TSM102/A Datasheet by STMicroelectronics

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OPERATIONAL AMPLIFIERS
LOW SUPPLY CURRENT : 200µA/amp.
MEDIUM SPEED : 2.1MHz
LOW LEVEL OUTPUT VOLTAGE CLOSE TO
VCC- : 0.1V typ.
INPUT COMMON MODE VOLTAGE RANGE
INCLUDES GROUND
COMPARATORS
LOW SUPPLY CURRENT : 200µA/amp.
(VCC = 5V)
INPUT COMMON MODE VOLTAGE RANGE
INCLUDES GROUND
LOW OUTPUT SATURATION VOLTAGE :
250mV (Io = 4mA)
REFERENCE
ADJUSTABLE OUTPUT VOLTAGE :
Vref to 36V
SINK CURRENT CAPABILITY : 1 to 100mA
1% and 0.4% VOLTAGE PRECISION
LACTH-UP IMMUNITY
DESCRIPTION
The TSM102 is a monolithic IC that includes two
op-amps, two comparators and a precision volt-
age reference. This device is offering space and
cost saving in many applications like power supply
management or data acquisition systems.
ORDER CODE
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
Part Number Temperature
Range
Package
D
TSM102I -40°C, +85°C
TSM102AI -40°C, +85°C
D
SO16
(Plastic Micropackage)
1
2
3
4
13
14
15
16
5
6
7
8
12
11
10
9
Output 1
Inverting Input 1
Non-inverting Input 1
V
CC
+
Non-inverting Input 2
Inverting Input 2
Output 2
Vref
Output 4
Inverting Input
Non-inverting Input 4
Non-inverting Input 3
Inverting Input 3
Output 3
Cathode
V
CC
-
COMP COMP
TSM102/A
VOLTAGE AND CURRENT CONTROLLER
January 2004
k9 k9
TSM102/A
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ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
VCC+ = 5V, VCC- = 0V, Tamb = 25°C (unless otherwise specified)
OPERATIONAL AMPLIFIER
VCC+ = 5V, VCC = GND, R1 connected to Vcc/2, Tamb = 25°C (unless otherwise specified)
Symbol Parameter Value Unit
VCC DC supply Voltage 36 V
Vid Differential Input Voltage 36 V
ViInput Voltage -0.3 to +36 V
Toper Operating Free-air Temperature Range -40 to +125 °C
TjMaximum Junction Temperature 150 °C
Thermal Resistante Junction to Ambient 150 °C/W
Symbol Parameter Min. Typ Max. Unit
ICC Total Supply Current
Tmin. Tamb Tmax
0.8 1.5
2mA
Symbol Parameter Min. Typ. Max. Unit
Vio Input Offset Voltage
Tmin Tamb Tmax
14.5
6.5 mV
DVio Input Offset Voltage Drift 10 µV/°C
Iib Input Bias Current
Tmin Tamb Tmax
20 100
200 nA
Iio Input Offset Current
Tmin Tamb Tmax
520
40 nA
Avd
Large Signal Voltage Gain
R1=10k, Vcc+ = 30V, Vo = 5V to 25V
Tmin Tamb Tmax
50
25 100 V/mV
SVR Supply Voltage Rejection Ratio
Vcc = 5V to 30V 80 100 dB
Vicm Input Common Mode Rejection Ratio
Tmin Tamb Tmax
(Vcc-) to (Vcc+) -1.8
(Vcc-) to (Vcc+) -2.2
V
CMR Common Mode Rejection Ratio
Vcc+ = 30V, Vicm = 0V to (Vcc+) -1.8 70 90 dB
Isc
Output Short Circuit Current
Vid = ±1V, Vo = 2.5V
Source
Sink
3
36
6
mA
VOH
High Level Output Voltage RL = 10k
Vcc+ = 30V
Tmin Tamb Tmax
27
26 28 V
VOL Low Level Output Voltage RL = 10k
Tmin Tamb Tmax
100 150
210 mV
SR
Slew Rate
Vcc = ±15V
Vi = ±10V, RL = 10k, CL = 100pF
1.6 2 V/µs
2 V Ln amb cc cc
TSM102/A
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COMPARATORS
VCC+ = 5V, VCC = Ground, Tamb = 25°C (unless otherwise specified)
VOLTAGE REFERENCE
GBP Gain Bandwidth Product
RL = 10k, CL = 100pF, f = 100kHZ 1.4 2.1 MHz
mPhase Margin
RL = 10k, CL = 100pF 45 Degrees
THD Toatal Harmonic Distortion 0.05 %
enEquivalent Input Noise Voltage
f = 1kHz 29
Symbol Parameter Min. Typ Max. Unit
Vio Input Offset Voltage
Tmin Tamb Tmax
5
9mV
Iio Input Offset Current
Tmin Tamb Tmax
50
150 nA
Iib Input Bias Current
Tmin Tamb Tmax
250
400 nA
IOH
High Level Output Current
Vid = 1V, Vcc = Vo = 30V
Tmin Tamb Tmax
0.1 1nA
µA
VOL
Low Level Output Voltage
Vid = -1V, Isink = 4mA
Tmin Tamb Tmax
250 400
700
mV
Avd Large Signal Voltage Gain
R1 = 15k, Vcc = 15V, Vo = 1 to 11V 200 V/mV
Isink Output Sink Current
Vid = -1V, Vo = 1.5V 616 mA
Vicm Input Common Mode Voltage Range
Tmin Tamb Tmax
0
0
Vcc+-1.5
Vcc+-2
V
Vid Differential Input Voltage Vcc+V
tre Response Time 1)
R1 = 5.1k to Vcc+ ,Vref = 1.4V
1. The response time specified is for 100mV input step with 5mV overdrive.
For larger overdrive signals, 300ns can be obtained.
