參數(shù)資料
型號(hào)： LTC3731CUH
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 16-Bit Edge-Triggered D-Type Flip-Flop With 3-State Outputs 48-SSOP -40 to 85
中文描述： 5 A SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, PLASTIC, M0-220WHHD, QFN-32
文件頁(yè)數(shù)： 9/16頁(yè)
文件大?。?/td> 200K
代理商： LTC3731CUH
LT3782
9
3782fa
APPLICATIU
Layout Considerations
To prevent EMI, the power MOSFETs and input bypass
capacitor leads should be kept as short as possible. A
ground plane should be used under the switching circuitry
to prevent interplane coupling and to act as a thermal
spreading path. Note that the bottom pad of the package
is the heat sink, as well as the IC signal ground, and must
be soldered to the ground plane.
In a boost converter, the conversion gain (assuming
100% efficiency) is calculated as (ignoring the forward
voltage drop of the boost diode):
W
U
U
V
V
D
OUT
IN
=
1
1
where D is the duty ratio of the main switch. D can then be
estimated from the input and output voltages:
D
V
V
D
V
V
IN
OUT
MAX
IN MIN
(
OUT
=
1
=
1
;
)
The Peak and Average Input Currents
The control circuit in the LT3782 measures the input
current by using a sense resistor in each MOSFET source,
so the output current needs to be reflected back to the
input in order to dimension the power MOSFET properly.
Based on the fact that, ideally, the output power is equal to
the input power, the maximum average input current is:
I
D
MAX
–
The peak current is:
I
D
MAX
–
1
The maximum duty cycle, D
MAX
, should be calculated at
minimum V
IN
.
I
IN MAX
(
O MAX
(
)
)
=
1
I
IN PEAK
(
O MAX
(
)
)
=
1.
Power Inductor Selection
In a boost circuit, a power inductor should be designed to
carry the maximum input DC current. The inductance
should be small enough to generate enough ripple current
to provide adequate signal to noise ratio to the LT3782. An
empirical starting of the inductor ripple current (per phase)
is about 40% of maximum DC current, which is half of the
input DC current in a 2-phase circuit:
I
I
V
V
I
V
V
L
OUT MAX
(
OUT
IN
OUT MAX
(
OUT
IN
=
40
2
20
%
%
)
)
where V
IN
, V
OUT
and I
OUT
are the DC input voltage, output
voltage and output current, respectively.
And the inductance is estimated to be:
L
V
f
s
D
I
L
IN
=
where f
s
is the switching frequency per phase.
The saturation current level of inductor is estimated to be:
I
I
I
I
V
V
SAT
L
IN
2
OUT MAX
(
OUT
IN MIN
(
≥
+
2
70%
)
)
Sense Resistor Selection
During the switch on-time, the control circuit limits the
maximum voltage drop across the sense resistor to about
60mV. The peak inductor current is therefore limited to
60mV/R. The relationship between the maximum load
current, duty cycle and the sense resistor R
SENSE
is:
D
I
O MAX
1.
R
V
SENSE MAX
MAX
(
2
≤
(
)
)
–
1
相關(guān)PDF資料
PDF描述
LTC3731IG 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller
LTC3731IUH 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller
LTC3731H 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller
LTC3731HG 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller
LTC3738 16-Bit Buffer/Driver With 3-State Outputs 48-TSSOP -40 to 85
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3731CUH#PBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC3731CUH#PBF 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 600KHZ, 240A, QFN
LTC3731CUH#TR 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC3731CUH#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC3731HG 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
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