NCP1395适用于LLC半桥谐振的PFM控制芯片.pdf

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NCP1395适用于LLC半桥谐振的PFM控制芯片,重点翻译中文资料,PDF版本。 • 频率范围宽: 高速电压控制振荡器允许A,B输出频 率从50 kHz到1.0 MHz。 • 可调死区: 可以通过连接一个到地电阻设置死区时 间,防止上下晶体管同时导通. • 可调软启动: 每当控制器开始工作(接通电源),开关 频率就会被推到电路设计的最大值,并缓慢地向下 移动到最小频率,直到反馈回路闭合。 软启动程序 在以下情况下被激活:a)正常启动b)从关闭状态返回 运行:在打嗝故障模式、掉电检测(brown out)或热 关机(TSD)期间。在NCP1395A中,除非反馈引脚电 压达
NCP1395A/B PIN FUNCTION DESCRIPTION Pin no Symbol Function Description Fmin Timing Resistor Connecting a resistor to this pin, sets the minimum oscillator frequency reached for vFb is below 1.3V Fmax Frequency Clamp A resistor sets the maximum frequency excursion 2345 DT Deadtime A simple resistor adjusts the deadtime length Soft-Start Select the soft-start duration FB Feedback Apply ing a voltage above 1.3V on this pin increases the oscillation frequency up to Fmax Ctime Timer Duration Sets the timer duration in presence of a fault BO Brown -Out掉电检测检测输入电压(低电压有效)。当电压大于电压锁存器 Latch)时,它完 全锁住控制器 Aand Analog Ground 9 Pand Power Ground A Low Side Output Drives the low side power MOSFET High Side Output Drives the upper side power MOSFEL. Supplies the Controller Fast Fault Quick Fault Detection Fast shutdown pin, stops all pulses when brought high. Please look in the description for more details about the fast-fault sequence Slow Fault Slow fault detection When asserted the timer starts to countdown and shuts down the controller at he end of its time duration 15 OUT OPAMP Output Internal transconductance amplifier. 16 NINV OPAMP Noninverting Non-inverting pin of the OPAMP. http:/lonsemi.cor NCP1395A/B Vdd ○ NINV D Vref Clk Q R越小F越高Fmin IDT DT Adj 50%DC FB电压越高F越高 I= Imax for vtb=5 v I=0 for vfb c Vfb off Reset 高电平有效 Vib =5 03O 过载 R越小F越高 FmaX口 仅E版本有重置 软启动 If fAULT Itimer clsc 0 高电平闭合 FAULTS4VCTimer D 1 Timeout 1V O Vref 1.CV FAULT=高电 PC Fault 开机复位,故障, 重置SS, Timer VLO Fault 电压电流∠ 应y-36V FAULT<O6V FB >only if V(FB)>Vfb_off Vdd 1.3v-6V控制频率 RE AULT=高电平 O Vfb_fault 0.6V 3V 输入过压 异常过流 /复 59V复位 噪声 4.1V AGNDOI Figure 2. Internal Circuit Architecture http:/onsemi.cor NCP1395A/B MAXIMUM RATINGS Rating ymbo Value Unit Power Supply Voltage, Pin 12 CC V Transient Current Injected into Vcc when Internal Zener is Activated 10 mA Pulse width< 10 ms Power Supply Voltage, All Pins(Except Pins 10 and 11) 0.3to10 V Thermal Resistance. Junction -to-Air PdiP version AJA TBD cC/ Thermal Resistance. Junction -to-Air soIC Version TBD CC/ Storage Temperature Range 60to+150 ESD Capability, HBM Model (All Pins EXcept Vcc and HV) kV ESD Capability, Machine Model 200 Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability 1. This device series contains ESD protection and exceeds the following tests Human Body Model 2000 V per Mil-Std-883, Method 3015 Machine model method 200 V 2. This device contains latch-up protection and exceeds 100 mA per JEDEC Standard JESD78 http:/onsemi.com NCP1395A/B ELECTRICAL CHARACTERISTICS (For typical values T=25 C, for min/max values T=0C to+125C, Max TJ=150C, Voc =11 V, unless otherwise noted. Characteristic Pin Symbol MinTypMaxUnit SUPPLY SECTION 开机电压, Vcc Going Up- A Version 12 VCOn 12.3 13.3 14.3 Turn-On Threshold Level, Vcc Going Up-B Version 12 VCOn 9.3 103113 开机后的最低工作电压 12 VCC(min) 8.3 9310.3 VCCON and vccimir)之间的最小后 A Version 12 VhysteA 0 Minimum Hysteresis between VccoN and vCC(min)-B Version 12 VhysteB 1.0 VVVVVA Startup Current, VCC VCCoN 12 Startup 300 内部逻辑被重置的Vcc电压 12 VCCreset 5.9 nterna||C消耗,没有输出负载 on Pins11/12,FsW=300kHz 12 ICC1 1.6 mA nternal IC consumption,100pF负载输出 on pIn11/12,FsW=300kHz 12 ICC2 2.3 mA 故障模式消耗(Aldrⅳ ers disabled vcc>Vccm) 12 ICC3 1.3 mA 压控振荡器(cO Minimum Switching Frequency, Rt= 120 kS on Pin 1, Vpin 5=0V, Fsw min 48.5 51.5 k上 DT=300 ns Maximum Switching Frequency, Rfmax =22 ks on Pin 2, Vpin 5> Fsw max 0.9 1.0 1.11 MHZ 6.0V,DT=300ns-=25"C(Note 3) Feedback Pin Swing above which Af=0 5 FBSW 6.0 VCO Vcc Rejection, AVcc=1.0 V, in Percentage of Fsw PSRR 0.2 %/ Operating Duty Cycle 11-10 DC 48 50 52 