1.3 µs
trel Large Signal Response Time
Vref = 1.4V, Vi = TTL, R1 = 5.1k to Vcc+300 ns
Symbol Parameter Value Unit
VKA Cathode to Anode Voltage Vref to 36 V
IkCathode Current 1 to 100 mA
Symbol Parameter Min. Typ. Max. Unit
nV
Hz
------------
amt:
TSM102/A
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ELECTRICAL CHARACTERISTICS
Tamb = 25°C (unless otherwise specified)
Symbol Parameter Min. Typ Max. Unit
Vref
Reference Input Voltage -(figure1)- Tamb = 25°C
TSM102, VKA = Vref, IK = 10mA
TSM102A, VKA = Vref, IK = 10mA
2.475
2.490 2.500
2.500 2.525
2.510
V
Vref
Reference Input Voltage Deviation Over
Temperature Range -(figure1, note1))
VKA = Vref , IK = 10mA, Tmin Tamb Tmax
1. Vref is defined as the difference between the maximum and minimum values obtained over the full temperature range.
Vref= Vref max. - Vref min
730
mV
Temperature Coefficient of Reference Input Voltage - note2)
VKA = Vref , IK = 10mA, Tmin Tamb Tmax
2. The temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits whithin
which the reference voltage is guaranteed.
±22 ±100
ppm/°C
Ratio of Change in Reference Input Voltage to Change in Cath-
ode to Anode Voltage -(figure2)
IK = 10mA, VKA = 36 to 3V -1.1 -2
mV/V
Iref
Reference Input Current -(figure2)
IK = 10mA, R1 = 10k, R2 =
Tamb = 25°C
Tmin Tamb Tmax
1.5 2.5
3
µA
Iref
Reference Input Current Deviation Over
Temperature Range -(figure2)
IK = 10mA, R1 = 10k, R2 =
Tmin Tamb Tmax
0.5 1
µA
Imin Minimum Cathode Current for Regulation -(figure1)
VKA = Vref 0.5 1 mA
Ioff Off-State Cathode Current -(figure3) 180 500 nA
Vref
T
---------------
Vref
VKA
----------------
T1 T2 Temperature
V
ref max.
V
ref min.
25°C Temperature
max
2.5V
min
- n ppm / °C
+ n ppm / °C
' fli’ 77/ :>4«_57 E]
TSM102/A
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Figure 1 : Test Circuit for VKA = Vref
Figure 2 : Test Circuit for VKA > Vref
Figure 3 : Test Circuit for Ioff
VK
A
Vref
Input
IK
VKA
IK
Vref
Iref
R
R
Input
1
2
VKA Vref 1R1
R2
--------+


Iref R1+=
VKA
Input
Ioff
= 36V
6/9
This application note explains how to use the
TSM102 in an SMPS-type battery charger which
features :
Voltage Control
Current Control
Low Battery Detection and End Of Charge
Detection
1 - TSM102 PRESENTATION
The TSM102 integrated circuit includes two Oper-
ational Amplifiers, two Comparators and one ad-
justable precision Voltage Reference (2.5V to
36V, 0.4% or 1%).
TSM102 can sustain up to 36V power supply volt-
age.
Figure 1: TSM102 Pinout
2 - APPLICATION CONTEXT AND PRINCIPLE
OF OPERATION
In the battery charging field which requires ever in-
creasing performances in more and more reduced
space, the TSM102A provides an attractive solu-
tion in terms of PCB area saving, precision and
versatility.
Figure 2 shows the secondary side of a battery
charger (SMPS type) where TSM102A is used in
optimised conditions : the two Operational Amplifi-
ers perform current and voltage control, the two
Comparators provide End of Charge and Low
Battery signals and the Voltage Reference en-
sures precise reference for all measurements.
The TSM102A is supplied by an auxiliary power
supply (forward configuration - D7) regulated by a
bipolar transistor and a zener diode on its base
(Q2 and DZ), and smoothed by the capacitors C3
and C4. R15 polarizes the base of the transistor
and at the same time limits the current through the
zener diode during regulation mode of the auxilia-
ry power supply.
The current and voltage regulations are made
thanks to the two Operational Amplifiers.
The first amplifier senses the current flow through
the sense resistor Rs and compares it with a part
of the reference voltage (resistor bridge R7, R8,
R9). The second amplifier compares the reference
voltage with a part of the chargers output (resistor
bridge R1, R2, R3).
