Features

*Quick charging and connection of two nickel -cadmium or nickel -hydride cadmium or nickel -metal hydraulic battery pack

*Host -delayed pulse switch mode current regulator or external adjustment The door control control of the device

*Easy to integrate, for example, rated as a system EMS or used as an independent charger

*The pre -charging mass under each charging and voltage

* The indicator output shows the hit and charge status

*Fast charging device

ΔTemp Era T URE/Δtime, -ΔV, MAX I Mum Volt Age, MAX I Mum Tem Per A Ture, and MAX I Mum Tem Per A Ture, and Max I Mum Time

*Fine stream of pulse from top to bottom

Pin connection generally explains

BQ2005 fast charging integrated circuit provides high -speed on single stone CMOS devices The fast charging control function of the switching power control circuit is used for follow -up charging management in the application of dual battery packs.

In the design of the closed -loop current control circuit, the BQ2005 will become the basis of an independent system with a high cost -effective and one or more unit battery system integrated circuit.

S W i T C H-A C T i V A T E D D. Discharge all OWS BQ2005 before charging the charger based on OWS BQ2005 to support battery adjustment and battery charging.

High -efficiency power conversion is the control rent that uses BQ2005 as a stagnation pulse width controller to the switching power supply. BQ was officially used to launch a final registered charging currency on May 3, 2005.

Quick charging can be the application of charging power supply, battery replacement or switching pressure. For safety reasons, before the battery temperature and voltage are within the specified range, fast charging is uninterrupted.

Temperature, voltage and time are monitored by fast charging. Quick charging is caused by any of the following situations:

- temperature rise rate (dt/dt)

- Negative triangle voltage ( -DV)

- Maximum voltage

-

Maximum temperature -

For the longest

123] After fast charging, the operation of the operation can be used to resonate with the pulse current owner.

Function description

Figure 3 shows a frame diagram, Figure 4 shows the status diagram of BQ2005.

Battery voltage and temperature measurement

Monitor the battery voltage and temperature to obtain the mostLarge allowable value. The battery induction input BATA, the voltage displayed on B must be between 0.95 #8727; VCC and 0.475 #8727; VCC to work normally. Resistance division voltage ratio:

It is recommended to keep the battery voltage within the effective range, where n is the number of batteries, RB1 is a resistor connected to the battery positive pole, RB2 is connected to connect To the resistor of the battery negative terminal. see picture 1.

Note: The input impedance of this resistor divide the network end -to -end end -to -end should be at least 200kΩ and less than 1MΩ.

The stranded reference negative temperature coefficient thermistor placed near the battery can be used as a low-cost temperature-voltage sensor. The temperature sensing voltage input at TSA, B is developed using the resistor heating resistance network between VCC and VSS. see picture 1. Both BATA, B and TSA, and B are referenced to SNSA and B, so the signals used inside the IC are:

and

Discharge before charging

DCMDA input used to output commands DischargebeFore Charge through DISA. Once activated, DISA will become activated (high) until VCell is lower than VEDV, where:

At this time, the DISA becomes lower and the new fast charging cycle begins.

DCMDA input is pulled inside to VCC (its non -activity status). Therefore, the non -connected input will cause discharge failure before charging. Regardless of the current status of BQ2005, the stagnation continuous pulse on DCMDA starts discharge at any time before charging. If DCMDA is connected to VSS, discharge before charging will be the first step in all new start -up charging cycles.

Start a large cycle

The new charging cycle begins (see Figure 2):

1. VCC rises to 4.5V

2, vCell Through the maximum battery voltage, VMCV, of which:

If DCMDA is at a low level, the discharge before charging will be performed as the first step of the new charging cycle. Otherwise, the identification test before charging will be the first step.

Before the fast charging starts, the battery must be within the range of the configuration temperature and voltage limit.

The effective battery voltage range is vedv lt; vbat lt; vmcv. The effective temperature range is vhtf lt; vtemp lt; vltf, where:

VTCO is the voltage of the TCO input terminal, which is used by the user on VCC and the VCC and theConfigure a resistor division between ground. The allowable range is 0.2 to 0.4*VCC.

If the battery temperature exceeds the range or the voltage is too low, the chip will enter the charging waiting state, waiting for both conditions to be within the allowable range. Modue MODA, B output to provide a trickle charging ratio configured in the charging state. There is no time limit for charging and waiting status; as long as the voltage or temperature conditions exceed the allowable limit, the charger will maintain this state. If the voltage is too high, the chip will enter a battery -free state, waiting for a new charging cycle to start.

Quick charging continues one or more of the five possible termination conditions:

Δ temperature/Δ time (∏t/∏t)

negative negative Triangular voltage (--V)

Maximum voltage

Maximum temperature

The longest

-v, terminate

If the DVEN input is high, the voltage of BQ2005 samples every 34s. If VCell is lower than any previously measured value of 12 mv ± 4 mv, the fast charging is terminated. In the range of VMCV- (0.2 #8727; VCC) lt; vcell lt; vmcv- #8727; V test is effective.

Voltage sampling

The average interval of each sample was measured by 16 microseconds for 16 times. The sampling cycle (18.18MS) is filtered by about 55Hz harmonic. This technology minimizes the impact of any AC line ripples. These ripples can be powered by the AC power supply from 50 Hz or 60 Hz on the power supply. The tolerance of all time is ± 16%.

