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| 型号： | NCP1395ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 18/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM VM 16-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1.11MHz |
| 占空比： | 52% |
| 电源电压： | 9.3 V ~ 20 V |
| 降压： | 无 |
| 升压： | 无 |
| 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 ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 剪切带 (CT) |
| 其它名称： | NCP1395ADR2GOSCT |
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NCP1395A/B
Deadtime Control
Deadtime control is an absolute necessity when the
half ? bridge 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 m 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
S
Idis
Ct
+
+
?
3 V ? 1 V
D
Clk
R
Q
Q
Vref
DT
RDT
Figure 41. Deadtime Generation
A
B
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 W ) and 1.0 m s (RDT
= 600 k W ). Figure 44 shows the typical waveforms
obtained on the output.
Soft ? Start Sequence
In resonant controllers, a soft ? start is needed to avoid
circuit. In this controller, a soft ? start 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 soft ? start.
suddenly applying the full current into the resonating
http://onsemi.com
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1395APG | 功能描述:电压模式 PWM 控制器 PWM CONTROLLER RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| NCP1395B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller |
| NCP1395BDR2G | 功能描述:电压模式 PWM 控制器 PWM CONTROLLER RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| NCP1395BPG | 功能描述:电压模式 PWM 控制器 PWM CONTROLLER RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| NCP1395D | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller |
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