TPS92550
www.ti.com
SNVS806C –MAY 2012–REVISED MAY 2013
ELECTRICAL CHARACTERISTICS
Limits in standard type are for TJ= 25°C unless otherwise stated; limits in boldface type apply over the operating junction
temperature range TJof –40°C to 125°C. Minimum and maximum limits are specified through test, design, or statistical
correlation. Typical values represent the most likely parametric norm at TJ= 25°C, and are provided for reference purposes
only. Unless otherwise stated the following conditions apply: VIN =24 V, ILED = 350mA. VIN is the voltage applied across LED+
and GND. IIN is the input current flowing into the LED+ node. ILED is a LED current flowing into the LED- pin. VLED is the
voltage applied across LED+ and LED-. VDIM is the voltage applied across the DIM pin to ground. Resistor RIADJ connect from
IADJ pin to ground. Resistor RVREF connect from VREF pin to ground.
Symbol Parameter Conditions Min (1) Typ (2) Max (1) Units
SYSTEM PARAMETERS
IIN Input Current VLED = 0V, 4.5V ≤VIN ≤36V, VDIM = 0V 2.0 2.35 2.7 mA
ILED LED Current VLED = 18V, RIADJ = 0Ω, RVREF = open, TJ= 25°C 336 350 361 mA
VLED = 18V, RIADJ = 0Ω, RVREF = open, 328 350 361
TJ= 25°C to 125°C
VLED = 18V, RIADJ = 0Ω, RVREF = open, 328 350 370
TJ= –40°C to 125°C
ILED–36V LED Current at VIN = 36V VIN = 36V, VLED = 24V, RIADJ = 0Ω, RVREF = open, 332 350 359 mA
TJ= 25°C
VIN = 36V, VLED = 24V, RIADJ = 0Ω, RVREF = open, 330 350 359
TJ= 25°C to 125°C
VIN = 36V, VLED = 24V, RIADJ = 0Ω, RVREF = open, 330 350 366
TJ= –40°C to 125°C
ILED-ADJ1 Adjusted LED Current VLED = 18V, RIADJ = 0Ω, RVREF = 10.5kΩ, TJ= 25°C 432 450 466 mA
VLED = 18V, RIADJ = 0Ω, RVREF = 10.5kΩ, 429 450 466
TJ= 25°C to 125°C
VLED = 18, V RIADJ = 0Ω, RVREF = 10.5kΩ,429 450 474
TJ= –40°C to 125°C
ILED-ADJ2 Adjusted LED Current VLED = 18V, RIADJ = 500Ω, RVREF = open, 287 300 309 mA
TJ= 25°C
VLED = 18V, RIADJ = 500Ω, RVREF = open, 283 300 309
TJ= 25°C to 125°C
VLED = 18V, RIADJ = 500Ω, RVREF = open, 283 300 315
TJ= –40°C to 125°C
ILED-SHORT LED Short Circuit Current VLED = 0V, VIN = 36V, DIM = open 800 900 1020 mA
at VIN = 36V
ILED-LEAK “LED-” pin leakage VLED = 0V, VIN = operating max, DIM = 0V 1.2 µA
current
fSW Switching Frequency VLED = 12V, RIADJ = 0Ω, RVREF = open 365 400 450 kHz
VDIM DIM Pin Threshold VDIM Increasing 1.0 1.2 V
VDIM-HYS DIM Pin Hysteresis 0.25 V
THERMAL CHARACTERISTICS
TSD Thermal Shutdown TJRising 170 °C
Temperature
TSD-HYS Thermal Shutdown Temp. TJRising 10 °C
Hysteresis
θJA Junction to Ambient(3) 4 Layer JEDEC Printed Circuit Board, 100 vias, No air flow 19.3 °C/W
2 Layer JEDEC PCB, No air flow 21.5
θJC Junction to Case No air flow 1.9 °C/W
(1) Min and Max limits are 100% production tested at an ambient temperature (TA) of 25°C. Limits over the operating temperature range are
specified through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate Average Outgoing Quality
Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely parametric norm.
(3) θJA measured on a 1.705” x 3.0” four layer board, with one ounce copper , thirty five 12 mil thermal vias, no air flow, and 1W power
dissipation.
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