TLC5960
SBVS147 –SEPTEMBER 2010
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CHANNEL-TO-CHANNEL CONSTANT CURRENT MISMATCH RATING
The current mismatch rate between channels is primarily induced by the external sense resistor mismatch rating.
Additionally, the TLC5960 driver input offset contributes to the current mismatch rating between the channels.
The gate drive amplifier offset (VOFFSET) is specified in the Electrical Characteristics.
VREG5
D1
G1
VREF
0.6V
VS + DVS
RS + DRS
S1
Channel 1
Figure 17. Channel-to-Channel Mismatch Factors
Figure 17 shows the mismatch contributing factors on this system. ΔRS represents the resistor mismatch. ΔVS
denotes the contribution of the gate amplifier input equivalent offset, VOFFSET. Using these two external and
internal error factors, the total mismatch rate is estimated in Equation 3. In this case, with a 1% accurate RS
used, the total current mismatch value is estimated within 1.9%.
VS + DVS
RS + DRS
VS
RS
DVS DRS
-
ILED
=
»
1 +
VS
RS
VS DVS DRS
-
DILED
=
RS
VS
RS
(3)
14
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