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UC2906 UC3906
Sealed Lead-Acid Battery Charger
FEATURES
* Optimum Control for Maximum Battery Capacity and Life * Internal State Logic Provides Three Charge States * Precision Reference Tracks Battery Requirements Over Temperature * Controls Both Voltage and Current at Charger Output * System Interface Functions * Typical Standby Supply Current of only 1.6mA
DESCRIPTION
The UC2906 series of battery charger controllers contains all of the necessary circuitry to optimally control the charge and hold cycle for sealed lead-acid batteries. These integrated circuits monitor and control both the output voltage and current of the charger through three separate charge states; a high current bulk-charge state, a controlled over-charge, and a precision float-charge, or standby, state. Optimum charging conditions are maintained over an extended temperature range with an internal reference that tracks the nominal temperature characteristics of the lead-acid cell. A typical standby supply current requirement of only 1.6mA allows these ICs to predictably monitor ambient temperatures. Separate voltage loop and current limit amplifiers regulate the output voltage and current levels in the charger by controlling the onboard driver. The driver will supply at least 25mA of base drive to an external pass device. Voltage and current sense comparators are used to sense the battery condition and respond with logic inputs to the charge state logic. A charge enable comparator with a trickle bias output can be used to implement a low current turn-on mode of the charger, preventing high current charging during abnormal conditions such as a shorted battery cell. Other features include a supply under-voltage sense circuit with a logic output to indicate when input power is present. In addition the over-charge state of the charger can be externally monitored and terminated using the over-charge indicate output and over-charge terminate input.
BLOCK DIAGRAM
SINK 16 DRIVER +VIN CURRENT LIMIT 250 mV + C/L C/S OUT C/S + C/S 4 1 3 + 2 SOURCE 15 COMPENSATION 14
VOLTAGE AMPLIFIER 13 VOLTAGE SENSE
CURRENT SENSE
VREF SENSE COMPARATOR
25 mV
HIGH 0.95 VREF LOW 0.90 VREF VREF VREF 2.3 V at -3.5 mV/C 11 ENABLE COMPARATOR 12
+VIN
5
TRICKLE BIAS CHARGE ENABLE STATE LEVEL CONTROL
GND
6
UV SENSE POWER INDICATE 7
VREF
10
9 R OVER-CHARGE TERMINATE L1 8 S S Q R L2 Q
OVER-CHARGE INDICATE
SLUS186B - SEPTEMBER 1996 - REVISED JULY 2003
UC2906 UC3906 ABSOLUTE MAXIMUM RATINGS
Supply Voltage (+VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Open Collector Output Voltages . . . . . . . . . . . . . . . . . . . . . 40V Amplifier and Comparator Input Voltages . . . . . . -0.3V to +40V Over-Charge Terminate Input Voltage . . . . . . . . -0.3V to +40V Current Sense Amplifier Output Current. . . . . . . . . . . . . . 80mA Other Open Collector Output Currents . . . . . . . . . . . . . . . 20mA Trickle Bias Voltage Differential with respect to VIN . . . . . -32V Trickle Bias Output Current . . . . . . . . . . . . . . . . . . . . . . -40mA Driver Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80mA Power Dissipation at TA = 25C (Note 2) . . . . . . . . . . . 1000mW Power Dissipation at TC = 25C (Note 2). . . . . . . . . . . 2000mW Operating Junction Temperature . . . . . . . . . . -55C to +150C Storage Temperature . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300C
CONNECTION DIAGRAMS
PLCC-20, LCC-20 (TOP VIEW) Q, L Packages
Note 1: Voltages are referenced to ground (Pin 6). Currents are positive into, negative out of, the specified terminals. Note 2: Consult Packaging section of Databook for thermal limitations and considerations of packages.
DIL-16, SOIC-16 (TOP VIEW) J or N Package, DW Package
PIN FUNCTION N/C C/S OUT C/SC/S+ C/L N/C +VIN GROUND POWER INDICATE OVER CHARGE TERMINATE N/C OVER CHARGE INDICATE STATE LEVEL CONTROL TRICKLE BIAS CHARGE ENABLE N/C VOLTAGE SENSE COMPENSATION DRIVER SOURCE DRIVER SINK
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -40C to +70C for the UC2906 and 0C to +70C for the UC3906, +VIN = 10V, TA = TJ.
