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SS6782G
Charge Controller for Dual Batteries
FEATURES
Quick and easy testing for production. Sequential charging control of two NiMH/NiCd Battery Packs. Reliable sequential fast charge control of dual NiMH and/or NiCd Battery Packs, even with a fluctuating charging current. Fast charge termination by: Tt, -V, 0V, safety timer, maximum temperature, or maximum voltage. Linearly adjustable safety timer and Tt detection slope line. Selectable battery voltage protection range. Selectable battery temperature protection mode. Protection against battery voltage and battery temperature faults. Selectable LED display mode for battery status. Five pulsed trickle charge modes. Discharge-before-charge function available to eliminate memory effect. Choice of 20-pin DIP or 20-pin SOP packages.
DESCRIPTION
The SS6782G fast-charge controller is designed for intelligent sequential charging of dual NiMH and NiCd batteries without the risk of malfunction. After powering on, the SS6782G charging sequence gives priority to battery pack A, represented by input signals at the ATS and ABV pins, over battery pack B, represented by BTS and BBV pin signals. The SS6782G automatically switches to charging the standby battery pack after the battery pack being charged finishes charging or encounters a fault condition. - V (-0.25%) detection, 0V (peak voltage timer) detection, and Tt detection are the primary methods employed by the SS6782G to terminate fast charge. The fast charge can also be cut off by maximum battery voltage and maximum battery temperature detection along with the safety timer to prevent charging under fault conditions of the charging system or the battery itself. Both Tt and -V detection methods have been proved powerful in terminating fast charging for NiMH and NiCd batteries. The SS6782G utilizes the combination of these two methods to make a reliable decision for ending fast charge and to avoid issues caused by using -V detection alone under certain conditions. Fig. 1 shows an
80
APPLICATIONS
Dual-Battery Fast Chargers for: Mobile Phones. Notebook and Laptop Personal Computers. Portable Power Tools and Toys. Portable Communication Equipments. Portable Video & Stereo Equipments.
1.55 100
Charge Current = 600mA Cell Capacity = 550mA NiMH Battery
Cell Voltage (V)
1.45
Temperature (C)
example of a charging curve of a battery charged by a fluctuating current from a NiMH battery charger which uses the SS6782G controller IC to achieve optimal charging. The Tt or -V detection circuitry may be disabled independently for different applications, such as system-integrated chargers, chargers with varying charge current, or battery packs lacking a temperature-sensing thermistor.
Cell Voltage
1.35 60
1.25
40
Temperature
1.15 0 10 20 30 40 50 60 20
Charge Time (min.)
Fig. 1
Battery charging characteristics from an SS6782G-controlled charger with a fluctuating charging current.
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The safety timer period, the mode of battery temperature protection, battery voltage protection range, the pulsed trickle charge duty cycle, and the LED display mode are all adjustable or selectable. A discharge-before-charge function is included to reduce the memory effect of NiCd batteries without the risk of overdischarging. A test mode is provided for charger manufacturers to dramatically reduce the production test time.
