OB2365DMP

OB2365D High Performance Current Mode PWM Controller GENERAL DESCRIPTION FEATURES OB2365D is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications. At normal load condition, it operates in fixed frequency mode. When the loading goes low, it operates in PFM mode for high power conversion efficiency. When the load is very small, the IC operates in ‘Extended Burst Mode’ to minimize the standby power loss. As a result, high conversion efficiency can be achieved in the whole loading range. VCC low startup current and low operating current contribute to a reliable power on startup and low standby design with OB2365D. OB2365D offers comprehensive protection coverage with auto-recovery including Cycle-byCycle current limiting, VCC under voltage lockout (UVLO) and AC Brownout protection. It also provides the protections with latched shut down including VCC over voltage protection(OVP),over load protection (OLP), over temperature protection (OTP),output over voltage protection(OVP) and short protection(SCP). Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique. The tone energy at below 23KHz is minimized in the design and audio noise is eliminated during operation. OB2365D is offered in SOT23-6 package. ■ Power on soft start reducing MOSFET Vds stress Multi-Mode Operation 120K clamping frequency @Peak load in low line voltage 65KHz fixed frequency @ Heavy Load in low line voltage Burst Mode @ Light Load & No Load Frequency shuffling for EMI Extended burst mode control for improved efficiency and low standby power design Audio noise free operation Comprehensive protection coverage o VCC Under Voltage Lockout with hysteresis (UVLO) o VCC Over Voltage Protection (VCC OVP) with latch mode o Cycle-by-cycle over current threshold setting for constant output power limiting over universal input voltage range o Over Current Protection (OCP) with latch mode o Peak load Protection with latch mode o External Over Temperature Protection(OTP) with latch mode o Brownout protection with auto-recovery o Adjust Over Voltage Protection(OVP) through CS pin with latch mode o Output SCP Protection with latch mode o Output diode short protection with autorecovery 鼎 丰 ■ ■ 新 ■ ■ APPLICATIONS on fid en tia lt o ■ ht c Offline AC/DC flyback converter for ■ General power supply ■ Power Adapter rig TYPICAL APPLICATION EMI Filter DC Out O nB AC IN Vaux OB2365D GND GATE FB DEM ©On-Bright Electronics VCC CS Confidential -1- Preliminary Datasheet OB_DOC_DS_2365D02 OB2365D High Performance Current Mod PWM Controller GENERAL INFORMATION 6 Gate FB 2 5 VCC DEM 3 4 CS Ordering Information Part Number Description SOT23-6,Halogen-free OB2365DMP T&R 丰 1 Value 30V -0.7 to 7V -0.7 to 7V -0.7 to 7V -40 to 150 ℃ in -55 to 150 ℃ 新 GND Absolute Maximum Ratings Parameter VCC DC Supply Voltage FB Input Voltage CS Input Voltage DEM Input Voltage Min/Max Operating Junction Temperature TJ Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) 鼎 Pin Configuration Package Dissipation Rating Package RJA(℃/W) SOT23-6 200 260 ℃ en tia lt o Note: Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability. Recommended operating condition Symbol Parameter Range VCC VCC Supply Voltage 12 to 26V X on fid OB2365D Package Green Package M:SOT23-6 P:Green (Halogen-free) ht c Adaptive Multi-Mode PWM Controller X O nB rig Marking Information ©On-Bright Electronics 365YWW . ZZZDs Y:Year Code WW:Week Code(01-52) ZZZ: Lot code D: Character code s: Internal code Confidential -2- Preliminary Datasheet OB_DOC_DS_2365D02 OB2365D High Performance Current Mod PWM Controller TERMINAL ASSIGNMENTS I/O Description