参数资料
| 型号： | NCP1397ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 560kHz |
| 占空比： | 52% |
| 电源电压： | 10.3 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： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽）15 引线 |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页
NCP1397A, NCP1397B
V DD
FBinternal
+
-
max
F SW
Vref
Imin
0 to IFmax
max
D
S
Q
Rt
Rt sets
Fmin for V(FB) = 0
Cint
+
+
-
Clk
R
Q
V DD
IDT
Vref
Imin
A
B
DT
RDT sets
V CC
the deadtime
Fmax
Fmax sets
the maximum F SW
V DD
FB
RFB
+
-
VFB < VFB(off)
Start fault timer
20 k
Vb(off)
+
Figure 25. The Simplified VCO Architecture
The designer needs to program the maximum switching
frequency and the minimum switching frequency. In LLC
configurations, for circuits working above the resonant
frequency, a high precision is required on the minimum
V CC
frequency, hence the $ 3% specification. This minimum
switching frequency is actually reached when no feedback
closes the loop. It can happen during the startup sequence,
a strong output transient loading or in a short ? circuit
condition. By installing a resistor from Pin 4 to GND, the
minimum frequency is set. Using the same philosophy,
wiring a resistor from Pin 2 to GND will set the maximum
frequency excursion. To improve the circuit protection
features, we have purposely created a dead zone, where the
FB
R1
11.3 k
R3
100 k
R2
8.7 k
D1
2.3 V
+
?
+
Vref
0.5 V
Fmax
RFmax
feedback loop has no action. This is typically below 1.1 V.
Figure 26 details the arrangement where the internal voltage
(that drives the VCO) varies between 0 and 2.3 V. However,
to create this swing, the feedback pin (to which the
optocoupler emitter connects), will need to swing typically
Figure 26. The OPAMP Arrangement Limits the
VCO Modulation Signal between 0.5 and 2.3 V
between 1.1 V and 5.3 V.
http://onsemi.com
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1397B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
| NCP1397BDR2G | 功能描述:电流型 PWM 控制器 NCP1397B RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| NCP1397DR2G | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
| NCP1398_13 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
| NCP1398B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller with Integrated High-Voltage Drivers |
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