TYPICAL APPLICATION CIRCUIT
R1 R2 + R27 4.7K R28 R34 1K A1012 Q6 R29 R30 150 220 L1 200H + D1 1N5821 RS 0.1/2W C11 220F 4.7K D6 1N4148 R6 R7 + 1N5820 A1012 D4 Q2 R22 470 R23 330 VCC(5V) R21 2.7K Q1 D468 R5 20/5W R32 680 4 THERMISTOR BATTERY B B2 R10 B C5 0.1F R11 + C6 100F VCC(5V) 5 C7 0.1F R13 R12 6 7 R14 8 100K THERMISTOR BATTERY A B1 VCC(5V) R16 9 ATS R15 R17 10 LEA1 680 ICOA LEA2 1N5820 D5 R37 3.9K R35 1.5K Q7 D468 R3 100K C1 4.7F C2 0.1F
D7
R8 100K C3 4.7F R4 390 C4 0.1F VCC 5V
1 ABV DSW ICOB 2
20 SW1 19 R20 680 LED4
1N4148
VIN
LED5 + 2.2F C12
D8 1N4148 1M R36 3
BBV
LEB2 18
SS6782G DIS LEB1 17 R19 680 LED3
DC DE CF C10 1nF
BOOST
IS VCC +
VCC(5V) VIN 78L05 C9 100F R33 47K D2 1N4148
Q3 3904
GND 16 BTS VCC SEL1 15 14
GND
FB
SS6563G R25 1N4148 D3 470
A1012 Q4
ADJ SEL3 TMR
SEL2
R26 330
VCC(5V) R24 2.7K
13 MODE 12 11 R18 LED2 680
Q5 3904
A
C8 0.1F
LED1
Battery charger for Dual NiMH and NiCd Batteries
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ORDERING INFORMATION
SS6782GXXX
PIN CONFIGURATION
Packing options TR: tape and reel (not for PDIP) TB: tube (only option for PDIP) Package type GN: RoHS-compliant PDIP-20 GS: RoHS-compliant SO-20
PIN CONFIGURATION
TOP VIEW
ABV BBV
1
2
20 DSW 19 ICOB 18 LEB2 17 LEB1
16 GND 15 SEL1 14 SEL2
DIS 3 BTS VCC ADJ 4
5
6
SEL3 7
Example: SS6782GSTR in RoHS-compliant SO-20, shipped on tape and reel
TMR 8
13 MODE
12 ICOA
ATS
9
LEA1 10
11 LEA2
ABSOLUTE MAXIMUM RATINGS
Supply voltage
DC voltage applied on any pin
Sink current of ICOA pin, LEA1 and LEA2 pins
Sink current of ICOB pin, LEB1 and LEB2 pins
Operating temperature range
Maximum junction temperature
Storage temperature range
5.5V
5.5V
20mA
20mA
-40C ~ +85C
125C
-65C~ 150C
Lead temperature (soldering 10 sec.) ......................................................... 260C Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
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TEST CIRCUIT
Voltage Source
-
+
ABV BBV R1 560 DIS
DSW ICOB LEB2 R3 560 R4 560 GREEN ORANGE
Voltage Source
-
+
YELLOW
-
+
BTS VCC ADJ SEL3
LEB1 GND
R5 560
RED
Voltage Source VCC (5V) VCC V1 (0.95V) V2 (3V) 100K R2
SS6782G
SEL1 SEL2 MODE ICOA LEA2
VCC VCC VCC
TMR ATS LEA1
-
+
R8 560 R7 560
ORANGE
Voltage Source RED VCC R6 560
GREEN
ELECTRICAL CHARACTERISTICS
(TA=25C, VCC=5V, unless otherwise specified) (Note1)
PARAMETER Supply Voltage Supply Current Battery Low Before Initial Timer After Initial Timer (SEL3>3V) Voltage Protection Limit (SEL3<2V) Battery High (SEL3>3V) (SEL3<2V) Temperature Sense Limit Temperature High Temperature Low VATS VBTS TEST CONDITIONS SYMBOL VCC ICC MIN. 4.5 TYP. 5 1.1 MAX. 5.5 UNIT V mA
0.11 VABV VBBV 0.63 1.1 2.6 1.9 1.35 3.5
0.16 0.69 1.2 2.7 2.0 1.45 3.6
0.21 0.75 1.3 2.8 2.1 1.55 3.7 V V
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ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER Output Impedance of DIS pin LEA1, LEA2, LEB1, LEB2, ICOA, ICOB pins ON OFF Source Current Capability SEL3 pin DSW pin MODE, SEL1, SEL2 pins Input Impedance ABV, BBV, ATS, BTS, ADJ pins RTMR 1 2 100 1000 ISEL3 IDSW 1 5.5 16 25 50 M A A TEST CONDITIONS SYMBOL ZDIS MIN. TYP. 140 MAX. 250 UNIT
Output Impedance
300
k M k
Recommended External Resistor on TMR pin -V detection level relative to peak value
-0.25
%
Note 1: Specifications are production-tested at TA=25C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC).
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TYPICAL PERFORMANCE CHARACTERISTICS
(TA=25C, R2=100k , VCC=5V, refer to the test circuit, page 4)
1.18 81.0
Supply Current (mA)
1.12
Safety Timer (min.)
