SEA05 Datasheet, PDF (4/10 Pages) STMicroelectronics – Advanced constant voltage and constant current controller

Electrical characteristics
4
Electrical characteristics
SEA05
-25 °C <T_J < 125 °C, V_CC = 20 V; unless otherwise specified
Table 5.
Symbol
Electrical characteristics
Parameter
Test condition
Min. Typ. Max. Unit
Device supply
Vcc Voltage operating range
Icc
Quiescent current (Ictrl =I
sense = 0 V, OUT = open)
3.5
36
V
200 300 µA
Voltage control loop op-amp
Gm_v
V_ctrl
Ibias
Transconductance
(sink current only) ⁽¹⁾
Voltage reference default
value ⁽²⁾
T_J = 25 °C
Inverting input bias current
1 3.5
S
2.488 2.5 2.512
V
2.48
2.52
25
nA
Current control loop
Gm_i
V_csth
Ibias
Transconductance
(sink current only) ⁽³⁾
Current sense threshold
V_csth = V_(Isense)-V_(Ictrl)
(4)_{@ I(Iout) = 1 mA}
Non-inverting input source
current @ V(Ictrl) = -50 mV
1.5 7
S
46 50 54 mV
6
µA
Output stage
V_OUTlow
Low output level @ 2 mA
sink current
200 400 mV
1. If the voltage on Vctrl (the negative input of the amplifier) is higher than the positive amplifier input, and it is
increased by 1 mV, the sinking current at the output OUT is 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 positive input at Ictrl is lower than -50 mV, and the voltage is decreased by 1 mV, the sinking
current at the output out is increased by 7 mA.
4. Considering Ictrl pin directly connected to the hot (negative) end of the current sense resistor and Isense
pin connected to the cold end of the current sense resistor through a decoupling resistor (see fig.3), the
internal current sense threshold is triggered when the voltage on pin Ictrl is -50 mV. The current loop
reference 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.
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