Voltage terminal delay

The delay period occurred at the beginning of the fast charging. During the delay period, the -5 terminates for disable. This avoids the premature termination of the old battery when using a fast charging current for the first time. The maximum voltage and maximum temperature terminal are not affected by the stoppage period.

The termination of the electricity exchange is terminated

BQ2005 samples the voltage of the TS pin every 34s, and compares it with the previous two samples. If VTEMP drops 16mv ± 4mv or higher, it will terminate fast charging. Only when VTCO LT; VTEMP LT; VLTF, ∏T/∏t termination test is effective.

Temperature sampling

The average interval of each sample was measured by 16 microseconds for 16 times. The sampling cycle (18.18MS) is filtered by about 55Hz harmonic. This technology minimizes the impact of any AC line ripples. These ripples can be powered by the AC power supply from 50 Hz or 60 Hz on the power supply. All timeThe tolerance of the interception is ± 16%. The maximum voltage, temperature, and time are rising to VMCV above VMCV, and CHG immediately becomes high (LED is extinguished). If the BQ2005 is not in the voltage maintenance period, it will stop quickly. If Vcell falls below VMCV before TMCV 1S (maximum value), the chip is converted to the charging completion state (maximum voltage termination). If the VCell is kept above VMCV when the TMCV expires, the BQ2005 will be converted to a battery -free state (battery removal). See Figure 4.

When the voltage on the TS pins is lower than the temperature deadline threshold VTCO, the maximum temperature will end. After the fast charging starts, if the VTEMP increases to the minimum temperature fault threshold VLTF, the charging will also be terminated.

The maximum charging time is configured using the TM pin. Time settings can be used for the corresponding rates of C/4, C/2, 1C and 2C. The maximum timeout termination is forcibly executed during the fast charging phase, and then reset. If it is selected, the execution is forced again during the closing phase at the top. There is no time limit during the trick of charging.

The recharge fee

For C/2 to 4C rate, you can choose a optional recharge charging stage to follow the fast charging. This stage may be necessary, and there is a trend for nickel -metal hydride or other battery chemistry. Before the charging is terminated, it has achieved adequate capabilities. In the case of enabling TOP OFF, for a period of time when the TM1 and TM2 input pins are selected, the charging continues at a low rate after the fast charging termination. (See Table 2) During the filling process, the CC pin is prepared every 30 seconds in a 4S working cycle. The average rate generated by this modulation is one -eighth of the fast charging rate. Maximum voltage, time, and temperature are the only terminal method enabled during the closure.

pulse drip flow charging

Pulse trickle charging follow the fast charging and optional rechargeable phase to compensate the self -discharge of the battery when the charger is free. The configuration pulse drip rate is also applied to the charging waiting state to increase the voltage of overload batteries to the minimum value required before the start of fast charging.

In the pulse trickle mode, MOD activates 260 microseconds within the specified cycle of TM1 and TM2 settings. See Table 1. If TOP OFF is enabled, the trickling rate generated is C/64. If TOP OFF is disabled, C/32 is disabled. By connecting TM1 and TM2 to VSS, the pulse can be disabled and the top can be turned off.

Charging status indicator

The charging status is indicated by the CHG output. The CHG output status of each charging cycle stage is shown in Figure 4, as shown in Figure 2.

The temperature state is instructed by the temperature output. When VTEMP is in the temperature window defined by VLTF and VHTF temperature limit, TEMP is in a high state; when the battery temperatureWhen these limits are exceeded, TEMP is in a low state.

In all cases, if Vcell exceeds the voltage at the foot of the MCV tube, regardless of other conditions, CHG and TEMP output remain high. Both CHG and TEMP can be used to directly drive LEDs.

Packaging sorting

If both battery A and B exist when the new charging cycle starts, the charging cycle starts from the battery B, and B keeps the activation channel until the fast charging termination. Then, the battery A will be charged quickly, and then a top -down stage is performed on B (if selected), a top -down stage is performed on A (if selected), and then the two are maintained on the two. If there is only a battery A, the charging cycle starts from A to the fast charging termination, even if the battery is inserted into the channel B at the same time. When A is in the top and down phase, inserting a new battery in channel B will terminate the top to bottom on A and start a new charging cycle on B. If A is configured or ordered to discharge before charging, the discharge may occur when the channel B is the event charging channel. When the discharge is completed, if B is still activated, the battery will enter the charging state until B enter the activation channel.

Charging current control

BQ2005 controls the charging current through MODA and B output pins. The current control circuit design is used to support the implementation of the constant current switching voltage regulator or the grid source that is adjusted to the external adjustment.

When using in the switch mode configuration, the rated adjustment current is:

On the sensing resistor RSN between the low -voltage side and grounding of the battery pack, The voltage drop, monitor charging current at SNSA, B input terminal. The size of RSNS can provide the required fast charging current.

If SNSA, the voltage of B pins is smaller than vsnslo, MODA, B output will be switched to high level to pass the charging current to the battery.

When SNSA, B voltage is greater than vsnshi, Moda, B output is switched to low -cutting to the battery charging current.

When the grid for the current source of external regulation, SNSA, B pins are connected to VSS without a sensor resistance.

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