80.5
80.0
1.06
79.5
1.00 79.0 4.4 4.6 4.8 5.0 5.2 5.4 4.4 4.6 4.8 5.0 5.2 5.4
Fig. 2
VCC (V) Supply Current vs. Supply Voltage
VCC (V) Fig. 3 Safety Timer vs. Supply Voltage
82.0
1.26
Safety Timer (min.)
Supply Current (mA)
81.0
1.14
1.02
80.0
0.90
79.0
0
20
40
60
80
0
20
Fig. 4
Temperature(C) Safety Timer vs. Temperature
Temperature (C)
40
60
80
Fig. 5
Supply Current vs. Temperature
2.74
2.03
2.02
ABV, BBV (V)
2.70
ABV, BBV (V)
0 20 40 60 80
2.00
2.66
2.62
1.98
0
20
40
60
80
Fig. 6
Temperature (C) ABV and BBV (High) Limit vs. Temperature (SEL3>3V)
Fig. 7
Temperature (C) ABV and BBV (High) Limit vs. Temperature (SEL3<2V)
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TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
0.163
29
Output Impedance()
0 20 40 60 80
0.162
ABV, BBV (V)
27
0.160
25
0.158
23 0 20 40 60 80
Fig. 8
Temperature (C) ABV and BBV (Low) Limit vs. Temperature (Before Initial Timer)
Fig. 9
Temperature(C) Output Impedance vs. Temperature (LEA's, LEB's, ICO's pins)
0.710
1.22 0.705
ABV, BBV (V)
1.21
1.20
1.19
0
20
40
60
80
ABV, BBV (V)
0.700
0.695
0.690
0
20
40
60
80
Fig. 10
Temperature (C) ABV and BBV (Low) limits vs. Temperature (SEL3<2V, After Initial Timer)
Fig. 11
Temperature (C) ABV and BBV (Low) limits vs. Temperature (SEL3>3V, After Initial Timer)
1.48 3.62
ATS, BTS (V)
20 40 60 80
ATS, BTS (V)
3.61
1.46
3.60
1.44
3.59
3.58
0
1.42 0 20 40 60 80
Fig. 12
Temperature (C) ATS and BTS (High) Limit vs. Temperature
Fig. 13
Temperature (C) ATS and BTS (Low) Limit vs. Temperature
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BLOCK DIAGRAM
GND VCC TMR LEB2 LEB1 LEA2
MODE
MODE Selection
Bandgap Reference & Voltage Regulator
Oscillator Timing Control Unit Display Control Unit
LEA1
SEL3
Battery Voltage & Temperature Protection Setting LED Display& Trickle Charge Duty Setting
ICOB
SEL1 SEL2
Charge Control State Machine
Charge Control Unit
ICOA
ADJ
T/t Detection Setting Battery Temperature Protection 13-bit A/D Battery Voltage Protection + Discharge Control Unit
DIS DSW
CHARGE END
ATS
BTS
ABV
BBV
PIN DESCRIPTIONS
PIN 1: ABV - Battery voltage input to sense the voltage of battery pack A. PIN 5: VCC - Power supply 5V10%. input at
PIN 6: ADJ PIN 2: BBV - Battery voltage input to sense the voltage of battery pack B.
PIN 3: DIS
- Push-pull output, used to control an external transistor to discharge the battery pack B. DIS is active high when the discharge function is enabled.
- For adjusting the slope of T/t. Acceptable voltage range for this pin is approximately 0.28V to 3.8V. If the voltage is higher than (VCC - 0.3V), then T/ t detection is disabled.
PIN 7: SEL3
PIN 4: BTS - The battery cell temperature of pack B is represented as a voltage input to the SS6782G on this pin. The acceptable voltage range of the BTS pin is 0.29Vcc to 0.72Vcc.
- Determines the acceptable voltage range of ABV and BBV pins and the mode of the temperature protection function. - Determines the period of the safety timer with an external resistor connected to GND.
PIN 8: TMR
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PIN 9: ATS - The battery cell temperature of pack A is represented as a voltage input to the SS6782G on this pin. The acceptable voltage range of the ATS pin is 0.29Vcc to 0.72Vcc. PIN 14: SEL2 - Tri-level inputs, which jointly control the LED display mode and the duty of trickle charge after the completion of fast charge. - The same as pin 14. - Power ground. - Open-drain outputs used to indicate the charging status of battery pack B - The same as pin 17. - Open-drain output, used to control the charging current of the battery pack B. - Controls the function of discharge-before-charge of the battery pack B. (See discharge-before-charge subsection in the application information section).
