TPS92512 Datasheet, PDF (1/30 Pages) Texas Instruments – 2.5A Buck LED Driver with Integrated Analog Current Adjust

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TPS92512, TPS92512HV
SLVSCT1B – FEBRUARY 2015 – REVISED APRIL 2015
TPS92512 2.5A Buck LED Driver with Integrated Analog Current Adjust
1 Features
•1 Integrated 200-mΩ High-Side MOSFET
• 4.5-V to 42-V Input Voltage Range
(4.5 V to 60 V for the TPS92512HV)
• 0 V to 300 mV Adjustable Voltage Reference
• ±5% LED Current Accuracy
• 100-kHz to 2-MHz Switching Frequency Range
• Dedicated PWM Dimming Input
• Adjustable Undervoltage-Lock-Out
• Overcurrent Protection
• Overtemperature Protection
• MSOP-10 Package with PowerPAD™
2 Applications
• Street Lighting
• Emergency/Exit Lighting
• General Industrial and Commercial Illumination
• Retail Lighting
• Appliance Lighting
• Transportation Lighting
• Channel Letters
• Light Bars
3 Description
The TPS92512/HV are 2.5A step-down (buck) current
regulators with an integrated MOSFET to drive high
current LEDs. Available with 42 V and 60 V (HV)
input ranges, these LED drivers operate at a user
selected fixed-frequency with peak-current mode
control and deliver excellent line and load regulation.
The TPS92512/HV LED drivers feature separate
inputs for analog and pulse width modulation (PWM)
dimming for no compromise brightness control
achieving contrast ratios of greater than 10:1 and
greater than 100:1, respectively. The PWM input is
compatible with low-voltage logic standards for easy
interface to a broad range of microcontrollers. The
analog LED current setpoint is adjustable from 0 V to
300 mV using the IADJ input with an external 0 V to
1.8 V signal.
For multi-string applications using two or more
TPS92512/HV LED drivers, the internal oscillator can
be overdriven by an external clock ensuring all of the
converters operate at a common frequency thereby
reducing the potential for beat frequencies and
simplifying system EMI filtering. An adjustable input
under-voltage lockout (UVLO) with hysteresis
provides flexibility in setting start/stop voltages based
upon supply voltage conditions.
The TPS92512 includes cycle-by-cycle overcurrent
protection and thermal shutdown protection. It is
available in a 10-pin HVSSOP PowerPAD™ package.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS92512
TPS92512HV
HVSSOP (10)
5.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematics
0.18V ± 1.8V
6
1
IADJ
BOOT
2 VIN
PH 10
4 PDIM
TPS92512
3 UVLO
8 COMP
5 RT/CLK
Pad
ISENSE 7
GND
9
1
Efficiency vs Input Voltage
7 White LEDs at 1.5A (V_OUT = 23 V)
100
97.5
95
92.5
90
87.5
85
25
30
35
40
45
50
55
60
Input Voltage (V)
D001
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.