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(R)
TSM102/A
DUAL OPERATIONAL AMPLIFIER - DUAL COMPARATOR AND ADJUSTABLE VOLTAGE REFERENCE
. . . . . . . . . . .
OPERATIONAL AMPLIFIERS LOW SUPPLY CURRENT : 200A/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 : 200A/amp. (VCC = 5V) INPUT COMMON MODE VOLTAGE RANGE INCLUDES GROUND LOW OUTPUT SATURATION VOLTAGE : 250mV (Io = 4mA)
N DIP16 (Plastic Package)
REFERENCE ADJUSTABLE OUTPUT VOLTAGE : Vref to 32V SINK CURRENT CAPABILITY : 1 to 100mA 1% and 0.4% VOLTAGE PRECISION LACTH-UP IMMUNITY
D SO16 (Plastic Micropackage)
ORDER CODES
Part number TSM102I TSM102AI Temperature Range -40oC, +85oC -40 C, +85 C
o o
Package N * * D * *
PIN CONNECTIONS
Output 1
Inverting Input 1 Non-inve rting Input 1
1 2 3
COMP COMP
16
Output 4
Inve rting Input Non-inverting Input 4
V
15
14
V
CC
+
4
5
13
CC
-
Non-inve rting Input 2 Inverting Input 2
12
Non-inverting Input 3 Inve rting Input 3
DESCRIPTION The TSM102 is a monolithic IC that includes two op-amps, two comparators and a precision voltage reference. This device is offering space and cost saving in many applications like power supply management or data acquisition systems.
February1999
6
11
Output 2 Vref
7
10
Output 3
Ca thode
8
9
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TSM102
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Vid Vi Toper Tj Parameter Supply Voltage Differential Input Voltage Input Voltage Operating Free-air Temperature Range Maximum Junction Temperature Thermal Resistance Juction to Ambient (SO package) Value 36 36 -0.3 to +36 -40 to +125 150 150 Unit V V V o C o C o C/W
ELECTRICAL CHARACTERISTICS VCC+ = 5V, VCC- = 0V, Tamb = 25oC (unless otherwise specified)
Symbol ICC Parameter Total Supply Current Tmin. < Tamb < Tmax. Min Typ 0.8 Max 1.5 2 Unit mA
OPERATIONAL AMPLIFIERS VCC+ = 5V, VCC = GND, R1 connected to VCC/2,Tamb = 25oC (unless otherwise specified)
Symbol Vio DVio Iib Iio Avd Parameter Input Offset Voltage Tmin. Tamb Tmax. Input Offset Voltage Drift Input Bias Current Tmin. Tamb Tmax. Input Offset Current Tmin. Tamb Tmax. Large Signal Voltage Gain + R1 = 10k, VCC = 30V, Vo = 5V to 25V Tmin. Tamb Tmax. Supply Voltage Rejection Ratio VCC = 5V to 30V Input Common Mode Voltage Range Tmin. Tamb Tmax. Common Mode Rejection Ratio + + VCC = 30V, Vicm = 0V to (VCC ) -1.8V Output Short Circuit Current Vid = 1V, Vo = 2.5V Source Sink High Level Output Voltage RL = 10k + VCC = 30V Tmin. Tamb Tmax. Low Level Output Voltage RL = 10k Tmin. Tamb Tmax. Slew Rate VCC = 15V Vi = 10V, RL = 10k, CL = 100pF Gain Bandwidth Product R L = 10k, C L = 100pF, f = 100kHz Phase Margin R L = 10k,CL = 100pF Total Harmonic Distortion Equivalent Input Noise Voltage f = 1kHz Channel Separation Min. Typ. 1 10 20 5 Max. 4.5 6.5 100 200 20 40 Unit mV V/oC nA nA
50 25 80 + (VCC ) to (VCC ) -1.8 + (VCC ) to (VCC ) -2.2 70
100
V/mV dB
SVR Vicm CMR Isc
100 V 90 dB mA
3 3 27 26
6 6 V 28 100 150 210 mV V/s
VOH VOL SR
1.6
2
GBP m THD en Cs
1.4
2.1
MHz Degrees
45 % 0.05 29 120 nV Hz dB
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TSM102
COMPARATORS VCC+ = +5V, VCC = Ground, Tamb = 25oC (unless otherwise specified)
