参数资料
| 型号： | NCP1396BDR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM VM 16-SOIC |
| 产品变化通告： | Package Pin Removal 11/Feb/2008 |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 575kHz |
| 占空比： | 52% |
| 电源电压： | 10.5 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： | 标准包装 |
| 其它名称： | NCP1396BDR2GOSDKR |
NCP1396A, NCP1396B
products where the designer can use an external
startup resistor, whereas the B is more
recommended for industrial / medical
applications where a 12 V auxiliary supply
directly powers the chip.
2. The A version does not activate the soft-- start
upon release of the fast fault input. This is to let
the designer implement skip cycle. To the
opposite, the B version goes back to operation
upon the fast fault pin release via a soft-- start
sequence.
Vdd
Voltage--Controlled Oscillator
The VCO section features a high-- speed circuitry
allowing operation from 100 kHz up to 1 MHz. However,
as a division by two internally creates the two Q and Q
outputs, the final effective signal on output Mlower and
Mupper switches between 50 kHz and 500 kHz. The VCO
is configured in such a way that if the feedback pin goes up,
the switching frequency also goes up. Figure 31 shows the
architecture of this oscillator.
FBinternal
+
-
max
Fsw
Rt
Rt sets
Fmin for V(FB) = 0
Vref
Imin
Cint
0 to I_Fmax
+
+
-
max
S
D
Clk
R
Q
Q
Vdd
IDT
Vref
Imin
A
B
DT
Rdt sets
V CC
the dead--time
Fmax
Fmax sets
the maximum Fsw
Vdd
FB
+
Vfb < Vb_off
Rfb
20 k
Vb_off
+
-
Start fault timer
Figure 31. 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
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
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
feedback loop has no action. This is typically below 1.2 V.
Figure 32 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 between 1.2 V and 5.3 V.
minimum frequency is set. Using the same philosophy,
http://onsemi.com
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1396BPG | 功能描述:电压模式 PWM 控制器 RESONANT MODE CNTRLR W/ H/L SIDES DRIVERS 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 |
| NCP1396D | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Performance Resonant Mode Controller featuring High--Voltage Drivers |
| NCP1397A | 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 |
| NCP1397ADR2G | 功能描述:电流型 PWM 控制器 NCP1397A 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 |
| 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 |
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