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參數(shù)資料
| 型號： | LTC1980EGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Combination Battery Charger and DC/DC Converter |
| 中文描述： | BATTERY CHARGE CONTROLLER, 340 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 463K |
| 代理商： | LTC1980EGN |
LTC1980
13
1980i
the transformer which can reduce the leakage inductance,
reduce the need for aggressive snubber design and for this
reason improve efficiency.
Avoid transformer saturationunder all operating condi-
tions and combinations (usually the biggest problems
occur at high output currents and extreme duty cycles.
Also check these conditions for battery charging and
regulation modes.
Finally, in low voltage applications, select a transformer
with low winding resistance. This will improve efficiency at
heavier loads.
Capacitors
Check the RMS current rating on your capacitors on both
sides of your circuit. Low ESR and ESL is recommended
for lowest ripple. OS-CON capacitors (from Sanyo) work
very well in this application.
Diodes
In low voltage applications, Schottky diodes should be
placed in parallel with the drain and source of the MOSFETs
in the PWM supply. This prevents body diode turn on and
improves efficiency by eliminating loss from reverse re-
covery in these diodes. It also reduces conduction loss
during the RGTDR/BGTDR break interval.
The LTC1980 can operate to voltages as low as 2.8V.
Suitable Schottky diodes include the ZHCS1000 (V
F
=
420mV at I
F
= 1A) and SL22/23 (V
F
= 440mV at I
F
= 2A) for
most 500mA to 1A output current applications.
Vendor List
VENDOR
BH Electronics
Coiltronics/Cooper Electronic
Fairchild Semiconductor
COMPONENTS
Transformers
Transformers
MOSFETs
Schottky Rectifiers
TELEPHONE
952-894-9590
561-752-5000
800-341-0392
Vishay (General Semiconductor) MOSFETs
Schottky Rectifiers
OS-CON Capacitors
Transformers
MOSFETs
631-847-3000
408-749-9714
847-956-0666
408-988-8000
Sanyo
Sumida Electric USA
Vishay (Siliconix)
APPLICATIU
Current Sense Resistor
Voltage drop in the current sense resistor should be
limited to approximately
±
100mV with respect to ground
at max load currents in all modes. This value strikes a
reasonable balance between providing an adequate low
current signal, while keeping the losses from this resistor
low. For applications where the inputs and output voltages
may be low, a somewhat lower drop can be used (in order
to reduce conduction losses slightly).
The LTC1980 has several features, such as leading-edge
blanking, which make application of this part easier to use.
However for best charge current accuracy, the current
sense resistor should be Kelvin sensed.
W
U
U
MOSFETs
The LTC1980 uses low side MOSFET switches. There are
two very important advantages. First, N-channel MOSFETs
are used—this generally means that efficiency will be
higher than a comparable on-resistance P-channel device
(because less gate charge is required). Second, low V
T
(‘logic-level’) MOSFETs with relatively low absolute maxi-
mum V
GS
ratings can be used, even in higher voltage
applications. Refer to Application Note 19 for information
on determining MOSFET voltage and current ratings.
Transformer
Turns ratio affects the duty factor of the power converter
which impacts current and voltage stress on the power
MOSFETs, input and output capacitor RMS currents and
transformer utilization (size vs power). Using a 50% duty
factor under nominal operating conditions usually gives
reasonable results. For a 50% duty factor, the turns ratio
is:
N = V
REG
/V
BAT
N should be calculated for the design operating as a DC/DC
converter and as a battery charger. The final turns ratio
should be chosen so that it is approximately equal to the
average of the two calculated values for N. In addition
choose a turns ratio which can be made from the ratio of
small integers. This allows bifilar windings to be used in
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| LTC1980EGN#PBF | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP RoHS:是 類別: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) |
| LTC1980EGN#TR | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP RoHS:否 類別: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) |
| LTC1980EGN#TRPBF | 功能描述:IC PWM BATT CHARGER/CONV 24-SSOP RoHS:是 類別: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) |
| LTC1981ES5 | 制造商:Linear Technology 功能描述:MOSFET DRVR 1-OUT Hi Side 5-Pin TSOT-23 |
| LTC1981ES5#PBF | 制造商:Linear Technology 功能描述:MOSFET DRVR 1-OUT Hi Side 5-Pin TSOT-23 制造商:Linear Technology 功能描述:DP-Power Controller, CUT TAPE Single Micropower Hi Side Sw Controller 制造商:Linear Technology 功能描述:DRIVER, MOSFET, HIGH/LOW SIDE, SOT-23, Device Type:MOSFET, Module Configuration:High Side, Low Side, Supply Voltage Min:1.8V, Supply Voltage Max:5.5V, Driver Case Style:SOT-23, No. of Pins:5, Operating Temperature Min:-40C , RoHS Compliant: Yes |
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