Symbol Vio Iio Iib IOH VOL Avd Isink Vicm Vid tre trel
Note 1 :
Parameter Input Offset Voltage Tmin. Tamb Tmax. Input Offset Current Tmin. Tamb Tmax. Input Bias Current Tmin. Tamb Tmax. High Level Output Current Vid = 1V, VCC = Vo = 30V Tmin. Tamb Tmax. Low Level Output Voltage Vid = -1V, Isink = 4mA Tmin. Tamb Tmax. Large Signal Voltage Gain R1 = 15k, VCC = 15V, Vo = 1 to 11V Output Sink Current Vid = -1V, Vo = 1.5V Input Common Mode Voltage Range Tmin. Tamb Tmax. Differential Input Voltage Response Time - (note 1) R1 = 5.1k to VCC+, Vref = 1.4V Large Signal Response Time + Vref = 1.4V, Vi = TTL, R1 = 5.1k to VCC
Min.
Typ.
Max. 5 9 50 150 250 400 1
Unit mV nA nA nA A mV
0.1
250
400 700 V/mV
6 0 0
200 16 VCC+ -1.5 VCC+ -2 + VCC 1.3 300
mA V V s ns
The response time specified is for 100mV input step with 5mV overdrive. For larger overdrive signals, 300ns can be obtained.
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TSM102
VOLTAGE REFERENCE
Symbol VKA IK Parameter Cathode to Anode Voltage Cathode Current Value Vref to 36 1 to 100 Unit V mA
ELECTRICAL CHARACTERISTICS Tamb = 25oC (unless otherwise specified)
Symbol Vref Vref Vref T Vref VKA Iref Parameter Reference Input Voltage - (figure 1) - Tamb = 25 C TSM102, VKA = Vref, IK = 10mA TSM102A, VKA = Vref, IK = 10mA Reference Input Voltage Deviation Over Temperature Range - (figure 1, note1) VKA = Vref, IK = 10mA, Tmin. Tamb Tmax. Temperature Coefficient of Reference Input Voltage - (note 2) VKA = Vref, IK = 10mA, Tmin. Tamb Tmax. Ratio of Change in Reference Input Voltage to Change in Cathode to Anode Voltage - (figure 2) IK = 10mA, VKA = 36 to 3V Reference Input Current - (figure 2) IK = 10mA, R1 = 10k, R 2 = o T amb = 25 C T min. Tamb Tmax. Reference Input Current Deviation Over Temperature Range - (figure 2) IK = 10mA, R1 = 10k, R 2 = T min. Tamb Tmax. Minimum Cathode Current for Regulation - (figure 1) VKA = Vref Off-State Cathode Current - (figure 3)
o
Min. 2.475 2.490
Typ. 2.500 2.500
Max. 2.525 2.510
Unit V
mV 7 22 30 ppm/ C 100 mV/V -1.1 -2 A 1.5 2.5 3 A 0.5 1 mA 0.5 180 1 500 nA
o
Iref
Imin Ioff
Notes : 1.
Vref is defined as the difference between the maximum and minimum values obtained over the full temperature range. Vref = Vref max. - Vref min V
ref ma x.
V re f min. T1 T2 Te mpe rature
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.
-n pp m / C
ma x 2.5V m in
p pm +n
/C
25 C
Te mp e ra ture
3.
VKA The dynamic Impedance is defined as |ZKA| = IK
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TSM102
Figure 1 : Test Circuit for VKA = Vref Input
I V
KA
K
V
re f
Figure 2 : Test Circuit for VKA > Vref
Input IK I re f VKA
R1
R2
Vre f
VKA = Vref (1 +
R1 ) + Iref . R1 R2
Figure 3 : Test Circuit for Ioff
Input I o ff
VKA = 36V
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TSM102
APPLICATION NOTE A Li-Ion BATTERY CHARGER USING TSM102A
by R. LIOU 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 Operational Amplifiers, two Comparators and one adjustable precision Voltage Reference (2.5V to 36V, 0.4% or 1%). TSM102 can sustain up to 36V power supply voltage.
