Texas Instruments TPS92691, User Manual, Page: 5 / 25

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Connector Description
3.6 TP5, IADJ
The IADJ test point connects through a two-pole low-pass filter to the IADJ pin of the TPS92691-Q1
device. The default reference is set to 420 mV through a resistor divider network connected to VCC
resulting in output current of 300 mA. The voltage on IADJ can be externally set using either a pulse width
modulated signal from function generator or a DC power supply between 140 mV to over 2.4 V. For more
details on setting analog adjust voltage refer to
Section 6.5 .
3.7 TP4, IMON
The IMON test point connects directly to the IMON pin of the TPS92691-Q1 device. The IMON voltage,
corresponding to measured LED current by integrated rail-to-rail current sense amplifier, can be monitored
with this test point. The pin can be connected to an external comparator or microcontroller to detect LED
short-circuit, LED+ to VIN, and LED+ to GND fault conditions.
4 Electrical Performance Specifications
Table 1. TPS92691EVM-001 Electrical Performance Specifications
Parameter Test Conditions MIN TYP MAX Unit
Input Characteristics
Input voltage range 7 14 40 V
Input UVLO setting 4.5 V
Maximum switch node voltage 100 V
Output Characteristics
Output voltage, VOUT LED+ to LED– 2 40 65 V
Output current 100 300 1700 mA
Maximum output power 25 W
Analog dimming range V
IADJ
= 140 mV to 2.4 V 17:1
PWM dimming range 240-Hz PWM frequency 100:1
Systems Characteristics
Efficiency Input voltage = 14 V, 13 LEDs, I
LED
= 90%
300 mA
Switching frequency 390 kHz
5 SLVUAL8 – December 2015 TPS92691 SEPIC LED Driver Evaluation Board
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