參數(shù)資料
型號(hào)： LTC1760CFW
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： Dual Smart Battery System Manager
中文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO48
封裝： 6.10 MM, PLASTIC, TSSOP-48
文件頁(yè)數(shù)： 32/44頁(yè)
文件大?。?/td> 379K
代理商： LTC1760CFW
LTC1760
32
sn1760 1760is
Automatic Current Sharing
In a dual parallel charge configuration, the LTC1760 does
not actually control the current flowing into each individual
battery. The capacity, or Amp-Hour rating, of each battery
determines how the charger current is shared. This auto-
matic steering of current is what allows both batteries to
reach their full capacity points at the same time. In other
words, given all other things equal, charge termination will
happen simultaneously.
A battery can be modeled as a huge capacitor and hence
governed by the same laws.
I = C (dV/dT) where:
–
+
C
B1
C
B2
CSN
1760 F07
EA
V
REF
V
SET
R
7.2k
R
VF
405.3k
Σ
MODULATOR
SWV
11
TO
I
TH
DAC
VALUE
(11 BITS)
Figure 7. Voltage DAC Operation
–
+
1760 F08
V
REF
I
SET
R
18.77k
Σ
MODULATOR
10
TO
I
TH
DAC
VALUE
(10 BITS)
C
SET
(V
CSP
– V
CSN
)
3k
(FROM CA1 AMPLIFIER)
Figure 8. Current Dac Operation
(11/8)R
VSET
/(VDAC
(VALUE)
/2047). In regulation, V
SET
is
servo driven to the 0.8V reference voltage, V
REF
.
R
SET
is matched against a current derived from the voltage
between pins CSP and CSN. This current is (V
CSP
– V
CSN
)/
3k.
Therefore programmed current is:
I
CHG
= 0.8 V
REF
3k/(R
SNS
R
SET
) (IDAC
(VALUE)
/1023)
= (102.3mV/R
SNS
) (IDAC
(VALUE)
/1023)
OPERATIOU
APPLICATIOU
W
U
U
Capacitors C
B1
and C
B2
are used to average the voltage
present at the V
SET
pin as well as provide a zero in the
voltage loop to help stability and transient response time
to voltage variations.
10 The Current DAC Block
The current DAC is a delta-sigma modulator which
controls the effective value of an internal resistor,
R
SET
=18.77k, used to program the maximum charger
current. Figure 8 is a simplified diagram of the DAC
operation. The delta-sigma modulator and switch convert
the IDAC value to a variable resistance equal to 1.25R
SET
/
(IDAC
(VALUE)
/1023). In regulation, I
SET
is servo driven to
the 0.8V reference voltage, V
REF
, and the current from
During wake-up current operation, the current DAC enters
a low current mode. The current DAC output is pulse-width
modulated with a high frequency clock having a duty cycle
value of 1/8. Therefore, the maximum output current
provided by the charger is I
MAX
/8. The delta-sigma output
gates this low duty cycle signal on and off. The delta-sigma
shift registers are then clocked at a slower rate, about
40ms/bit, so that the charger has time to settle to the I
MAX
/
8 value.
I = The current flowing through the capacitor
C = Capacity rating of battery (using amp-hour values
instead of capacitance)
dV = Change in voltage
dt = Change in time
The equivalent model of a set or parallel batteries is a set
of parallel capacitors. Since they are in parallel, the change
in voltage over change in time is the same for both
batteries one and two.
dV/dt
BAT1
= dV/dt
BAT2
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1760CFW#PBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱(chēng):497-10526-2
LTC1760CFW#PBF 制造商:Linear Technology 功能描述:Battery Management IC 制造商:Linear Technology 功能描述:IC, BATTERY CHARGER, 4.28A, TSSOP-48
LTC1760CFW#TR 功能描述:IC MANAGER BATTERY SYS 48-TSSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1760CFW#TRPBF 功能描述:IC MANAGER BATTERY DUAL 48TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC1760CFWPBF 制造商:Linear Technology 功能描述:Dual Smart Battery Sys. Manager TSSOP48
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