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参数资料
| 型号： | NCP1395ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/27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
To the contrary, when the internal BO signal is high
(A and B pulse), the IBO source is activated and creates
a hysteresis. The hysteresis level actually depends
on the circuit: NCP1395A features a 28 m A whereas
the NCP1395B uses a 83 m A current. Changes are
IBO is off
implemented to a) reduce the standby power on the
NCP1395A b) improve the noise immunity on the
NCP1395B. Knowing these values, it becomes possible to
select the turn ? on and turn ? off levels via a few lines of
algebra:
IBO is on
V( ) ) + Vbulk1
Rlower
Rlower ) Rupper
(eq. 1)
V( ) ) + Vbulk2
Rlower
Rlower ) Rupper
) IBO
Rlower Rupper
Rlower ) Rupper
(eq. 2)
Rupper + Rlower
Rlower + VBO
We can now extract Rlower from Equation 1 and plug it
into Equation 2, then solve for Rupper:
Vbulk1 ? VBO
VBO
Vbulk1 ? Vbulk2
IBO (Vbulk1 ? VBO)
If we decide to turn on our converter for Vbulk1 equals
350 V, and turn it off for Vbulk2 equals 250 V, then we
obtain:
IBO = 28 m A
Rupper = 3.6 M W
Rlower = 10 k W
The bridge power dissipation is 400 2 /3.601 M W =
45 mW when the front ? end PFC stage delivers 400 V.
IBO = 83 m A
Rupper = 1.2 M W
Rlower = 3.4 k W
The bridge power dissipation is 132 mW when the
front ? end PFC stage delivers 400 V. Figure 46 simulation
result confirms our calculations.
Latch ? Off Protection
There are some situations where the converter shall be
fully turned off and stay latched. This can happen in
presence of an overvoltage (the feedback loop is drifting)
or when an overtemperature is detected. Due to the addition
of a comparator on the BO pin, a simple external circuit can
lift up this pin above VLATCH (5.0 V typical) and
permanently disable pulses. The V CC needs to be cycled
down below 5.0 V typically to reset the controller.
V CC
Vbulk
Q1
+
?
20 m s
RC
To permanent
latch
Vout
Rupper
+
Vlatch
I BO
Vdd
NTC
BO
Rlower
+
VBO
+
?
BO
Figure 47. Adding a comparator on the BO pin offers a way to latch ? off the controller.
In Figure 47, Q1 is blocked and does not bother the BO
measurement as long as the NTC and the optocoupler are
not activated. As soon as the secondary optocoupler senses
an OVP condition, or the NTC reacts to a high ambient
temperature, Q1 base is brought to ground and the BO pin
goes up, permanently latching off the controller.
http://onsemi.com
21
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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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