP28)

The EN test point is connected to the TPS92519 to either enable or disable the device. By default, the test point is turned on. A jumper can be applied to J5 to disable the part or the EN test point can be pulled low to disable the device.