PIN 15: SEL1 PIN 10: LEA1 - Open-draind outputs used to indicate the charging status of the battery pack A. - The same as pin 10. - Open-drain output, used to control the charging current of the battery pack A. PIN 16: GND PIN 17: LEB1
PIN 11: LEA2 PIN 12: ICOA
PIN 18: LEB2 PIN 19: ICOB
PIN 13: MODE - Determines the operating mode of the SS6782G. PIN 20: DSW
APPLICATION INFORMATION
OPERATION
Power-on and Battery Pre-qualification The SS6782G is a sequential charger, initiating charging on either battery pack A or B. When power is first applied to the SS6782G, all internal digital circuits of the SS6782G are reset by the internal power-on-reset circuitry, and the output of LED`s (depending on the setting of SEL1 and SEL2 pins) flash 3 times to indicate the initiation of power-on. If both battery pack A and B are present when V CC is applied to the SS6782G, the charging action begins with battery pack A if conditions are acceptable. The condition of battery pack A is examined through the ATS and ABV pins, while battery pack B is examined through the BTS and BBV pins. The acceptable limits of ABV and BBV are determined by the input voltage of SEL3 pin and the acceptable temperature sense voltage window for ATS and BTS of 0.29Vcc to 0.72Vcc. The SS6782G controls initiation of the charging action and checks for acceptable battery voltage and temperature prior to fast charging. If the voltage of ABV or BBV does not fall within the predetermined acceptable limits, the corresponding battery pack enters a chargingsuspended mode. If the voltage of ATS or BTS is outside the 0.29VCC to 0.72VCC window, the
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action to be taken is determined by the input voltage of SEL3 pin. Discharge-Before-Charge The SS6782G provides the function of dischargebefore-charge to precondition NiCd batteries, which can suffer from a memory effect. This function can only be activated for pack B after the prequalification of battery voltage and temperature, but before the charge completion is registered for a fast charge cycle of pack B. To trigger this function, DSW pin has to be biased to GND over 0.18 second. After discharge begins, LEB1 and LEB2 pins are both OFF, ICOB pin is ON, and DIS pin goes high to activate an external circuit to discharge the battery pack B until the voltage of BBV pin fall below 0.9V (or 0.69V, depending on the input voltage of SEL3 pin) or DSW pin is biased to GND for over 0.18 second again. The application circuit is included in the TYPICAL APPLICATION CIRCUIT shown on page 2. Fast Charge After the battery passes fault checks, charging begins on either of the batteries, and the other battery remains in a waiting state until the first battery terminates fast charging. The SS6782G automatically switches to fast charge the second battery. The battery pack A has the priority over battery pack B only when power is first applied to the SS6782G. When fast charging begins, the initial and safety timer of the SS6782G start counting. The -V detection, peak voltage timer, T / t detection, and maximum battery voltage functions are, however, disabled temporarily until the initial timer period in the initial stage of the charging cycle elapses. The initial timer period is equal to 1/80 of safety timer. Since the low limit of acceptable ABV or BBV voltages are only about 0.16V during the initial In the course of fast charge, the SS6782G constantly monitors the battery voltage and temperature through ABV (or BBV) and ATS (or BTS) pins. The fast charge process is registered complete when any one of the following situations is encountered, which are explained below: Negative delta voltage (-V). Peak voltage timer ( 0 V ). Delta temperature/ delta time ( T / t ). Maximum charge time. Maximum battery voltage. Maximum battery temperature. - V Cutoff The SS6782G makes a voltage sampling at ABV (or BBV) pin every 4 seconds when the safety timer period is set equal to 80 minutes. If a negative delta voltage of 0.25% compared to its peak value is detected at ABV (or BBV) pin, the fast charge cycle is terminated. 0 V Cutoff If the battery voltage stays at its peak value or decreases very slowly for the duration determined by the peak voltage timer, which is in turn equal to 3.7% of the safety timer, the fast charging action is terminated. timer period, even deeply discharged batteries can easily qualify to be fast charged subsequently.