VCC P Power Supply CS I Current sense input. This pin is also connected to an auxiliary winding of the PWM transformer through a resistor and a diode for OVP/SCP protection. Gate O Totem-pole gate driver output for power MOSFET GND P Ground DEM I Multiple functions pin. Connecting a diode and a NTC resistor to ground for OTP detection. Connecting two resistors to AC(L or N Line) can adjust Brown-in/Brownout trigger voltage. FB I Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and the current-sense signal at Pin CS. O nB rig ht c on fid en tia lt o 新 鼎 丰 Pin Name ©On-Bright Electronics Confidential -3- Preliminary Datasheet OB_DOC_DS_2365D02 OB2365D High Performance Current Mod PWM Controller FUNCTIONAL BLOCK DIAGRAM S Logic Control Q Soft Driver GATE R EX OVP Timer Temp sense DEM EX OTP Vocp PWM Comparator Multi Mode Control Timer Brownout OTP OVP SCP EX OVP Peak load Peak Load LEB CS AVDD FB latch O nB rig ht c on fid OCP Slope compensation en tia lt GND BO OCP Comparator OCP Diode short 新 OSC EX OVP o Internal blocks Brownout VCC Diode short Peak load Vref& Iref AVDD Diode short UVLO SCP SCP 丰 OVP 鼎 OVP ©On-Bright Electronics Confidential -4- Preliminary Datasheet OB_DOC_DS_2365D02 OB2365D High Performance Current Mod PWM Controller ELECTRICAL CHARACTERISTICS Operation Current I_VCC_Burst Burst Current UVLO(ON) UVLO(OFF) Vpull-up VCC Under Voltage Lockout Enter VCC Under Voltage Lockout Exit (Recovery) Pull-up PMOS active en tia lt on fid ht c rig nB O Confidential -5- 2 uA 2 5 3 mA 0.3 0.5 mA 7.0 7.5 8.0 V 16 17 18 V 10 FB=3V, CS=0V. Slowly VCC Over Voltage Protection OVP ramp VCC, until no threshold voltage gate switching. Vlatch_release Latch release voltage Feedback Input Section(FB Pin) VFB_Open VFB Open Loop Voltage Avcs PWM input gain ΔVFB/ΔVCS Maximum duty Max duty cycle @ 75 cycle VCC=18V,VFB=3V,VCS=0V Vref_green The threshold enter green mode Vref_burst_H The threshold exits burst mode The threshold enters burst Vref_burst_L mode Short FB pin to GND IFB_Short FB pin short circuit current and measure current VTH_PK Peak load, threshold voltage Td_PK Peak load, debounce Time ZFB_IN Input Impedance Current Sense Input(CS Pin) SST_CS Soft start time for CS peak T_blanking Leading edge blanking time From Over Current Over Current Detection and Occurs till the Gate Td_OC Control Delay driver output start to turn off Internal Current Limiting VTH_OC Threshold Voltage with zero duty cycle VTH_OC_Clamp OCP CS voltage clamper Td_OCP OCP debounce time VTH_PK_CS_Clamp PK load CS voltage clamper VTH_OVP CS pin output OVP threshold TD_OVP Output OVP debounce time FB > Vref_burst_H VTH_cs_sample CS pin output voltage high/low ©On-Bright Electronics Unit 鼎 I_VCC_Operation VCC=UVLO(OFF)-1V, measure leakage current into VCC VDD=18V,CS=4V, FB=3.5V,measure I(VCC) CS=0V,FB=0.5V, measure I(VCC) Typ. Max 新 VCC Start up Current Min o Istartup Test Conditions 丰 (TA = 25℃, VCC=18V, unless otherwise noted) Symbol Parameter Supply Voltage (VDD) 28 V 29.5 V 5 V 5.1 3.3 V V/V 80 85 % 1.55 V V 1.45 V 0.16 mA 4.4 72 30 V ms KΩ 2.5 330 ms ns 80 ns 0.45 V 0.65 100 0.85 0.36 7 100 V ms V V cycle mV Preliminary Datasheet OB_DOC_DS_2365D02 OB2365D High Performance Current Mod PWM Controller threshold SCP threshold (Startup blanking 6mS) Output SCP debounce time FB > Vref_burst_H Toff CS pin sampling delay time TD_SCP TD_off_sample DEM pin Ibrown-in Ibrown-out Brown-in threshold current Brown-out threshold current Brown-out protection, Debounce Time Voltage threshold for adjustable output OTP External OTP debounce time Brownout and OTP detection clock Td_ otp