Datasheet

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1 Applications
LED driver and constant current regulator
Architectural LED lighting drivers
Automotive LED drivers
General LED illumination
2 TPS92641EVM Electrical Performance Specifications
Table 1 provides a summary of the TPS92641EVM performance specifications. All specifications are given
for an ambient temperature of 25°C.
Table 1. TPS92641EVM Electrical and Performance Specifications
Parameter Notes and Conditions
(1)
Min Typ Max Unit
Input Characteristics
V
IN
Input voltage 43 48 53 V
UDIM logic high (PWM F
UDIM
= 200 Hz 1.3 5.5 V
UDIM
dimming)
I
Q
Input quiescent current Device enable, V
IN
= 48 V, V
UDIM
= 1 V, no switching 3 mA
Output Characteristics
V
OUT
Output voltage LED+ (TP5) to GND (TP4)
(2)
32 33 V
I
LED
LED current R5 = 10 kΩ, R6 = 19.6 kΩ, R10 = 0.2 Ω 970 1000 1030 mA
Systems Characteristics
F
SW
Switching frequency R1 = 32.4 kΩ, C6 = 1 nF, R7 = 340 kΩ, R8 = 22.6 kΩ 450 500 kHz
(1)
Estimate the input current by solving the power balance equation, eff = P
OUT
/ P
IN
= (V
OUT
× I
LED
) / (V
IN
× I
IN
), for I
IN
and estimating
the efficiency to be a conservative 85%. For example, for V
OUT
= 32.5 V, V
IN
= 48 V and I
LED
= 1 A , then I
IN
= (32.5 V × 1 A) / (48
V × 0.85) = 0.797 A.
(2)
This voltage is load dependent, the nominal forward voltage drop, V
F
of the LED used is 3.25 V per LED running at 1 A.
2
User's Guide for the TPS92641EVM SLVU823–December 2012
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