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BQ24705 Datasheet(PDF) 19 Page - Texas Instruments

Part # BQ24705
Description  Host-Controlled Multi-Cell Battery Charger
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ24705 Datasheet(HTML) 19 Page - Texas Instruments

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ISYNSET
SYN
SENSE
250 V
R
=
I
x R
W
(5)
ISYNSET
SRP
SRN
3.3V
1 V
R
SENSE
5kW
20x
SYNCH
R
ISYNSET
UCP
I=1V/R
ISYNSET
I
SYN
HIGH ACCURACY IADAPT USING CURRENT SENSE AMPLIFIER (CSA)
INPUT OVERVOLTAGE PROTECTION (ACOV)
INPUT UNDERVOLTAGE LOCK OUT (UVLO)
bq24705
www.ti.com............................................................................................................................................... SLUS779B – DECEMBER 2007 – REVISED MARCH 2009
IRIPPLE_MAX happens when the duty-cycle, D is mostly near to 0.5 at given Vin, fs,and L.
The ISYNSET comparator, or charge undercurrent comparator, compares the voltage between SRP-SRN, and
the threshold set by an external resistor RISYNSET, which can be calculated by:
Figure 29. ISYNSET Comparator Block
An industry standard, high accuracy current sense amplifier (CSA) is used to monitor the input current by the
host or some discrete logic through the analog voltage output of the IADAPT pin. The CSA amplifies the input
sensed voltage of ACP – ACN by 20x through the IADAPT pin. The IADAPT output is a voltage source 20 times
the input differential voltage. Once PVCC is above 5 V and ACDET is above 0.6V, IADAPT no longer stays at
ground, but becomes active. If the user wants to lower the voltage, they could use a resistor divider from IOUT to
AGND, and still achieve accuracy over temperature as the resistors can be matched their thermal coefficients.
A 100-pF capacitor connected on the output is recommended for decoupling high-frequency noise. An additional
RC filter is optional, after the 100-pF capacitor, if additional filtering is desired. Note that adding filtering also
adds additional response delay.
ACOV provides protection to prevent system damage due to high input voltage. The controller enters ACOV
when ACDET > 3.1 V and charge is disabled. ACOV is not latched—normal operation resumes when the ACDET
voltage returns below 3.1 V. ACOV threshold is 130% of the adapter-detect threshold.
The system must have a minimum 4 V PVCC voltage to allow proper operation. This PVCC voltage could come
from either input adapter or battery, using a diode-OR input. When the PVCC voltage is below 4 V the bias
circuits REGN and VREF stay inactive, even with ACDET above 0.6 V.
Copyright © 2007–2009, Texas Instruments Incorporated
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Product Folder Link(s) :bq24705
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