NCP1250是一款高度集成的
PWM控制器，能够在微型TSOP-6或PDIP-8封装中提供坚固耐用的高性能离线
电源。凭借高达28V的电源范围，该控制器拥有一个在峰值电流模式控制下运行的65kHz或100kHz抖动开关电路。当次级侧的功率开始下降时，控制器会自动将其开关频率折回至最低26kHz的水平。随着功率进一步下降，器件进入跳跃周期，同时限制峰值电流。过功率保护(OPP)是一项艰巨的任务，尤其是当空载待机要求驱动转换器规格时。ON专有的集成OPP让您只需通过两个外部电阻器即可在不影响待机性能的情况下利用最大输出功率。过压保护输入也组合在同一引脚上，并在光耦合器故障或不利的开环操作的情况下保护整个电路。最后，基于定时器的短路保护提供最佳保护方案，让您精确选择保护跳闸点与辅助绕组和电源绕组之间的松散耦合无关。
特征
•固定频率65或100kHz电流模式控制操作
•内部可调过功率保护(OPP)电路
•频率折返至26kHz和轻负载条件下的跳周期
•内部斜坡补偿
•内部固定4ms软启动
•100ms基于定时器的自动恢复短路保护
•正常和频率折返模式下的频率抖动
•自动恢复或锁存短路保护选项
•
OVP输入以提高稳健性
•高达28V的VCC操作
•+300mA/−500mA拉电流/灌电流驱动能力
•高压线下的待机功率小于100mW
•符合EPS2.0
典型应用示例 (TSOP-6)
内部电路体系结构：
最高额定值
| Symbol | Rating | Value | Unit |
| VCC | power Supply voltage, Vcc pin, continuous voltage | 28 | V |
| VDRVtran | Maximum DRV pin voltage when DRV in H state, transient voltage (Note 1) | Vcc + 0.3 | V |
| Maximum voltage on low power pins CS, FB and OPP | -0.3 to 10 | V |
| IOPP | Maximum injected negative current into the OPP pin | -2 | mA |
| ISCR | Maximum continuous current in to the Vcc Pin while in latched mode | 3 | mA |
| RθJA | Thermal Resistance Junction-to-Air | 360 | °C/W |
| Tj,max | Maximum Junction Temperature | 150 | °C |
| Storage Temperature Range | -60 to+150 | °C |
| ESD Capability, Human Body Model (HBM), all pins | 2 | kV |
| ESD Capability, Machine Model (MM) | 200 | V |
| ESD Capability, Charged device Model (CDM) | 1 | kV |
电气特性
（典型值TJ=25°C，最小值/最大值TJ=−40°C至+125°C，最大值TJ=150°C，VCC=12V，除非另有说明）
| Symbol | Rating | Min | Typ | Max | Unit |
| SUPPLY SECTION - (For the best efficiency performance, we recommend a Vcc below 20 V) |
| VCCon | Vcc increasing level at which driving pulses are authorized | 16 | 18 | 20 | V |
| VCC(min) | Vcc decreasing level at which driving pulses are stopped | 8.2 | 8.8 | 9.4 | V |
| VCChyst | Hysteresis VCCON − VCC(min) | 6.0 | | | V |
| VZENER | Clamped Vcc when latched off / burst mode activation @ Ice = 500 μA | | 7.0 | | V |
| ICC1 | start-up current | | | 15 | μA |
| ICC2 | Internal IC consumption with Ifb = 50 μA, Fsw = 65 kHz and Cl = 0 nF | | 1.4 | 2.2 | mA |
| ICC3 | Internal IC consumption with lFB = 50 μA, Fsw = 65 kHz and CL = 1 nF | | 2.1 | 3.0 | mA |
| ICC2 | Internal IC consumption with Ifb = 50 μA, Fsw = 100 kHz and Cl = 0 nF | | 1.7 | 2.5 | mA |
| ICC3 | Internal IC consumption with IFB = 50 μA, FSW = 100 kHz and CL = 1 nF | | 3.1 | 4.0 | mA |
| ICClatCH | Current flowing into Vcc Pin that keeps the controller latched (Note 4) Tj = -40°C to+125°C Tj = 0°Cto+125°C | 40 32 | | | μA |
| ICCstby | Internal IC consumption while in skip cycle (Vcc = 12 V, driving a typical 6 A/600 V MOS-FET) | | 550 | | μA |
| Rlim | Current-limit resistor in series with the latch SCR | | 4.0 | | kΩ |
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NCP1250-D.PDF
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发表于 2022-6-1 10:17
