Datasheet
TPS92551, TPS92551EVM
www.ti.com
SNVS805C –MAY 2012–REVISED MAY 2013
ELECTRICAL CHARACTERISTICS
Limits in standard type are for T
J
= 25°C unless otherwise stated; limits in boldface type apply over the operating junction
temperature range T
J
of -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 T
J
= 25°C, and are provided for reference purposes
only. Unless otherwise stated the following conditions apply: V
IN
=48 V, I
LED
= 350mA. V
IN
is the voltage applied across LED+
and GND. I
IN
is the input current flowing into the LED+ node. I
LED
is a LED current flowing into the LED- pin. V
LED
is the
voltage applied across LED+ and LED-. V
DIM
is the voltage applied across the DIM pin to ground. Resistor R
IADJ
connect from
IADJ pin to ground. Resistor R
VREF
connect from VREF pin to ground.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
SYSTEM PARAMETERS
I
IN
Input Current V
LED
= 0V, 4.5V ≤ V
IN
≤ 60V, V
DIM
= 0V 2.1 2.65 3.0 mA
I
LED
LED Current V
LED
= 24V , R
IADJ
= 0Ω, R
VREF
= open, T
J
= 25°C 340 350 364 mA
V
LED
= 24V, R
IADJ
= 0Ω, R
VREF
= open, T
J
= 25°C to 125°C 337 350 364
V
LED
= 24V, R
IADJ
= 0Ω , R
VREF
= open, 337 350 371
T
J
= -40°C to 125°C
I
LED–60V
LED Current V
IN
= 60V, V
LED
= 36V, R
IADJ
= 0Ω R
VREF
= open, 342 350 367 mA
at V
IN
= 60V T
J
= 25°C
V
IN
= 60V, V
LED
= 36V, R
IADJ
= 0Ω, R
VREF
= open, 338 350 367
T
J
= 25°C to 125°C
V
IN
= 60V, V
LED
= 36V, R
IADJ
= 0Ω, R
VREF
= open, 338 350 374
T
J
= -40°C to 125°C
I
LED-ADJ1
Adjusted LED Current V
LED
= 24V, R
IADJ
= 0Ω, R
VREF
= 10.5kΩ, T
J
= 25°C 442 450 471 mA
V
LED
= 24V, R
IADJ
= 0Ω, R
VREF
= 10.5kΩ, 437 450 471
T
J
= 25°C to 125°C
V
LED
= 24V, R
IADJ
= 0Ω, R
VREF
= 10.5kΩ, 437 450 483
T
J
= -40°C to 125°C
I
LED-ADJ2
Adjusted LED Current V
LED
= 24V, R
IADJ
= 500Ω, R
VREF
= open, T
J
= 25°C 288 300 309 mA
V
LED
= 24V, R
IADJ
= 500Ω, R
VREF
= open, 282 300 309
T
J
= 25°C to 125°C
V
LED
= 24V, R
IADJ
= 500Ω, R
VREF
= open, 282 300 316
T
J
= -40°C to 125°C
I
LED-SHORT
LED Short Circuit V
LED
= 0V, V
IN
= 60V, DIM = open 800 920 1020 mA
Current at V
IN
= 60V
I
LED-LEAK
“LED-” pin leakage V
LED
= 0V, V
IN
= operating max, DIM = 0V 1.2 µA
current
f
SW
Switching Frequency V
LED
= 24V, R
IADJ
= 0Ω, R
VREF
= open 720 800 920 kHz
V
DIM
DIM Pin Threshold V
DIM
Increasing 1.0 1.3 V
V
DIM-HYS
DIM Pin Hysteresis 0.25 V
THERMAL CHARACTERISTICS
Thermal Shutdown T
J
Rising 170 °C
T
SD
Temperature
Thermal Shutdown T
J
Rising 10 °C
T
SD-HYS
Temp. Hysteresis
Junction to Ambient
(3)
4 Layer JEDEC Printed Circuit Board, 100 vias, No air flow 19.3 °C/W
θ
JA
2 Layer JEDEC PCB, No air flow 21.5
θ
JC
Junction to Case No air flow 1.9 °C/W
(1) Min and Max limits are 100% production tested at an ambient temperature (T
A
) 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) θ
JA
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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