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參數資料
| 型號： | NCP1395ADR2G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 英文描述： | High Performance Resonant Mode Controller |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOIC-8 |
| 文件頁數： | 18/27頁 |
| 文件大小： | 345K |
| 代理商： | NCP1395ADR2G |
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NCP1395A/B
http://onsemi.com
18
Deadtime Control
Deadtime control is an absolute necessity when the
halfbridge configuration comes to play. The deadtime
technique consists of inserting a period during which both
high and low side switches are off. Of course, the deadtime
amount differs depending on the switching frequency,
hence the ability to adjust it on this controller. The option
ranges between 150 ns and 1.0 s. The deadtime is actually
made by controlling the oscillator discharge current.
Figure 41 portrays a simplified VCO circuit based on
Figure 33.
Vdd
Icharge:
Fsw min + Fsw max
Idis
Ct
RDT
DT
Vref
+
3 V1 V
+
Clk
D
S
Q
Q
R
A
B
Figure 41. Deadtime Generation
During the discharge time, the clock comparator is high
and unvalidates the AND gates: both outputs are low. When
the comparator goes back to the high level, during the
timing capacitor Ct recharge time, A and B outputs are
validated. By connecting a resistor RDT to ground, it
creates a current whose image serves to discharge the Ct
capacitor: we control the deadtime. The typical range
evolves between 150 ns (RDT = 30 k ) and 1.0 s (RDT
= 600 k ). Figure 44 shows the typical waveforms
obtained on the output.
SoftStart Sequence
In resonant controllers, a softstart is needed to avoid
suddenly applying the full current into the resonating
circuit. In this controller, a softstart capacitor connects to
pin 4 and offers a smooth frequency variation upon startup:
when the circuit starts to pulse, the VCO is pushed to the
maximum switching frequency imposed by pin 2. Then, it
linearly decreases its frequency toward the minimum
frequency selected by a resistor on pin 1. Of course,
practically, the feedback loop is suppose to take over the
VCO lead as soon as the output voltage has reached the
target. If not, then the minimum switching frequency is
reached and a fault is detected on the feedback pin
(typically below 600 mV). Figure 43 depicts a typical
frequency evolution with softstart.
相關PDF資料 |
PDF描述 |
|---|---|
| NCP1395BDR2G | High Performance Resonant Mode Controller |
| NCP1395BPG | High Performance Resonant Mode Controller |
| NCP1395A | High Performance Resonant Mode Controller(高性能諧振模式控制器) |
| NCP1395B | High Performance Resonant Mode Controller(高性能諧振模式控制器) |
| NCP1400A(中文) | 100 mA, Fixed Frequency PWM Step-Up Micropower Switching Regulator(100mA,固定頻率PWM升壓微功率開關穩壓器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1395APG | 功能描述:電壓模式 PWM 控制器 PWM CONTROLLER RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| NCP1395B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Performance Resonant Mode Controller |
| NCP1395BDR2G | 功能描述:電壓模式 PWM 控制器 PWM CONTROLLER RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| NCP1395BPG | 功能描述:電壓模式 PWM 控制器 PWM CONTROLLER RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| NCP1395D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High Performance Resonant Mode Controller |
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