参数资料
| 型号： | NCP1397ADR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/27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页第13页第14页第15页第16页第17页第18页第19页当前第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 CC
Vbulk
Q1
+
?
20 m s
RC
To permanent
latch
Vout
Rupper
+
V latch
IBO
V DD
NTC
BO
Rlower
+
VBO
+
?
BO
Figure 42. Adding a Comparator on the BO Pin Offers a way to Latch ? off the Controller
On Figure 42, 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.
Protection Circuitry
This resonant controller offers a dedicated input (Fault
input) to detect primary overcurrent conditions and protect
power stage from damage.
Once the voltage on the Fault input exceeds 1.04 V
threshold the external timer capacitor starts charging by
I timer1 current. Simultaneously the Soft ? Start discharge
switch is activated to shift operating frequency up to keep
primary current at acceptable level. In case the overload
disappears fast enough the Soft ? Start discharge switch is
open, I timer1 current turned ? off and timer capacitor
discharges via an external parallel resistor. In case the
overload lasts for more than timer duration (given by I timer ,
V timer , C timer and R timer ) the IC stops the operation and waits
until the C timer will discharge to 1 V. The application then
restarts via Soft ? Start.
In case of heavy overload, like transformer short circuit,
the primary current grows very fast and thus could reach
danger level prior the fault timer elapses. The NCP1397B
therefore features additional comparator (1.55 V) on the
Fault input to permanently latch the application and protect
against destruction. Figure 44 depicts the architecture of the
fault circuitry for NCP1397B controller.
The NCP1397A features second fault comparator as well
but in this case it doesn’t latches off the IC but speeds up the
Fault timer capacitor charging by turning on additional
current source I timer2 – refer to Figure 43. The NCP1397A
can thus be used in applications that have to recover
automatically from any fault conditions.
http://onsemi.com
20
相关PDF资料 |
PDF描述 |
|---|---|
| NCP1417DMR2 | IC REG BST SYNC ADJ 0.2A 8MICRO |
| NCP1421DMR2 | IC REG BST SYNC ADJ 0.6A 8MICRO |
| NCP1450ASN50T1G | IC REG CTRLR BST PWM VM 5TSOP |
| NCP1521BMUTBG | IC REG BUCK SYNC ADJ 0.6A 6UDFN |
| NCP1522ASNT1G | IC REG BUCK SYNC ADJ 0.6A 5TSOP |
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 |
发布紧急采购，3分钟左右您将得到回复。