When either of these two operational amplifiers
tends to lower its ouput, this linear information is
propagated towards the primary side via two OR-
ing diodes (D1, D2) and an optocoupler (D3). The
compensation loops of these regulation functions
are ensured by the capacitors C1 and C2.
1
2
3
14
15
16
5
6
7
12
11
10
V
CC
+
Vref
Cathod
e
V
CC
-
COMP COMP
TSM102
APPLICATION NOTE
A BATTERY CHARGER USING THE TSM102
E]
TSM102/A
7/9
Figure 2 : The Application Schematic - Battery Charger Secondary Side
The first comparator ensures the Low Battery
signal generation thanks to the comparison of a
part of the chargers output voltage (resistor
bridge R17, R19) and the reference voltage. Prop-
er hysteresis is given thanks to R20. An improve-
ment to the chargers security and to the batterys
life time optimization is achieved by lowering the
current control measurement thanks to Q1 that
shunts the resistor R9 when the batterys voltage
is below the Low Battery level.
The second comparator ensures the End of
Charge signal generation thanks to the compari-
son of a part of the chargers output voltage (resis-
tor bridge R1, R2, R3) and the reference voltage.
When either of these two signals is active, the cor-
responding LED is polarized for convenient visual-
ization of the battery status.
3 - CALCULATION OF THE ELEMENTS
All the components values have been chosen for a
two-Lithium-Ion batteries charge application :
Current Control : 720mA (Low Battery current
control : 250mA)
Voltage Control : 8.4V (= 2x 4.2V)
Low Battery : 5.6V (= 2x 2.5V + 0.6V)
End of Charge : 8.3V (= 2x 4.15V)
Current Control :
The voltage reference is polarized thanks to the
R4 resistor (2.5mA), and the cathode of the refer-
ence gives a fixed 2.500V voltage.
I = U / R = [Vref( R8 + R9 ) / (R7 + R8 + R9) ] / Rs
= [2.5 x (390 + 820) / (10000 + 390 + 820)] / 0.375
= 720mA
I = 720mA
P = power dissipation through the sense resistor =
R I2 = 0.375 x 0.7202 = 194mW
In case of Low Battery conditions, the current
control is lowered thanks to the following
equation :
I = U / R = [ Vref R8 / (R7 + R8) ] / Rs
= [ 2.5 x 390 / (10000 + 390 ) ] / 0.375
= 250mA
I (LoBatt) = 250mA
Voltage Control :
Vout = Vref / [ R2 / (R1 + R2 + R3) ]
= 2.5 / [ 56 / (131.5 + 56 + 0.68 ) ]
= 8.400V
Vout = 8.400V
Low Battery signal :
If R5 = 0 and R6 = open :
Vout(LoBatt) = Vref / [ R19 / ( R17 + R19 ) ]
= 2.5 / [ 10 / (12.4 + 10) ]
= 5.6V
Vout(LoBatt) = 5.6V
End of Charge signal :
Vout(EOC) = Vref / [ (R2 + R3 ) / (R1 + R2 + R3) ]
= 2.5 / [(56 + 0.68) / (131.5 + 56 + 0.68)]
= 8.300V
Vout (EOC)= 8.300V
HI—- 0
TSM102/A
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Notes:
The current control values must be chosen in ac-
cordance with the elements of the primary side.
The performances of the battery charger in their
globality are highly dependent on the adequation
of the primary and the secondary elements.
The addition of the diode D9 is necessary to avoid
dramatic discharge of the battery cells in case of
the charger disconnection from the mains voltage,
and therefore, the voltage measurement is to be
operated on the cathode side of the diode not to
take its voltage drop into account. The total bridge
value of R1, R2, R3 must ensure low battery dis-
charge if the charger is disconnected from main,
but remains connected to the battery by mistake.
The chosen values impose a 44µA discharge cur-
rent max.
R12 and R13 are the equivalent resistors seen
from the opamp and from the comparator.
A hysteresis resistor can be connected to the End
Of Charge comparator to ensure proper hystere-
sis to this signal, but this resistor must be chosen
carefully not to degrade the output voltage preci-
sion. It might be needed to impose unidirectionnal
hysteresis (by inserting a diode on the positive
feedback of the comparator).
Figure 3 shows how to use the integrated Voltage
Reference to build a precise Power Supply for the
TSM102A (and other components if necessary).
Pin 8 remains the reference for all voltage mea-
surements for the rest of the application.
Figure 3 : A precise power supply for the TSM102A and other components
V
aux
TSM102 Vref
Vcc
+
9
Vaux
13
8
+
14% a
TSM102/A
9/9
PACKAGE MECHANICAL DATA
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 1.75 0.068
a1 0.1 0.2 0.004 0.008
a2 1.65 0.064
b 0.35 0.46 0.013 0.018
b1 0.19 0.25 0.007 0.010
C 0.5 0.019
c1 45˚ (typ.)
D 9.8 10 0.385 0.393
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 8.89 0.350
F 3.8 4.0 0.149 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.019 0.050
M 0.62 0.024
S8 ˚ (max.)
SO-16 MECHANICAL DATA
PO13H
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its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
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