PARAMETER Input Supply Supply Current +VIN = 10V +VIN = 40V Supply Under-Voltage Threshold +VIN = Low to High Supply Under-Voltage Hysteresis Internal Reference (VREF) Voltage Level (Note 3) Measured as Regulating Level at Pin 13 w/ Driver Current = 1mA, TJ = 25C +VIN = 5 to 40V 2.275 2.3 2.325 2.270 2.3 2.330 V 4.2 1.6 1.8 4.5 0.20 3.3 3.6 4.8 0.30 4.2 1.6 1.8 4.5 0.20 3.3 3.6 4.8 0.30 mA mA V V TEST CONDITIONS MIN UC2906 TYP MAX MIN UC3906 TYP MAX UNITS
Line Regulation Temperature Coefficient
3 -3.5
8
3 -3.5
8
mV mV/C
2
UC2906 UC3906 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -40C to +70C for the UC2906 and 0C to +70C for the UC3906, +VIN = 10V, TA = TJ.
PARAMETER Voltage Amplifier Input Bias Current Maximum Output Current Open Loop Gain Output Voltage Swing Driver Minimum Supply to Source Differential Maximum Output Current Saturation Voltage Current Limit Amplifier Input Bias Current Threshold Voltage Threshold Supply Sensitivity Voltage Sense Comparator Threshold Voltage Input Bias Current Current Sense Comparator Input Bias Current Input Offset Current Input Offset Voltage Offset Supply Sensitivity Maximum Output Current Output Saturation Voltage Enable Comparator Threshold Voltage Input Bias Current Trickle Bias Maximum Output Current Trickle Bias Maximum Output Voltage Trickle Bias Reverse Hold-Off Voltage Over-Charge Terminate Input Threshold Voltage Internal Pull-Up Current Maximum Output Current Saturation Voltage Leakage Current At Threshold VOUT = 2V IOUT = 1.6mA IOUT = 50A VOUT = 40V 2.5 Open Collector Outputs (Pins 7, 9, and 10) 5 0.25 0.03 1 0.45 0.05 3 2.5 5 0.25 0.03 1 0.45 0.05 3 mA V V A 0.7 1.0 10 1.3 0.7 1.0 10 1.3 V A VOUT = +VIN - 3V Volts below +VIN, IOUT = 10mA +VIN = 0V, IOUT = -10A 6.3 As a function of VREF 0.99 -0.5 25 1.0 -0.2 40 2.0 7.0 2.6 6.3 1.01 0.99 -0.5 25 1.0 -0.2 40 2.0 7.0 2.6 1.01 V/V A mA V V Referenced to Pin 2, IOUT = 1mA +VIN = 5 to 40V VOUT = 2V IOUT = 10mA 25 20 0.1 0.01 25 0.05 0.05 40 0.2 0.45 0.5 0.2 30 0.35 0.35 25 20 0.1 0.01 25 0.05 0.05 40 0.2 0.45 0.5 0.2 30 0.35 0.35 A A mV %/V %/V mA V As a function of VREF, L1 = RESET As a function of VREF, L1 = SET Total Input Bias at Thresholds 0.94 0.895 -0.5 0.949 0.90 -0.2 0.960 0.910 0.94 0.895 -0.5 0.949 0.90 -0.2 0.960 0.910 V/V V/V A Offset below +VIN +VIN = 5 to 40V 225 0.2 250 0.03 1.0 275 0.25 225 0.2 250 0.03 1.0 275 0.25 A mV %/V Pin 16 = +VIN, IO = 10mA Pin 16 to Pin 15 = 2V 25 2.0 40 0.2 0.45 2.2 25 2.0 40 0.2 0.45 2.2 V mA V Total Input Bias at Regulating Level Source Sink Driver current = 1mA Volts above GND or below +VIN -0.5 -45 30 50 -0.2 -30 60 65 0.2 -15 90 -0.5 -45 30 50 -0.2 -30 60 65 0.2 -15 90 A A A dB V TEST CONDITIONS MIN UC2906 TYP MAX MIN UC3906 TYP MAX UNITS
Offset Common Mode Sensitivity CMV = 2V to +VIN
Note 3. The reference voltage will change as a function of power dissipation on the die according to the temperature coefficient of the reference and the thermal resistance, junction-to-ambient.