Clk_dem 56 uA uA ms 0.80 0.85 0.90 en tia lt OTP exit Oscillator cycle uS 10.5 11.5 12.5 9 10 11 o In-chip OTP OTP enter 7 2.5 鼎 Vth_otp mV V 30 cycle 32 K 150 ℃ 120 ℃ 新 Td_BO 90 丰 VTH_scp Oscillation frequency in CCM VDD=15V,FB=3V, mode 65 KHz △f_OSC_nom Oscillation frequency jittering ±7 % Fosc_clamp_PK Clamp oscillation frequency in VDD=15V,FB=4.5V Peak load mode with 48%duty 120 KHz △f_OSC_clamp_PK Min clamp oscillation frequency jittering ±7 % 240 Hz 1 % 1 24 % KHz △f_Temp nB VOL rig △f_VCC F_Burst Gate driver VOH V_clamping O T_r T_f Shuffling frequency Frequency Temperature Stability Frequency Voltage Stability Burst Mode Switch Frequency ht c F_shuffling on fid Fosc_nom Output low level @ VDD=18V, Io=5mA Output high level @ VCC=18V, Io=20mA Output clamp voltage Output rising time 1.2V ~ 10.0V @ CL=2000pF Output falling time 10.0V ~ 1.2V @ CL=2000pF ©On-Bright Electronics Confidential 6 1 6 V V 11.5 V 250 ns 60 ns Preliminary Datasheet OB_DOC_DS_2365D02 OB2365D High Performance Current Mod PWM Controller CHARACTERIZATION PLOTS VDD = 18V, TA = 25℃ condition applies if not otherwise noted. UVLO(OFF)(V) vs Tem perature -10 20 50 80 丰 15.80 15.00 -40 110 140 -10 20 50 80 110 140 新 -40 19.00 18.20 17.40 16.60 鼎 8.00 7.80 7.60 7.40 7.20 7.00 UVLO(OFF)(V) UVLO(ON)(V) UVLO(ON)(V) vs Tem perature Temperature(℃) on fid en tia lt o Temperature(℃) -10 20 50 80 110 140 29.30 28.94 28.58 28.22 27.86 27.50 -40 Temperature(℃) -10 20 50 80 110 140 Temperature(℃) O nB -40 OVP(V) vs Tem perature OVP(V) ht c 0.500 0.480 0.460 0.440 0.420 0.400 rig Vth_ocp(V) Vth_ocp(V) vs Tem perature ©On-Bright Electronics Confidential 7 Preliminary Datasheet OB_DOC_DS_2365D02 OB2365D High Performance Current Mod PWM Controller OPERATION DESCRIPTION OB2365D is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications. The ‘extended burst mode’ control greatly reduces the standby power consumption and helps the design easier to meet the international power conservation requirements. decreasing of load results in voltage level decreasing at FB pin. The controller monitors the voltage level at FB and control the switching frequency. That is, when load decreases, In such way, a smooth frequency fold-back is realized and high power conversion efficiency is achieved. 丰 At no load or very light load conditions (VFB48% 120KHZ 23KHZ time Soft Start OB2365D features an internal 2.5ms (typical) soft start to soften the electrical stress occurring in the power supply during startup. It is activated during the power on sequence. As soon as VCC reaches UVLO(OFF), the CS peak voltage is gradually increased from 0.05V to the maximum level. Every restart up is followed by a soft start. rig VG1 VG2 VOCP VPK nB Two level OCP Controls In order to meet peak current output requirement, OB2365D sets up two levels OCP protection thresholds. The two thresholds correspond to the normal OCP protection and peak power protection respectively, and these two threshold values are internally compensated. When primary side inductor current exceeds the OCP threshold, OCP timer will begin counting. After 100ms (typical), OCP protection occurs. When primary side inductor current exceeds the peak power threshold, over peak power timer will begin counting. After 72ms (typical), peak load protection occurs. OCP and peak power protection are mutually independent and do not affect each. O Multi Mode Operation for High Efficiency OB2365D is a high performance current mode PWM controller. The controller changes the mode of operation according to line voltage and load conditions. At normal operating conditions (VG2