参数资料
| 型号： | NCV898031D1R2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 8SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2.2MHz |
| 占空比： | 90% |
| 电源电压： | 3.2 V ~ 40 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | * |
| 包装： | * |
NCV898031
BOOST TOPOLOGY APPLICATION INFORMATION
Oscillator
PWM Comparator
S Q
R
Gate
Drive
GDRV
L
V IN
V OUT
I SNS
+
CSA
Slope
Compensation
V FB
Voltage Error
VEA
NCV898031
Compensation
Figure 11. Boost Current Mode Schematic
C O
R L
w t on(min)
Design Methodology
This section details an overview of the component
selection process for the NCV898031 in continuous
conduction mode boost. It is intended to assist with the
design process but does not remove all engineering design
work. Many of the equations make heavy use of the small
ripple approximation. This process entails the following
steps:
1. Define Operational Parameters
2. Select Current Sense Resistor
3. Select Output Inductor
4. Select Output Capacitors
5. Select Input Capacitors
6. Select Feedback Resistors
7. Select Compensator Components
8. Select MOSFET(s)
9. Select Diode
Define Operational Parameters
Before beginning the design, define the operating
parameters of the application. These include:
V IN(min) : minimum input voltage [V]
V IN(max): maximum input voltage [V]
V OUT : output voltage [V]
I OUT(max) : maximum output current [A]
I CL : desired typical cycle ? by ? cycle current limit [A]
From this the ideal minimum and maximum duty cycles can
be calculated as follows:
Both duty cycles will actually be higher due to power loss
in the conversion. The exact duty cycles will depend on
conduction and switching losses. If the maximum input
voltage is higher than the output voltage, the minimum duty
cycle will be negative. This is because a boost converter
cannot have an output lower than the input. In situations
where the input is higher than the output, the output will
follow the input, minus the diode drop of the output diode
and the converter will not attempt to switch.
If the calculated D WC is higher than the D max limit of the
NCV898031, the conversion will not be possible. It is
important for a boost converter to have a restricted D max ,
because while the ideal conversion ratio of a boost converter
goes up to infinity as D approaches 1, a real converter ’s
conversion ratio starts to decrease as losses overtake the
increased power transfer. If the converter is in this range it
will not be able to regulate properly.
If the following equation is not satisfied, the device will
skip pulses at high V IN :
D min
f s
Where: f s : switching frequency [Hz]
t on(min) : minimum on time [s]
D min + 1 *
D WC + 1 *
V IN(max)
V OUT
V IN(WC)
V OUT
http://onsemi.com
12
相关PDF资料 |
PDF描述 |
|---|---|
| NE57810S/G,518 | IC DDR TERM REGULATOR SOT756 |
| NE57811S/G,518 | IC DDR TERM REGULATOR SOT756 |
| NIC9N05TS1 | MOSFET PWR N-CH 55V 2.6A DIE |
| NID5001NT4 | MOSFET N-CH 42V 33A DPAK |
| NID5003NT4 | MOSFET N-CH 42V 20A DPAK |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV898031SEPGEVB | 制造商:ON Semiconductor 功能描述:NCV898031 SEPIC EVAL BD - Bulk 制造商:ON Semiconductor 功能描述:BOARD EVAL FOR NCV898031 |
| NCVT-1 | 制造商:KLEIN TOOLS 功能描述:NON-CONTACT VOLTAGE TESTER W/BATT, 50-1000V 制造商:Klein Tools Inc 功能描述:Testing Equipment Non-Contact Voltage Testers |
| NCVT-1SEN | 制造商:Klein Tools Inc 功能描述:Non-Contact Voltage Tester 制造商:KLIEN TOOLS 功能描述:NON-CONTACT VOLTAGE TESTER 50-1000 VOLTS 制造商:KLIEN TOOLS 功能描述:Non-Contact Voltage Tester - w/ Batteries, 50-1000 Volts, Clip-Strip |
| NCVT-2 | 制造商:KLEIN TOOLS 功能描述:DUAL RANGE NON-CONTACT VOLTAGE TESTER- W/BATTERIES 12-1000 V |
| NCVT-3 | 功能描述:NON-CONTACT VOLTAGE TESTER WITH 制造商:klein tools, inc. 系列:- 零件状态:在售 类型:电压检测器 规格:测量交流电压 12 ~ 1000VAC 等级:CAT IV 1000V 标准包装:6 |
发布紧急采购，3分钟左右您将得到回复。