3
UC2906 UC3906 OPERATION AND APPLICATION INFORMATION
the charger a low current turn on mode. The output current of the charger is limited to a low-level until the battery reaches a specified voltage, preventing a high current charging if a battery cell is shorted. Figure 2 shows the state diagram of the charger. Upon turn on the UV sense circuitry puts the charger in state 1, the high rate bulk-charge state. In this state, once the enable threshold has been exceeded, the charger will supply a peak current that is determined by the 250mV offset in the C/L amplifier and the sensing resistor RS. To guarantee full re-charge of the battery, the charger's voltage loop has an elevated regulating level, VOC, during state 1 and state 2. When the battery voltage reaches 95% of VOC, the charger enters the over-charge state, state 2. The charger stays in this state until the OVER-CHARGE TERMINATE pin goes high. In Figure 1, the charger uses the current sense amplifier to generate this signal by sensing when the charge current has tapered to a specified level, IOCT. Alternatively the over-charge could have been controlled by an external source, such as a timer, by using the OVER-CHARGE INDICATE signal at Pin 9. If a load is applied to the battery and begins to discharge it, the charger will contribute its full output to the load. If the battery drops 10% below the float level, the charger will reset itself to state 1. When the load is removed a full charge cycle will follow. A graphical representation of a charge, and discharge, cycle of the dual lever float charger is shown in Figure 3.
Internal reference temperature characteristic and tolerance.
Dual Level Float Charger Operations The UC2906 is shown configured as a dual level float charger in Figure 1. All high currents are handled by the external PNP pass transistor with the driver supplying base drive to this device. This scheme uses the TRICKLE BIAS output and the charge enable comparator to give
Figure 1. The UC2906 in a dual level float charger.
4
OPERATION AND APPLICATION INFORMATION (cont.)
Design Procedure
1) Pick divider current, ID. Recommended value is 50 A to 100 A. 2) 3) 4) 5) RC = 2 .3V / ID RA + RB = RSUM = (VF - 2 .3V ) / ID RD = 2 .3V * RSUM / (VOC - VF ) WHERE : RX = RC * RD / (RC + RD ) RB = RSUM - RA RS = 0.25V / IMAX RT = (VIN - VT - 2 .5V ) / IT IOCT = IMAX 10 RA = (RSUM + RX )(1- 2 .3V / VT )
UC2906 UC3906
6) 7) 8) 9)
Note: V12 = 0.95VOC , . V 31 = 0.90VF , For further design and application information see UICC Application Note U-104
Figure 2. State diagram and design equations for the dual level float charger.
Explanation: Dual Level Float Charger
A. B. C. D. Input power turns on, battery charges at trickle current E. rate. Battery voltage reaches VT enabling the driver and turning off the trickle bias output, battery charges at lMAX F. rate. Transition voltage V12 is reached and the charger indiG. cates that it is now in the over-charge state, state 2. Battery voltage approaches the over-charge level VOC and the charge current begins to taper. Charge current tapers to lOCT. The current sense amplifier output, in this case tied to the OC TERMINATE input, goes high. The charger changes to the float state and holds the battery voltage at VF. Here a load (>lMAX) begins to discharge the battery. The load discharges the battery such that the battery voltage falls below V31. The charger is now in state 1, again.
Figure 3. Typical charge cycle: UC2906 dual level float charger. 5
UC2906 UC3906 OPERATION AND APPLICATION INFORMATION (cont.)
