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TEA1102T/N3 View Datasheet(PDF) - Philips Electronics

Part NameDescriptionManufacturer
TEA1102T/N3 Fast charge ICs for NiCd, NiMH, SLA and LiIon Philips
Philips Electronics Philips
TEA1102T/N3 Datasheet PDF : 28 Pages
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Philips Semiconductors
Fast charge ICs for NiCd, NiMH, SLA and
LiIon
Preliminary specification
TEA1102; TEA1102T;
TEA1102TS
At an increase of the battery voltage the 14-bit
analog-to-digital convertor (ADC) is refreshed with this
new value. Therefore, the digitized value always
represents the maximum battery voltage. A decreased
Vbat voltage is not stored, but is compared to the stored
value.
Full is detected when the voltage decrease of Vbat is 14%
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 = 210 × POD × tosc, via the regulation pins AO and
PWM. At the last period, the Vbat voltage is sensed and
stored in a sample-and-hold circuit. This approach
ensures very accurate detection of the battery full
condition (minus 14%).
When battery full is determined by T/t, the voltage on
the NTC pin is used as the input voltage to the AD/DA
convertor. The sampling time at T/t sensing is given by
the following equation:
ts
amplin
g
-----T-t-
=
217 × POD × PSD × tosc
(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 Vpeak is digitally filtered thus avoiding
false battery full detection.
Output drivers
The charge current regulation signal is available at two
output pins, AO and PWM.
ANALOG 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:
Vao = 3.5 × (VLS 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.
PULSE WIDTH MODULATOR (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.
1999 Jan 27
11
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