所存乔的参考电压DTp VREF 1.86 2.0 2.14 任何驱动程序在故障模式下重启前的延迟 Tdel FEEDBACK SECTION Internal pulldown resistor 5 Rtb ks OTA Internal offset Voltage 16 VREF FB2.3252.52.675V Voltage on Pin 5 below which the FB Level has no Vco Action 5 Vfb off Voltage on Pin 5 below which the Controller Considers a Fault 5 Vfb fault 0.6 Input Bias current 16 Bⅰas 100 nA DC Transconductance gain 15 OTAG 250 Gain Product bandwidth rload=5.0 ko 15 GBW 1.0 MHz DRIVE OUTPUT Output Voltage Rise Time CL =100 pF, 10-90% of Output Signal 11-10 T ns Output Voltage Fall-Time@ CL=100 pF, 10-90% of Output Signal 11-10 ns Source Resistance 11-10 H 20 120 Sink resistance 11-10 R 130 Deadtime with Rot =127 kQ2 from Pin 3 to GND t dead 270 300 390 ns Maximum Deadtime with RoT 540 kQ2 from Pin 3 to GND 333 T dead-max LLS Minimum Deadtime, Rdt =30 kQ from Pin 3 to GND t dead-min 150 ns 3. Room temperature only, please look at characterization data for evolution versus junction temperature http:/lonsemi.cor NCP1395A/B ELECTRICAL CHARACTERISTICS(continued)(For typical values T]=25C, for min/max values T=0C to+1250C, Max T=150C, Vcc =11 v, unless oth erwise noted Characteristic Pin Symbol Mir TypMaxUnit TIMERS Timer Charge Current Itimer 150 Timer Duration with a 1.0 uF Capacitor and a 1.0 MQ2 Resistor Timer recurrence in permanent Fault. same values as above 66666 T-timer 25 山寸 s T-timerR 1.4 s Voltage at which Pin 6 Stops Output Pulses VtimeroN 3.7 4.1 4.5 V Voltage at which Pin 6 Restarts Output Pulses VtimerOFF 0.9 0 1.1 V Soft-Start Ending Voltage, VFB=1.0V VSS 2.0 Soft-Start Charge Current ISS 115 LA Note 5 Soft-Start Duration with a 220 nF Capacitor(Note 4) T-SS 50 ms 保护 快速输入的参考电压 13 Vreffaulth 1.0 1.05 1.1 慢速輸入的参考电压 14 VrefFaults098 1.03 1.08 V Hysteresis for Fast Input 13 HysteFaultF 50 mv Hysteresis for Slow Input 14 HysteFaults 40 mv Propagation Delay for Fast Fault Input Drive Shutdown 13 TpFault 70 120 n Brown-out Input Bias current TObias 0.02 A Brown-Out Level 77777 VBO 0.981.031.08V Hysteresis Current vpin 7> VBo-A Version IBO A 23 28 33 A Hysteresis Current Vpin 7> VB0-B Version ibO B 83 96 A Latching∨ oltage Latch 3.7 4.1 4.5 Temperature Shutdown TSD 140 C Hysteresis TSDhyste 40 C 4. The A version does not activate soft-start when the fast-fault is released, this is for skip cycle implementation. The B version does activate the soft-start upon release of the fast-fault input 5. Minimum current occurs at TJ=0 http:/onsemi.cor NCP1395A/B TYPICAL CHARACTERISTICS-A VERSION 13.5 13.4 9.8 13.3 9.6 uOO 13.2 uO 94 13.1 9.2 13.0 9.0 40-20020406080100120140 -40-20020406080100120140 TEMPERATURE C) TEMPERATURE (C) Figure 3. VCOn A Figure 4. VCCmin 50 1.1 495 0 工>OzuGuY NE z49 09 48.5 0.8 0.7 40-20020406080100120140 40-20020406080100120140 TEMPERATURE C) TEMPERATURE (C) Figure 5. Fsw min Figure 6. Fsw max 2.70 2.65 c20 2.55 19 18 250 40-20020406080100120140 0-20020406080100120140 TEMPERATURE C) TEMPERATURE(C) Figure 8. Pulldown Resistor(RFB) Figure 7. Reference(Vref FB) http:/onsemi.com NCP1395A/B TYPICAL CHARACTERISTICS-A VERSION 100 110 100 90 90 C工O 70 70 40 -40-20020406080100120140 40-20020406080100120140 TEMPERATURE(C TEMPERATURE ('C) Figure 9. Source Resistance(ROH) Figure 10. Sink Resistance(ROL 250 350 230 330 320 150 310 130 40-20020406080100120140 0-20020406080100120140 TEMPERATURE(C) TEMPERATURE(°C) Figure 11. t dead min A Figure 12. T_dead_ A 1300 1.10 1200 1100 1.06 1000 900 800 1.02 700 1.00 40-20020406080100120140 40-20020406080100120140 TEMPERATURE (C) TEMPERATURE (C) Figure 14.T dead max A Figure 13. Fast Fault(VrefFault FF) http:/onsemi.com NCP1395A/B TYPICAL CHARACTERISTICS-A VERSION 1.04 29 1.035 27 1.025 25 -40-20020406080100120140 40-20020406080100120140 TEMPERATURE(C TEMPERATURE (C) Figure 15. Brown-Out Reference(VBO) igure 16 Brown-Out Hysteresis Current (1BO) 4.2 4.15 石4.1 4.05 4.0 40-20020406080100120140 TEMPERATURE (C) Figure 17 Latch Level (Latch) http:/onsemi.com 10

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