T/ t Cutoff
The T / t detection of the SS6782G is performed by sensing the decrease of ATS (or BTS) pin voltage in a specific timer interval dictated by the safety timer. The fast charging terminates when the decrease of ATS (or BTS) pin voltage in 56 seconds exceeds the predetermined value set by ADJ pin input. This time interval of 56 seconds is based on the assumption that the voltage of ATS (or BTS) pin is sampled
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once every 8 seconds, which is also determined by the safety timer. The -V detection and peak voltage timer (0 V) functions can be disabled if the MODE pin is biased to GND. The T/ t function can be disabled if the voltage of the ADJ pin is higher than (Vcc-0.3V). Maximum Safety Timer Cutoff The maximum fast charge period is determined by the safety timer, which is set by a resistor connected from TMR pin to GND. Safety timer, -V sampling rate, and T / t sampling rate will be longer if the resistor value is larger. When the value of the resistor is 100k, the safety timer period equals 80 minutes. This can be verified by biasing the MODE pin to VCC and the measured frequency on DSW pin should be around 32.8 KHz. After the safety timer period is finished, the fast charge action is terminated. Maximum Voltage and Temperature Cutoff The SS6782G guards against the maximum limits for battery voltage and temperature during fast charging. If either of these limits is exceeded, fast charge action is terminated. Trickle Charge There are five different selectable duty cycles for trickle charging after fast charging to prevent the loss of charge due to battery selfdischarging. The setting of SEL1 and SEL2 pins controls the duty cycle. This function can only be activated in the following three situations: Battery pack A is fully charged and battery pack B is abnormal. Battery pack B is fully charged and battery pack A is abnormal. Battery pack A and B are both fully charged.
DESIGN GUIDE
ABV/BBV Range and Temperature Protection The acceptable battery voltage range of ABV and BBV pins and the mode of temperature protection function is determined by the voltage of the SEL3 pin, shown as the following: (a) SEL3 > VCC - 0.3V Acceptable ABV/BBV Range: Before initial timer: 0.16V~2.7V After initial timer: 0.69V~2.7V Temperature Protection Mode: Enters charging-suspended mode when temperature is either too low or too high, same as abnormal battery voltage. Latch for chargesuspending function is provided for high temperature protection, but not for low temperature protection. (b) VCC - 1.4V> SEL3 >
V cc - 0.4V 2
Acceptable ABV/BBV Range: Before initial timer: 0.16V~2.7V After initial timer: 0.69V~2.7V Temperature Protection Mode: If temperature is too high, battery charging is regarded as completed. If temperature is too low, function of T / t detection is disabled, just as if the thermistor did not exist. (c)
V cc - 0.4V>SEL3 >1.4V 2
Acceptable ABV/BBV Range: Before initial timer: 0.16V~2 V After initial timer: 1.2V~2V Temperature Protection Mode: Enters the charging-suspended mode when temperature is too low or too high, same as abnormal battery voltage. Latch for charging-suspended function is provided for high temperature protection, but not for low temperature protection.
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(d) 0.3V> SEL3 Acceptable ABV/BBV Range: Before initial timer: 0.16V~2 V After initial timer:1.2V~2V Temperature Protection Mode: If temperature is too high, battery charging is regarded as complete. If temperature is too low, the t/ t detection function is disabled, just as if the thermistor did not exist. Battery Voltage Measurement The SS6782G measures the battery voltage through ABV and BBV pins, which are connected to the battery positive terminals through a resistordivider network, as shown in Fig. 14. The acceptable limit of divided battery voltage is determined by the input voltage of SEL3 pin. TABLE 1 BATTERY CELLS 2~4 3~6 4~8 5~10 6~12 8~16 RA/RB 2 3.3 4.9 6.4 7.8 10.8 RA k 240 300 300 300 310 390 RB k 120 91 62 47 39 36
For SEL3 < ((VCC/2) -0.4V), the suggested divider resistances of RA and RB for the corresponding number of battery cells are shown below: TABLE 2 BATTERY CELLS 2 3 4 5 RA/RB 1 2 3 4 5 7 9 11 15 RA (k ) 240 240 240 300 300 360 360 390 410 RB (k ) 240 120 80 75 60 51 40 36 27
VBAT
RA R6 + C5 100K 4.7F C6 0.1F ABV/BBV SS6782G
6 8 10 12 16
RB
Fig. 14 Battery Voltage Divider For SEL3 > ((VCC/2) + 0.4V), the suggested divider resistances of RA and RB for the corresponding number of battery cells are as below: Battery Temperature Measurement The SS6782G employs a negative temperature coefficient (NTC) thermistor to measure the bat' tery s temperature. The thermistor is inherently nonlinear with respect to temperature. To reduce the effect of nonlinearity, a resistor-divider network in parallel with the thermistor is recommended. A typical application circuit is shown in Fig. 15.
