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PT8A2707 の電気的特性と機能

PT8A2707のメーカーはPericom Semiconductorです、この部品の機能は「Charger Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 PT8A2707
部品説明 Charger Controller
メーカ Pericom Semiconductor
ロゴ Pericom Semiconductor ロゴ 




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PT8A2707 Datasheet, PT8A2707 PDF,ピン配置, 機能
PT8A2707-12/17-19
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Charger Controller with Fuel-Guage & LCD/LED Display
Product Features
2-3 cells, NiCd or NiMH battery fast-charger controller for battery-embedded devices
Precise 7-bit fuel-gauge-counter measures charging and discharging current through battery pack. Make it possible
to accurately indicate battery capacity through LCD (PT8A2707-09/2717-19) or LEDs (PT8A2710-12).
Integrated with a DC/DC step-down controller make it possible for customers to manufacture just one
PCB module that can:
Cover different product models that requires different charging current/speed by changing only one resistor;
Work with different kinds of AC/DC adapters with wide input voltage ranges.
Motor also can work in both corded or cordless conditions. When motor is used in cord-mode, the
charging current to battery is regulated at a maximum value of 1/10 of the fast-charging current. The
battery is just like being slowly-charged and prevented from being exposed to a prolonged high-current
charging profile.
Provide excellent charge and discharge protections.
Available with different parts to cover products employing slide switch (PT8A2707/10/17), tact switch
(PT8A2708/09/11/12/18/19) input to control motor ON/OFF. Two-step motor-speed control (70%, 100%) is also
available in PT8A2708/2711/2718.
Very low standby current of typical 20A. Products could typically work in standby-mode for a few months,
depends on battery capacity.
Technology Highlights
Employing 5 major charging states: cool-down / pre-charge / fast charge / trickle charge / stop charge, taking the
best care for different battery conditions, especially for aged or dry batteries
Excellent battery protection and full-charge detection schemes
Negative delta voltage detection (-ΔV) with precision of +/-1mV step
Maximum battery voltage detection to turn to maintenance
Rate of change of temperature detection (dT/dt) best for NiMH batteries full-charge termination (use with
NTC)
Abnormal high battery temperature (55C) detection to stop charging (use with NTC)
Flexible fast charge time-out setting (30mins/60mins/90mins/150mins)
Fuel-gauge counter takes into account the battery self-discharge compensation based on time.
Provide excellent battery over-discharge protection through auto-stop motor at once (<0.2s) when
discharging current is higher than preset limit value for 3sec (3 limit values selectable externally)
battery pack voltage is lower than No-Power value (adjustable externally)
NTC measures battery pack temperature higher than preset high-temp value(adjustable externally)
Key delay to reject multiple inputs at Tact switch (about 0.125s ignorance).
Internal voltage regulator provides better rejection to interference.
Integrated DC/DC step-down controller to regulate constant charging currents at different charging
Available with 24-pin SOIC and SSOP lead-free package
12-07-0005
PT0268-1 07/05/12
1

1 Page





PT8A2707 pdf, ピン配列
PT8A2707-12/17-19
Charger Controller
with Fuel-Guage & LCD/LED Display
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Flow Chart
POWER UP (1)
STOP
CHARGE
PRE
CHARGE
> 55C
(8) 45C
fast
chg (5)
> 55C
(8)
45C
FAST
CHARGE
> 55C (8)
Full
Bat. (6)
cord
off
cord
on/off
cord
off
motor
on/off
(2)(3)(4)
IDLE
motor
on/off
(2)(3)
motor
on/off
(2)(3)(4)
MOTOR
motor
on/off
(2)(3)(4)
FULL
CHARGE
cord on/off (7)
motor
on/off
(2)(3)
Notes:
1) The system goes to idle when it is power-up. The system is waked up when cord is plugged, motor is turned on
or both.
2) Motor is turned on/off by tact switch or slide switch.
3) Motor will be turned off automatically when:
a) the voltage of the battery pack is lower than 1.8V or (adjustable externally);
b) the motor is drawing current more than the preset limit or (adjustable externally);
c) the battery pack temperature is higher than 55C (adjustable externally)
4) During charging when motor is turned on, the charging current is regulated at 1/10 of the fast-charging current.
When motor is turned off, the system will determine to go back to pre-charge/fast-charge/full-charge according
to the battery usage condition (more details could be obtained in the operation description).
5) Enter fast-charging when
a) battery temperature is less than 45C
b) battery voltage is higher than 2V or after pre-charging for 3 minutes
6) Enter full-charge state when one of the following full-charge criteria is reached:
a) safety timer timeout (4 external selections)
b) max. voltage 3.4V (adjustable externally)
c) -V
d) dT/dt (adjustable by component selections)
7) If the battery pack is previously fully-charged without any usage or self-discharged enough, the charger goes
directly to maintenance (trickle charge) when cord is plugged again.
8) Charger stops charging current when battery temperature is higher than 55C but resume for charging when
battery temperature falls below 45C
12-07-0005
PT0268-1 07/05/12
3