Compensated Reference Matches Battery Requirements When the charger is in the float state, the battery will be maintained at a precise float voltage, VF. The accuracy of this float state will maximize the standby life of the battery while the bulk-charge and over-charge states guarantee rapid and full re-charge. All of the voltage thresholds on the UC2906 are derived from the internal reference. This reference has a temperature coefficient that tracks the temperature characteristic of the optimum-charge and hold levels for sealed lead-acid cells. This further guarantees that proper charging occurs, even at temperature extremes. Dual Step Current Charger Operation Figures 4, 5 and 6 illustrate the UC2906's use in a different charging scheme. The dual step current charger is useful when a large string of series cells must be charged. The holding-charge state maintains a slightly elevated voltage across the batteries with the holding current, 1H. This will tend to guarantee equal charge distribution between the cells. The bulk-charge state is similar to that of the float charger with the exception that when V12 is reached, no over-charge state occurs since Pin 8 is tied high at all times. The current sense amplifier is used to regulate the holding current. In some applications a series resistor, or external buffering transistor, may be required at the current sense output to prevent excessive power dissipation on the UC2906. A PNP Pass Device Reduces Minimum Input to Output Differential The configuration of the driver on the UC2906 allows a good bit of flexibility when interfacing to an external pass transistor. The two chargers shown in Figures 1 and 4 both use PNP pass devices, although an NPN device driven from the source output of the UC2906 driver can also be used. In situations where the charger must operate with low input to output differentials the PNP pass device should be configured as shown in Figure 4. The PNP can be operated in a saturated mode with only the series diode and sense resistor adding to the minimum differential. The series diode, D1, in many applications, can be eliminated. This diode prevents any discharging of the battery, except through the sensing divider, when the charger is attached to the battery with no input supply voltage. If discharging under this condition must be kept to an absolute minimum, the sense divider can be referenced to the POWER INDICATE pin, Pin 7, instead of ground. In this manner the open collector off state of Pin 7 will prevent the divider resistors from discharging the battery when the input supply is removed.
Figure 4. The UC2906 in a dual step current charger.
6
UC2906 UC3906 OPERATION AND APPLICATION INFORMATION (cont.)
Figure 5. State Diagram and design equations for the dual step current charger.
Explanation: Dual Step Current Charger
A. B. Input power turns on, battery charges at a rate of IH + IMAX. Battery voltage reaches V12 and the voltage loop switches to the lower level VF. The battery is now fed with the holding current IH. C. An external load starts to discharge the battery. D: When VF is reached the charger will supply the full current IMAX + IH. E. The discharge continues and the battery voltage reaches V21 causing the charger to switch back to state 1.
Figure 6. Typical charge cycle: UC2906 dual step current charger
7
PACKAGE OPTION ADDENDUM
www.ti.com
8-Mar-2005
PACKAGING INFORMATION
Orderable Device UC2906DW UC2906DWTR UC2906N UC2906Q UC2906QTR UC3906DW UC3906DWTR UC3906J UC3906N UC3906Q UC3906QTR
(1)
Status (1) ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE ACTIVE OBSOLETE ACTIVE ACTIVE ACTIVE
Package Type SOIC SOIC PDIP PLCC PLCC SOIC SOIC CDIP PDIP PLCC PLCC
Package Drawing DW DW N FN FN DW DW J N FN FN
Pins Package Eco Plan (2) Qty 16 16 16 20 20 16 16 16 16 20 20 25 49 1000 40 2000 25 46 1000 40 2000 None None None None None None None None None None None
Lead/Ball Finish CU NIPDAU CU NIPDAU CU NIPDAU CU SNPB Call TI CU NIPDAU CU NIPDAU Call TI CU NIPDAU CU SNPB CU SNPB
MSL Peak Temp (3) Level-2-220C-1 YEAR Level-2-220C-1 YEAR Level-NA-NA-NA Level-2-220C-1 YEAR Call TI Level-2-220C-1 YEAR Level-2-220C-1 YEAR Call TI Level-NA-NA-NA Level-2-220C-1 YEAR Level-2-220C-1 YEAR
The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. None: Not yet available Lead (Pb-Free). Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens, including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
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