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VCC VBAT Rx 5 VCC ATS/BTS C7 0.1F
Thermistor
Ry//RTH x Vcc Rx + (Ry// RTL) RTL= The resistance of thermistor at lower limit of temperature protection. 0.72 Vcc =
SS6782G
Ry 16 GND
Fig. 15 Battery Temperature Sense Circuit with a Negative Temperature-Coefficient (NTC) Thermistor The calculation for Rx and Ry in the circuit is as follows: Ry / /RTH 0.29 Vcc = x Vcc Rx + (Ry / / RTH) RTH= The resistance of thermistor at upper limit of temperature protection.
Substitution and rearranging the equations yields RTL x RTH Rx= 2.061 x RTL - RTH 5.3 x RTL x RTH Ry = RTL - 6.3RTH If the temperature characteristic of the thermistor is like that of the SEMITEC 103AT-2, the resistance of Rx and Ry is tabulated below for different values of TL and TH: (note: TL is the lower temperature limit and TH is the upper temperature limit.)
TABLE 3 Values of Rx and Ry at TL = 0C TH (C) 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 Rx(k) 10.1 9.7 9.4 9.0 8.7 8.4 8.1 7.8 7.5 7.2 7.0 6.8 6.5 6.3 6.1 5.9 5.7 5.5 5.3 5.2 5.0 Ry (k) 551.1 300.7 204.8 153.9 122.8 101.8 86.5 75.0 66.0 58.7 52.8 47.8 43.6 39.9 36.8 34.0 31.6 29.5 27.5 25.8 24.3
TABLE 4 Values of Rx and Ry at TL = -10C TH (C) 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Rx (k) 11.4 11.0 10.6 10.2 9.8 9.5 9.1 8.8 8.5 8.2 7.9 7.6 7.4 7.1 6.9 6.7 6.4 6.2 6.0 5.8 5.6 Ry (k) 95.6 85.0 76.2 68.9 62.8 57.5 52.9 48.8 45.3 42.1 39.4 36.8 34.6 32.5 30.7 29.0 27.4 26.0 24.6 23.4 22.2
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Setting the ADJ Pin Voltage The slope of T / t detection is determined by the ADJ pin voltage of the SS6782G. The calculation of ADJ pin voltage is shown in the following procedure followed by an example. Procedure TABLE 5 ADJ Pin Voltage (TL=0C, TH=50C) (a) First, determine the temperature protection limits TH and TL. Then, substitute TH & TL into the following equation: V TS 0.72V CC - 0.29V CC 0.43V CC = = TBASE TH - TL TH - TL T / t S.T. 40 min. (2C) 80 min. (1C) 120 min. (0.67C) (b) Determine the safety timer to obtain the value of tBASE . 56(sec.) tBASE(sec.) = x Safety Timer (min .) 80(min .) (c) Determine the expected slope of T / t at which temperature rises yC in x seconds and fast charge is subsequently cut off. T y = t x (d) Calculate the value of VADJ T V TS V ADJ = 25 x x x t BASE TBASE t 160 min. (0.5C) 200 min. (0.4C) 240 min. (0.33C) 0.75 1.0 1.25 (C/min.) (C/min.) (C/min.) 0.37 0.5 0.63 0.75 1.12 1.5 1.87 2.25 1.0 1.5 2.0 2.5 3.0 1.25 1.87 2.5 3.12 3.75
T / t = 1 = 0. 0166 60
(d) VADJ =25 x 0.043 x 0.0166 x 56 = 1(V) If the temperature range is from 0C to 50C, the voltage of VADJ under different setting conditions should be set as tabulated below.
