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參數(shù)資料
| 型號： | LTC4110EUHF#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC38 |
| 封裝： | 5 X 7 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數(shù)： | 31/52頁 |
| 文件大?。?/td> | 450K |
| 代理商： | LTC4110EUHF#TR |
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LTC4110
37
4110fb
PROGRAMMING CHARGE VOLTAGE
Depending on the battery chemistry chosen by the TYPE
pin, a charge termination voltage or a oat voltage will be
required. The difference between the two is time. A oat
voltage is applied to a battery forever. The VCHG pin is used
to set any of these voltages and the equations remain the
same. For this document, we will use the term oat voltage
generically. If nickel chemistry is chosen, the VCHG pin is
disabled placing the charger in constant current mode. If
you are using a smart battery, wake-up charge is subject
to the VCHG pin setting when active.
Connecting the VCHG pin to GND will set the default per
cell oat voltage (4.2V for Li-ion, 2.35V for SLA). If a dif-
ferent oat voltage is needed, tie the VCHG pin to a voltage
between 0.25 VBGR and 0.75 VBGR using a resistor divider
on the VREF pin. Unlike VREF, VBGR is an internal reference
voltage of the same voltage as VREF but with a much tighter
(±0.5%) tolerance than VREF.
VFLOAT = 2
VCHG
VBGR
1 0.6
where
ΔVFLOAT = Adjusted Float Voltage – Default Float Voltage
VCHG = VCHG Pin Voltage,
VBGR = 1.220V
The resistor divider connected to VREF pin will affect timer
(see the Programming Charge Time with TIMER and VREF
Pins section for more details).
THERMISTOR FOR LEAD ACID BATTERIES
When the TYPE pin is programmed for Lead Acid, THA
pin will be force to VBGR, THB will be used to sense the
NTC resistance. The value of R1 is given by:
R1= R0
β 2 T0
β + 2 T0
where:
R0 = thermistor resistance (Ω) at T0
T0 = thermistor reference temperature (°K)
β = exponential temperature coefcient of resistance
The LTC4110 is designed to work best with a 5% 10k NTC
thermistor with a β near 3750, such as the Siemens/EPCOS
B57620C103J062. In this case, R1 = 7256Ω.
APPLICATIONS INFORMATION
Figure 15. Lead Acid Thermistor
RNTC
TH_HI
VBGR
+
–
TH_LO
RES_OR
RES_HOT
HI_REF
REF LO_REF
+
–
THB
R1
THA
LOGIC
+
4110 F15
LEAD ACID BATTERY TEMPERATURE COMPENSATION
To program the temperature compensation for SLA charg-
ing, an external circuit is needed as shown in Figure 16.
The values are given by:
R1= R0
β 2 T0
β + 2 T0
k1=
R0
R0 + R1
TCk1= –
β R1 R0
(R1+ R0)2 T02
k2 =
TCVFLOAT
1.2 TCk1
k3 =
0.5 + ΔVFLOAT / 1.2 k1 k2
1 k2
where:
TCVFLOAT = temperature coefcient of the oat voltage
(Range: –2mV/°C – –6mV/°C)
ΔVFLOAT = oat voltage at 25°C – default oat voltage
2.35V (Range: –0.15V – 0.15V)
For example, if a 10k NTC with β = 3750 is used, desired
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