Datasheet
SEA05L Operation
Doc ID 18462 Rev 1 5/12
Table 5. Electrical characteristics (–25 C° < T
j
< 125 °C, V
CC
= 20 V; unless otherwise specified)
Symbol Parameter Test condition Min. Typ. Max. Unit
Device supply
V
CC
Voltage operating range 3.5 36 V
I
CC
Quiescent current
(Ictrl = Vsense = 0, OUT = open)
250 500 µA
Voltage control loop op-amp
Gm
v
Transconductance (sink current only)
(1)
13.5 S
Vctrl Voltage reference default value
(2)
T
j
= 25 °C 2.488 2.5 2.512 V
Ibias Inverting input bias current 25 nA
Current control loop
Gm
i
Transconductance (sink current only)
(3)
1.5 7 S
V
csth
Current sense threshold at I(Iout) = 1 mA
(4)
48 50 52 mV
Ibias Non-inverting input source current 6 µA
Output stage
V
OUTlow
Low output level at 2 mA sink current 200 400 mV
LED driver
I
LD
LED driver sink current capability (peak) 10 mA
f
LD
LED driver current modulation frequency 0.6 1 1.4 kHz
V
LDlow
Low output level at 5 mA sink current
(internal mosfet on)
450 900 mV
I
LD_LKG
LED driver leakage current
(internal mosfet off)
0.5 µA
1. If the voltage on Vctrl (the negative input of the amplifier) is higher than the positive amplifier input, and it is increased by
1mV, the sinking current at the output OUT will be increased by 3.5 mA.
2. The internal voltage reference is set at 2.5 V. The voltage control loop precision takes into account the cumulative effects of
the internal voltage reference deviation as well as the input offset voltage of the transconductance operational amplifier.
The internal voltage reference is fixed by bandgap, and trimmed to 0.48 % accuracy at room temperature.
3. When the inverting input at Isense is greater than 50 mV, and the voltage is increased by 1 mV, the sinking current at the
output Out will be increased by 7 mA.
4. The internal current sense threshold is triggered when the voltage on pin Isense is 50 mV. The current control loop
precision takes into account the cumulative effects of the internal voltage reference deviation as well as the input offset
voltage of the transconductance operational amplifier.