參數(shù)資料
型號(hào)： TEA1103TS
廠商： NXP SEMICONDUCTORS
元件分類： 穩(wěn)壓器
英文描述： TERM BLOCK 7.5MM VERT 3POS PCB
中文描述： 0.014 A BATTERY CHARGE CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO20
封裝： 5.30 MM, PLASTIC, MO-150AE, SOT-339-1, SSOP-20
文件頁數(shù)： 11/28頁
文件大?。?/td> 302K
代理商： TEA1103TS
1999 Jan 27
11
Philips Semiconductors
Preliminary specification
Fast charge ICs for NiCd and NiMH
batteries
TEA1103; TEA1103T;
TEA1103TS
At an increase of the battery voltage the 14-bit
Analog-to-Digital Converter (ADC) is refreshed with this
new value. Therefore, the digitized value always
represents the maximum battery voltage. A decreased
V
bat
voltage is not stored, but is compared to the stored
value.
Full is detected when the voltage decrease of V
bat
is
1
4
%
of the stored peak battery value. To avoid interference due
to the resistance of the battery contacts during battery
voltage sensing, the charge current is regulated to zero
during t = 2
10
×
POD
×
t
osc
, via the regulation pins AO and
PWM. At the last period, the V
bat
voltage is sensed and
stored in a sample-and-hold circuit. This approach
ensures very accurate detection of the battery full
condition (minus
1
4
%).
When battery full is determined by
T/
t, the voltage on
the NTC pin is used as the input voltage to the AD/DA
converter. The sampling time at
T/
t sensing is given by
the following equation:
T
t
(9)
After this initialized sample time the new temperature
voltage is compared to the preceding AD/DA voltage and
the AD/DA is refreshed with this new value. A certain
increase of the temperature is detected as full battery,
depending on the initialization settings. The decision of full
detection by
T/
t or V
peak
is digitally filtered thus avoiding
false battery full detection.
t
sampling
-------
2
17
POD
×
PSD
×
t
osc
×
=
Output drivers
The charge current regulation signal is available at two
output pins, AO and PWM.
A
NALOG OUTPUT
The analog control voltage output at pin 18 (AO) can be
used to drive an opto-coupler in mains separated
applications when an external resistor is connected
between AO and the opto-coupler. The maximum current
through the opto-coupler diode is 2 mA. The voltage gain
of amplifier A2 is typical 11 dB (times 3.5). The DC voltage
transfer is given by the following equation:
V
AO
= 3.5
×
(V
LS
1.35).
The AO output can be used for:
Linear (DC) applications
Not mains isolated SMPS with a separate controller
Mains isolated SMPS, controlled by an opto-coupler.
P
ULSE
W
IDTH
M
ODULATOR
(PWM)
The LS voltage is compared internally with the oscillator
voltage to deliver a pulse width modulated output at PWM
(pin 15) to drive an output switching device in a SMPS
converter application via a driver stage. The PWM output
is latched to prevent multi-pulsing. The maximum duty
factor is internally fixed to 79% (typ.). The PWM output can
be used for synchronization and duty factor control of a
primary SMPS via a pulse transformer.
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