3Pages


PT8A2707 電子部品, 半導体
PT8A2707-12/17-19
Charger Controller
with Fuel-Guage & LCD/LED Display
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Function description (refer to Flow Chart)
1. Battery Voltage Definitions:
Item
No-Power value
Battery-Low value
Max VB
Table 3: Battery Voltage Definition
General Setting
Suggested Value
0.9V-1.0V/cell
1.8-2V for 2cells battery pack
1.0V-1.1V/cell
2.0-2.2V for 2cells battery pack
1.65V-1.7V/cell
3.3-3.4V for 2cells battery pack
Remark
Adjustable externally,
please refer to
„application instruction‟
2. Charging Mechanism (cord is connected but motor is off)
When a cord is detected, pre-charge begins. If the battery voltage is higher than Battery-Low threshold (usually set between
0.95V-1.1V/cell) and the battery pack temperature is less than 45C, fast-charge starts. Otherwise, the battery will be kept in
pre-charge status until its voltage is higher than the preset Battery-Low value or a 3 minutes time-out is reached to enter fast-
charge mode. If battery temperature is found increasing to 55C during pre-charge state, battery charging is stopped (DC/DC
cuts power) to enter cool down state. Nevertheless, pre-charge will continue in any case until the battery temperature is
cooled down below 45C.
When entering fast-charge mode, if the battery voltage is below a preset voltage level (usually set at about 1.3V-1.4V/cell,
measured with charging current), a start-up timer is effective to avoid false triggering of -ΔV and dT/dt to have early fast-
charge termination. During the start-up time, -ΔV and dT/dt detections are ignored but maximum temperature of 55C will
always be observed to stop fast-charge. The start-up timer is dependent to the external fast-charge timer setting as tabled
below. The dT/dt data is valid for battery temperature in range of 35C to 55C.
Table 4: Start-up Time
Timer
Tmax (User programmable externally)
Start-up timer for inhibiting
tmax/20
negative V and dT/dt
tmax (min)
Start-up time (s)
measurement
30
90
60 180
90 270
150 450
Fast charge mode is terminated when any one of the following conditions meet:
1) Minus-delta-V Detection (-V): The battery pack voltage is sampled by high precision A/D converter every 10s, with 0.5s
sampling time. For each sampling interval (0.5s), the charging current is cut down. Averaging is performed on the collected
data and the result is stored into registers after passing through high-order digital filter. The minus-delta-V is qualified when a
voltage drop of about 5mV/cell from the maximum voltage recorded. The second minus-delta-V is qualified when a voltage
drop of about 5mV/cell after the first minus-delta-V has been qualified. Every minus-delta-V happened, fuel-gauge increased
one level up, and so and so until fuel-gauge is full.
Table 5: Sample Description
Bypass Start-up timer
VB > 2.6V (measured by sampling)
VB sampling period (tp)
10s
VB sampling time
0.5s (fast-charging inhibition)
BT sampling period (tp)
10s (time-multiplexing with VB sampling)
tp=0.5s
VB measurement
BT measurement
2) Maximum Battery Voltage Detection: When the averaged battery pack voltage reaches a preset maximum voltage limit
(usually set about 1.6V-1.7V/cell) during the charging interval, fast-charge in terminated.
3) Battery Temperature Detection (Max. Temp and dT/dt): The PT8A2707-12/2717-19 employs thermistor(NTC) as battery
temperature sensor. When the battery temperature reaches 55C, fast-charge is terminated and the battery will then go to cool
down mode; or the rate of temperature change (dT/dt) reaches preset value, fast-charge is terminated and the battery will then
be under trickle-charge mode at a rate of 1/10 of the fast-charge current. If NTC is not employed, the pin “VT” should be
biased at an equivalent voltage as for 10C-20C or else the PT8A2707-12/2717-19 determines the NTC is opened and will
stop all charging activity forever.
12-07-0005
PT0268-1 07/05/12
6

6 Page



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