. . .
Figure 1 : TSM102 Pinout
1 2 3
TS M102
16
15
14
COMP
V
CC
COMP
V
CC
+
5
-
12
6
11
7
10
Vref
Ca tho de
2 - APPLICATION CONTEXT AND PRINCIPLE OF OPERATION In the battery charging field which requires ever increasing performances in more and more reduced space, the TSM102A provides an attractive solution 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 Amplifiers perform current and voltage control, the two Comparators provide "End of Charge" and "Low Battery" signals and the Voltage Reference ensures 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 auxiliary 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 charger's 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 ORing diodes (D1, D2) and an optocoupler (D3). The compensation loops of these regulation functions are ensured by the capacitors C1 and C2.
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TSM102
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 charger's output voltage (resistor bridge R17, R19) and the reference voltage. Proper hysteresis is given thanks to R20. An improvement to the chargers security and to the battery's life time optimization is achieved by lowering the current control measurement thanks to Q1 that shunts the resistor R9 when the battery's voltage is below the "Low Battery" level. The second comparator ensures the "End of Charge" signal generation thanks to the comparison of a part of the charger's output voltage (resistor bridge R1, R2, R3) and the reference voltage. When either of these two signals is active, the corresponding LED is polarized for convenient visualization of the battery status. 3 - CALCULATION OF THE ELEMENTS
. . .
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 reference 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
.
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 :
Vout = Vref / [ R2 / (R1 + R2 + R3) ]
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TSM102
= 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 :
= Vref / [ (R2 + R3 ) / (R1 + R2 + R3) ] = 2.5 / [ (56 + 0.68) / (131.5 + 56 + 0.68) ] = 8.300V Vout (EOC)= 8.300V Vout(EOC)
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 discharge if the charger is disconnected from main, but remains connected to the battery by mistake. The chosen values impose a 44A discharge current max. R12 and R13 are the equivalentresistors seen from the opamp and from the comparator. A hysteresis resistor can be connected to the "End Of Charge" comparator to ensureproper hysteresis to this signal, but this resistor must be chosen carefully not to degrade the output voltage precision. 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
Notes: The current control values must be chosen in accordancewith 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.
Figure 3 : A precise power supply for the TSM102A and other components
Vaux
Vcc
+ 9 13 TSM102 Vref 8
Vaux +
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TSM102
PACKAGE MECHANICAL DATA 16 PINS - PLASTIC PACKAGE
Dim. a1 B b b1 D E e e3 F i L Z
Min. 0.51 0.77
Millimeters Typ.
Max. 1.65
Min. 0.020 0.030
Inches Typ.
Max. 0.065
0.5 0.25 20 8.5 2.54 17.78 7.1 5.1 3.3 1.27
0.020 0.010 0.787 0.335 0.100 0.700 0.280 0.201 0.130 0.050
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TSM102
PACKAGE MECHANICAL DATA 16 PINS - PLASTIC MICROPACKAGE (SO)
Dim. A a1 a2 b b1 C c1 D E e e3 F G L M S
Min. 0.1 0.35 0.19
Millimeters Typ.
Max. 1.75 0.2 1.6 0.46 0.25 45 (typ.)
o
Min. 0.004 0.014 0.007
Inches Typ.
Max. 0.069 0.008 0.063 0.018 0.010
0.5 9.8 5.8 1.27 8.89 3.8 4.6 0.5 4.0 5.3 1.27 0.62 8 (max.)
o
0.020 10 6.2 0.386 0.228 0.050 0.350 0.150 0.181 0.020 0.157 0.209 0.050 0.024 0.394 0.244
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this pub lication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
(c) The ST logo is a trademark of STMicroelectroni cs (c) 1999 STMicroelectro nics- Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES
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