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PDF SEA05L Data sheet ( Hoja de datos )

Número de pieza SEA05L
Descripción Advanced constant voltage and constant current controller
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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SEA05L
Advanced constant voltage and constant current controller
with very efficient LED pilot-lamp driver
Preliminary data
Features
Constant voltage and constant current control
Very efficient LED pilot-lamp driver
Wide operating VCC range (3.5 V - 36 V)
Low quiescent consumption: 250 µA
Voltage reference: 2.5 V
Voltage control loop accuracy ± 0.5%
Current sense threshold: 50 mV
Current control loop accuracy ± 4%
Low external component count
Open-drain output stage
SOT23-6L package
Applications
AC-DC adapter with LED pilot-lamp
Battery chargers with LED pilot-lamp
SMPS with LED pilot-lamp
Description
The device is a highly integrated solution for
SMPS applications, with an LED pilot-lamp
requiring a dual control loop to perform CV
(constant voltage) and CC (constant current)
regulation.
The IC allows very efficient LED pilot-lamp driving
which helps to reduce the standby consumption of
the SMPS. It integrates a voltage reference, two
op-amps (with OR-ed open-drain outputs), a low-
side current sensing circuit and an LED pilot-lamp
driver pin implemented with an open-drain mosfet
driven by square waveform with 12.5% duty cycle
at 1 kHz that allows reducing LED consumption.
SOT23-6L (plastic package)
Figure 1. Block diagram
1.23 V
2.5 V
+
-
V CC
6
50mV
+
-
5
3
4
2
GND
1 OSC
Isense
Out
Vctrl
LD
The voltage reference, along with one op-amp, is
the core of the voltage control loop. The current
sensing circuit and the other op-amp make up the
current control loop.
The external components needed to complete the
two control loops are:
- a resistor divider that senses the output of the
power supply and fixes the voltage regulation
setpoint at the specified value
- a sense resistor that feeds the current sensing
circuit with a voltage proportional to the DC output
current; this resistor determines the current
regulation setpoint and must be adequately rated
in terms of power dissipation
- the frequency compensation components (R-C
networks) for both loops.
The device is ideal for space-critical applications.
Table 1. Device summary
Order code
Package
SEA05LTR
SOT23-6L
Packing
Tape & reel
February 2011
Doc ID 18462 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/12
www.st.com
1

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SEA05L pdf
SEA05L
Operation
Table 5.
Symbol
Electrical characteristics (–25 C° < Tj < 125 °C, VCC = 20 V; unless otherwise specified)
Parameter
Test condition
Min. Typ. Max. Unit
Device supply
VCC Voltage operating range
ICC
Quiescent current
(Ictrl = Vsense = 0, OUT = open)
3.5 36 V
250 500 µA
Voltage control loop op-amp
Gmv
Vctrl
Transconductance (sink current only)(1)
Voltage reference default value(2)
Ibias Inverting input bias current
Tj = 25 °C
1 3.5
S
2.488 2.5 2.512 V
25 nA
Current control loop
Gmi
Vcsth
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
VOUTlow Low output level at 2 mA sink current
LED driver
200 400 mV
ILD
fLD
VLDlow
LED driver sink current capability (peak)
LED driver current modulation frequency
Low output level at 5 mA sink current
(internal mosfet on)
ILD_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
5/12

5 Page





SEA05L arduino
SEA05L
4 Revision history
Table 7. Document revision history
Date
Revision
23-Feb-2011
1 Initial release.
Revision history
Changes
Doc ID 18462 Rev 1
11/12

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