A similar table for temperature range from 0C to 60C is shown below. TABLE 6 ADJ Pin Voltage (TL=0C, TH=60C) T / t S.T. 40 min. (2C) 80 min. (1C) 120 min. (0.67C) 160 min. (0.5C) 200 min. (0.4C) 0.75 1.0 1.25 (C/min.) (C/min.) (C/min.) 0.31 0.62 0.94 1.25 1.56 1.87 0.42 0.84 1.25 1.67 2.08 2.5 0.52 1.05 1.56 2.08 2.60 3.12
Example (a) Let TH=50C, TL=0C, VCC =5V. We have VTS 0.43 x 5 = = 0.043V/ C TBASE 50 - 0 which means that VTS decreases 43mV as temperature rises 1C. (b) If safety timer is equal to 80 minutes, tBASE is then 56 seconds. (c) If fast charging should be terminated when temperature rises 1C in 60 seconds, then
240 min. (0.33C)
Setting the Period of Safety Timer The SS6782G provides a method for linearly adjusting the period of safety timer with an external resistor connected from TMR pin to GND. The relation between safety timer length and the external resistor (RTMR) is shown in Fig. 16. The table following shows the resistor values.
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for some of the commonly chosen safety timer periods. Also shown in the table is their corresponding oscillator frequencies. TABLE 8 The Operating Mode of SS6782G
800
For relevant information, please contact SSC directly.
MODE pin VCC
Mode Test
Function Safety timer period scaled down to 1/32.... etc. - V detection disabled
600
RTMR (k)
400
Floating GND
Normal Normal operation AC
200
0 0 100 200 300 400 500
The LED Display and Trickle Charge Modes The SS6782G provides two LED display modes and five pulsed trickle charge modes. The modes of LED display and trickle charge are determined by the tri-level inputs, SEL1 and Osc.Freq. (kHz) 262.4 131.2 65.6 43.7 32.8 21.9 16.4 10.9 7.3 5.5 Safety timer (min.) 10 20 40 60 80 120 160 240 360 480 SEL2 pins, as in the TABLE 9. TABLE 9 Mode of LED Display and Trickle Charge SEL1 SEL2 VCC Floating GND VCC Floating GND VCC Floating GND Trickle Charge Duty N/A 1/32 1/64 1/128 1/256 N/A 1/32 1/64 1/128 LED Display Mode Type 1 Type 1 Type 1 Type 1 Type 1 Type 2 Type 2 Type 2 Type 2
Safety Timer (min.)
Fig. 16 Safety Timer vs RTMR TABLE 7 RTMR (k) 11 23 48 74 100 152 206 314 491 667
VCC
Floating
Selecting Mode of Operation The SS6782G provides three modes of operation: normal, test, and AC mode, determined by the setting of the MODE pin according to TABLE 8. The SS6782G will operate normally when the MODE pin is left floating (a 0.1F capacitor is recommended to be tied to the MODE pin if the charging circuit works in a noisy environment). When the MODE pin is biased to GND, the function of -V detection is disabled. When the MODE pin is biased to VCC, the SS6782G enters the test mode. The test mode can be used to significantly reduce production test time. GND
Displaying the Battery Charging Status The SS6782G provides four open-drain outputs, in which LEA1 and LEA2 are used to indicate the battery charging status of pack A, and LEB1 and LEB2 are used to indicate battery charging status of pack B. Refering to the table of LED display modes (TABLE 6), depending on the setting of SEL1 and SEL2 pins, the outputs of LEA1, LEA2, LEB1, and LEB2 pins are shown in the following table:
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SS6782G
TYPE 1 Power On LEA1/ LEB1 LEA2/ LEB2 TYPE 2 Power On LEA1/ LEB1 LEA2/ LEB2 1HZ 1HZ Wait 1HZ 1HZ Charge ON 4HZ Full OFF ON Abnormal 4HZ OFF 1HZ OFF Wait ON ON Charge ON OFF Full OFF ON Abnormal OFF OFF Test Mode Fig. 17 shows the timing diagram for externally controlled ADJ, ABV, BBV, ATS, BTS, SEL1 and SEL2 pin voltages in a recommended SS6782G test scheme, utilizing TEST mode function. Output waveforms of LEA1, LEA2, LEB1, LEB2, ICOA and ICOB from a properly functioning SS6782G are also shown in the figure. For detailed information please consult with SSC staff directly.
