TPS92642-Q1数据手册TI中文资料规格书

描述 Description

The TPS92642-Q1 is a monolithic, synchronous Buck LED driver with a wide 5.5-V to 36-V operating input voltage range and 40-V tolerance that supports load dump for duration of 400 ms. The TPS92642-Q1 implements an adaptive on-time average current mode control based on inductor valley current detection. The adaptive on-time control provides near constant switching frequency that can be set between 100 kHz and 2.2 MHz. Inductor current sensing and closed-loop feedback enables better than ±4% accuracy over wide input, output and ambient temperature.

The high-performance infrared LED driver can independently modulate LED current using both analog or PWM dimming techniques. Linear analog dimming range with over 15:1 range is obtained by setting the IADJ voltage. PWM dimming of LED current is achieved by directly modulating the UDIM input pin with desired duty cycle. The device incorporates an internal pulse monitoring circuit that limits the maximum pulse duty cycle.

The TPS92642-Q1 incorporates advanced diagnostic and fault protection featuring: cycle-by-cycle switch current limit, bootstrap undervoltage, LED open, LED short and thermal shutdown.

The TPS92642-Q1 is available in a 6.6-mm × 5.1-mm thermally-enhanced 16-pin HTSSOP package with 0.65-mm lead pitch.

特性 Features

• AEC-Q100 qualified for automotive applications
• Grade 1: –40°C to 125°C ambient operating temperature
• Device HBM classification level H1C
• Device CDM classification level C5

• Functional Safety-Capable
• Documentation available to aid functional safety system design

• Input voltage range: 5.5 V to 36 V
• Operation down to 5.15 V after start-up

• Up to 5-A pulsed output current with 4% accuracy
• Adaptive on-time current control
• Low offset high-side current sense amplifier
• Stable with any combination of ceramic, and aluminum capacitors

• Programmable switching frequency from 100 kHz to 2.2 MHz
• Advanced dimming operation
• 1000:1 precision PWM dimming
• 15:1 precision analog dimming

• Internal maximum duty cycle limit
• Cycle-by-cycle switch overcurrent protection
• Open-drain fault indicator output
• LED short circuit, open circuit and cable harness fault indication

• Thermal shutdown protection