SEA05L Datasheet, PDF (5/12 Pages) STMicroelectronics – Advanced constant voltage and constant current controller with very efficient LED pilot-lamp driver

SEA05L
Operation
Table 5.
Symbol
Electrical characteristics (–25 C° < T_j < 125 °C, V_CC = 20 V; unless otherwise specified)
Parameter
Test condition
Min. Typ. Max. Unit
Device supply
V_CC Voltage operating range
I_CC
Quiescent current
(Ictrl = Vsense = 0, OUT = open)
3.5
36
V
250
500 µA
Voltage control loop op-amp
Gm_v
Vctrl
Transconductance (sink current only)⁽¹⁾
Voltage reference default value⁽²⁾
Ibias Inverting input bias current
T_j = 25 °C
1
3.5
S
2.488 2.5 2.512 V
25
nA
Current control loop
Gm_i
V_csth
Ibias
Transconductance (sink current only) ⁽³⁾
Current sense threshold at I(Iout) = 1 mA⁽⁴⁾
Non-inverting input source current
1.5
7
S
48
50
52 mV
6
µA
Output stage
V_OUTlow Low output level at 2 mA sink current
LED driver
200
400 mV
I_LD
f_LD
V_LDlow
LED driver sink current capability (peak)
LED driver current modulation frequency
Low output level at 5 mA sink current
(internal mosfet on)
I_{LD_LKG}
LED driver leakage current
(internal mosfet off)
10
mA
0.6
1
1.4 kHz
450
900 mV
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.
Doc ID 18462 Rev 1
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