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PDF L6615DTR Data sheet ( Hoja de datos )

Número de pieza L6615DTR
Descripción HIGH/LOW SIDE LOAD SHARE CONTROLLER
Fabricantes STMicroelectronics 
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L6615
HIGH/LOW SIDE LOAD SHARE CONTROLLER
s SSI SPECS COMPLIANT
s HIGH/LOW SIDE CURRENT SENSING
s FULLY COMPATIBLE WITH REMOTE
OUTPUT VOLTAGE SENSING
s FULL DIFFERENTIAL LOW OFFSET
CURRENT SENSE
s 2.7V TO 22V VCC OPERATING RANGE
s 32kSHARE SENSE AMPLIFIER INPUT
IMPEDANCE
s HYSTERETIC UVLO
APPLICATION
s DISTRIBUTED POWER SYSTEMS
s HIGH DENSITY DC-DC CONVERTERS
s (N+1) REDUNDANT SYSTEMS, N UP TO 20
s SMPS FOR (WEB) SERVERS
DESCRIPTION
This controller IC is specifically designed to
BCD TECHNOLOGY
DIP8
SO8
ORDERING NUMBERS:
L6615N
L6615D
L6615DTR(T & Reel)
achieve load sharing of paralleled and indepen-
dent power supply modules in distributed power
systems, by adding only few external components.
Current sharing is achieved through a single wire
connection (share bus) common to all of the paral-
leled modules.
TYPICAL APPLICATION DIAGRAM
+OUT
+OUT_S
-OUT_S
-OUT
PS #1
+OUT
+OUT_S
-OUT_S
-OUT
PS #N
RSENSE
(*)
RADJ
RG1
RG2
1 GND
VCC 8
2 CS-
CGA 7
3 CS+ SHARE 6
4 ADJ
COMP 5
L6615
CC
RSENSE
RC
(*)
RADJ
RCGA
RG1
RG2
1 GND
VCC 8
2 CS-
CGA 7
3 CS+ SHARE 6
4 ADJ
COMP 5
L6615
CC
RC
SHARE BUS
RCGA
+OUT
GND
LOAD
(*) OR-ing FET can
be used to reduce
power dissipation
July 2003
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L6615DTR pdf
L6615
ELECTRICAL CHARACTERISTCS (continued)
(Tj = -40 to 85°C, Vcc=12V, VADJ = 12V, CCOMP = 5nF to GND, RCGA = 16k, unless otherwise specified;
VSENSE = IL * RSENSE, RG1 = RG2 = 200)
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
IOH Source current
VCOMP=1.5V, V SH 300mV,
VSENSE=-10mV
-150 -350 -400 µA
IOL Sink current
VCOMP= 1.5V, VSENSE=-10mV
200resistor SH to GND
100 200 300
µA
VCOMP(L) Low voltage
0.05 0.15 0.25
VZ Clamp Zener voltage
IZ = 1mA
1.5 V
ADJ AMPLIFIER
IADJ Max. ADJ output current
VSH= 1V, VSENSE= 0V
6.5 10 13 mA
VT Threshold voltage
IADJ=10µA
0.7 V
RA Emitter resistor
Guaranteed by design
60 100 140
VADJ(MIN) Low saturation voltage
IADJ=5mA
1V
IADJ=1mA
0.4 V

(*)
Mirror
accuracy
is
defined
as
=:
----------------V----S----H-----------------
VSENSE
R-----C----G----A-
RG
1
100
and it represents the accuracy of the transfer between the voltage sensed and the voltage imposed on the
share bus.
BLOCK DIAGRAM
CS+
3
CS-
2
CGA 7
ICGA
CURRENT SENSE
AMPLIFIER (CSA)
UVLO
+R
_
R
SHARE SENSE
AMPLIFIER (SSA)
+
_
R
ADJ 4
40 mV
+
_
RA
ADJ OUTPUT
AMPLIFIER (AOA)
BIAS
R
24V
R
8 VCC
R
R
R
+
_
Gm ERROR
AMPLIFIER (E/A)
_
+
SHARE DRIVE
AMPLIFIER (SDA)
6 SH
5 COMP
1.5V
0.7V
1
GND
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L6615DTR arduino
L6615
– maximum share bus voltage is internally limited up to 2.2V below L6615 VCC voltage (pin#8);
– VSH(MAX) represents an upper limit but the designer should select the full scale share bus voltage
keeping in mind that every Volt on the share bus will increase the master controller's supply current
by approximately 45µA for each slave unit connected in parallel; this total current, provided by the
master share drive amplifier, must be lower than its minimum output capabilty (8mA) so
VSH(MA
X)
<
-R----i-(--M-----I-N-----)
N
8mA
This condition is not tough to meet in normal applications, as one can easily see by using sensible
values for N (number of paralleled power supplies) and VSH(MAX). For example, with VSH(MAX)=8V,
solving for N, we obtain Nmax=20;
– maximum share drive amplifier current capability (ICGA(MAX)=2mA);
– for safety reasons the following relation must be met:
RG
>
1--
2
---V----o---u---t--
10mA
40
in this way no fault will cause ICS+ (or ICS-) to overcome its absolute maximum ratings.
At full load, VSENSE(MAX) = IOUT(MAX) · RSENSE(MAX) is the maximum voltage drop across the resistor
RSENSE (typically few hundreds of millivolt).
IOUT(MAX) is the maximum current carried by each of the paralleled power supply; in non redundant sys-
tems composed by N power supplies, each of them works at its nominal current, so:
IOUT(MAX)
=
I--L---O-----A---D--
N
This relationship is true also in N+M redundant system, even if under normal condition each power supply
provides ILOAD/(N+M).
For example in a system composed by two paralleled power supplies 100% redundant (N=M=1), each
module is sized to sustain the entire load current (in normal operation it carries only one half): for this rea-
son the sense resistor must be sized considering the whole load current.
The temperature variation of the sense resistor (hence of its resistance value) has to be taken into ac-
count, so RSENSE(MAX) is the value at maximum operating temperature to avoid saturating the share bus.
Once fixed VSENSE(MAX), the ratio RCGA/RG (gain from the sensing section to the share bus) can be cal-
culated:
-R----C----G----A-- = ------V----S----H----(--M----A----X---)------
RG VSENSE(MAX)
where VSH(MAX) is defined by the application.
A small capacitor in parallel to RCGA is useful to reduce the noise.
The effect of current sharing feedback loop is to force the voltages of the slave's CGA pins to be equal to
VSH (that is to reduce the voltage difference at the inputs of the L6615 error amplifier). For the sake of
simplicity we consider 2 paralleled power supplies (as in fig. 11): under closed loop condition:
IOUT(1)
R-----S----N---S----(--1---)
RG(1)
RCGA(1)
=
IOUT(2)
R-----S----N----S---(--2---)
RG(2)
RCGA(2)
Ideally all the external component and α are matched so:
IOUT(1)
=
IOUT(2)
=
-I-L----O----A---D--
2
Any mismatch will have repercussion on the sharing precision: in particular the maximum difference be-
tween the output currents (sharing error) will be given by the sum of the mismatches amongst the relevant
values.
11/20

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