Charging Current Control As shown in the typical application circuit, the SS6782G offers two open-drain output pins, ICOA and ICOB pins, to control the charging current of battery pack A and pack B. When fast charging is completed, the SS6782G enters the trickle charge mode. In trickle charge mode, the ICOA or ICOB output pins switch with predetermined duty cycle. Refering to the table of trickle charge mode (TABLE 6), the duty cycle is determined by the setting of SEL1 and SEL2 pins. The following table summarizes how ICOA and ICOB pins correspond to various charging states.
Power Wait Fast Charge Fault ON ON Charging Completed Conditions ICOA/ ICOB ON ON OFF See pin 14 & 15 ON
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SS6782G
TIMING DIAGRAM
VCC, SEL3, MODE=5V, (DSW FREQ.=820KHz, 25 TIMES of 32.8K)
Power Init. PEAK TIMER TEST ON
ADJ
-V TEST
-V DISABLE TEST
T/t TEST
SAFETY TIMER TEST
5V
1.12V
3V
(-0.15%) 2V 1.95V
(A):ABV (B):BBV
<2.1V
2V (-0.15%) 1.997V 1.993V (-0.35%) 4V 2V 1.96V (-2.15%) 2V 1.997V 1.9V
2V
2mV Step/100mS
1.997V
1.5V
(A):ATS (B):BTS
4V 2V
4V
<2.1V 2V
1.85V (-2.5%) OFF ON 3.2KHz
ON
4V
2V
0V
2mV Step/100mS
OFF
(A):LEA1 (B):LEB1 (A):LEA2 (B):LEB2 (A):ICOA (B):ICOB
SEL1 SEL2 TIME (A) (SEC.) STAGE
0.1
OFF
OFF
ON OFF
ON ON
ON OFF
OFF
ON
OFF
ON
GND Floating
0.97 0.5 7 0.24
VCC Floating
0.14 0.12 1
Floating Floating
0.26 3
Floating GND
0.32 5
0.12 6 0.32
GND GND
0.4 8 1.32 9
Floating
Floating
0.74
0.12 4
0.32
0.1
0.02 10
2
0 0.14 0.26 TIME (B) (SEC.) STAGE
0.1
0.14 0.12 11
1
0.74 0.26 13
1.26 1.38
1.17
2.02 2.14
Delay 0.3 14
2.46
3.43
0.5 15
3.93 4.17
0.24 0.4 16
4.57
5.89
5.99
6.01
12
6.01
6.11 6.25 6.37
7.21 7.47
7.77
8.27 8.51
8.91
Fig. 17 Timing Diagram of SS6782G in Test Mode
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SS6782G
PHYSICAL DIMENSIONS (unit: mm)
DIP-20
D
S Y M B O L
DIP-20 MILLIMETERS MIN. MAX. 5.33 0.38 2.92 0.36 1.14 0.20 24.89 0.13 7.62 6.10 2.54 BSC 7.62 BSC 10.92 2.92 3.81 8.26 7.11 4.95 0.56 1.78 0.35 26.92
E1
A A1 A2 b b2 c
A2
D D1 E
A1
L
A
A
A
E1 e eA eB
D1 E
b2
e
GAUGE PLANE
L
b
0.38
eA eB
BASE METAL SECTION A-A
SOP-20 (300 mil)
D
S Y M B O L
c
WITH PLATING
SOP-20 MILLIMETERS MIN. 2.35 0.10 0.33 0.23 12.60 7.40 1.27 BSC 10.00 0.25 0.40 0 10.65 0.50 1.27 8 MAX. 2.65 0.30 0.51 0.32 13.00 7.60
H
E
A A1 B C
h x 45
e
A
A
D
SEE VIEW B
E e
A
H h
A1
L
B C
WITH PLATING
0.25
BASE METAL SECTION A-A GAUGE PLANE SEATING PLANE
L VIEW B
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SS6782G
Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of Silicon Standard Corporation or any third parties.
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