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參數(shù)資料
| 型號： | 935260439112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.014 A BATTERY CHARGE CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 7.50 MM, PLASTIC, SO-20 |
| 文件頁數(shù)： | 31/31頁 |
| 文件大?。?/td> | 417K |
| 代理商： | 935260439112 |
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1999 Jan 27
9
Philips Semiconductors
Preliminary specication
Fast charge ICs for NiCd, NiMH, SLA and
LiIon
TEA1102; TEA1102T;
TEA1102TS
To ensure an eventual load during all charging states, the
fast charge mode will be entered again if the battery
voltage drops below 15 V for SLA or 3 V for Lilon.
When charging, the standby mode (LiIon and SLA) can
only be entered after a certain period of time depending on
time-out. The same applies for charging NiCd or NiMH
batteries. To support full test of the TEA1102x at
application, the standby mode is also entered when
Vbat <Vbat(l) at fill-up or top-off respectively.
Timer
The timing of the circuit is controlled by the oscillator
frequency.
The timer block defines the maximum charging time by
‘time-out’. At a fixed oscillator frequency, the time-out time
can be adapted by the Programmable Time-out Divider
(PTD) using the following equation.
(6)
t
time
out
–
2
26
POD
×
PTD
×
t
osc
×
=
The time-out timer is put on hold by low voltage,
temperature protection and during the inhibit mode.
The Programmable Oscillator Divider (POD) enables the
oscillator frequency to be increased without affecting
the sampling time and time-out. Raising the oscillator
frequency will reduce the size of the inductive components
that are used.
At fast charging, after battery insertion, after refresh or
supply interruption, the full detector will be disabled for a
period of time to allow a proper start with flat or inverse
polarized batteries. This hold-off period is disabled at fast
charging by raising pin Vstb to above ±5 V (once).
So for test options it is possible to slip the hold-off period.
The hold-off time is defined by the following equation:
(7)
Table 2 gives an overview of the settings of timing and
discharge/charge currents.
t
hold
off
–
2
5
–
t
time
out
–
×
=
Table 2
Timing and current formulae
SYMBOL
DESCRIPTION
FORMULAE
tosc
timing
see Fig.3
Tsampling (T/t)
NTC voltage sampling frequency
217
× POD × PSD × tosc
Tsampling (Vpeak)
battery voltage sampling frequency
216
× POD × tosc
ttop-off
227
× POD × tosc
ttime-out
226
× POD × PTD × t
osc
thold-off
25
× ttime-out
tLED
inhibit or protection
214
× POD × tosc
tsense
210
× POD × tosc
tswitch
221
× POD × PTD × t
osc
Ifast
charge/discharge currents
Itop-off
Itrickle
Iload-max
IRFSH
R
b
R
sense
-----------------
V
ref
R
ref
----------
×
R
b
R
sense
-----------------
3
×
10
6
–
×
R
b
R
sense
-----------------
15
16
------
×
10
6
–
×
R
b
R
sense
-----------------
40
×
10
6
–
×
100 mV
R
sense
--------------------
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