DP2366

DP2366 Highly Integrated Offline Current Mode PWM Power Switch FEATURES GENERAL DESCRIPTION  Integrated with 650V Power MOSFET  ±1% CV Regulation  Less than 75mW Standby Power  Fixed 65KHz Switching Frequency  Green Mode and Burst Mode Control Very Low Startup and Operation Current In DP2366, PWM switching frequency with shuffling is fixed to 65KHz and is trimmed to tight  Built-in Frequency Shuffling to Reduce EMI range. The IC has built-in green and burst mode control for light and zero loadings, which can  Built-in Current Mode Control Internal Slope Compensation achieve less than 75mW standby power.  Built-in Protections with Auto Recovery: DP2366 integrates functions and protections of   VDD Under Voltage Lockout (UVLO) VDD Over Voltage Protection (OVP) Under Voltage Lockout (UVLO), VDD over Voltage Protection (VDD OVP), Cycle-by-cycle   On-Chip Thermal Shutdown (OTP) Cycle-by-Cycle Current Limiting Current Limiting (OCP), Over Load Protection   Over Load Protection (OLP) CS Pin Float Protection   DP2366 is a high performance current mode PWM power switch for offline flyback converter applications. with (OLP), On-Chip Thermal Shutdown (OTP), Soft Start, VDD Clamping and CS Pin Float Protection, etc. Available with DIP-7/DIP-8 Package APPLICATIONS   Power Adapter General Switch Mode Power Supply TYPICAL APPLICATION CIRCUIT DP2366_REV1.1_EN www.depuw.com 1 DP2366 Highly Integrated Offline Current Mode PWM Power Switch Pin Configuration DIP-7 DIP-8 Marking Information DIP7/DIP8 DP2366 for product name; XXXXXX The first X represents the last year,2014 is 4; The second X represents the month, in AL 12 letters;The third and fourth X on behalf of the date, 01-31 said; The last two X represents the wafer batch code. Pin Description （1）DIP-7/DIP-8: Pin Number Pin Number I/O 1 NA -- Un-connection Pin. Left float in the practical design 2 VDD P 3 FB I 4 CS I IC power supply pin Feedback pin. The loop regulation is achieved by connecting a photo-coupler to this pin. PWM duty cycle is determined by this pin voltage and the current sense signal at Pin 4 Current Sense Input Pin 5,6 Drain O The Power MOSFET Drain 7,（8） GND P The Ground of the IC DP2366_REV1.1_EN Description www.depuw.com 2 DP2366 Highly Integrated Offline Current Mode PWM Power Switch Ordering Information Part Number Description DP2366 DIP-7/DIP8, Pb free, 50Pcs/Tube Block Diagram Drain Green & Burst Control FB_int 65KHz Oscillator with Frequency Shuffling S Q Voltage & Current Reference VDD PWM Soft Gate Driver Power MOSFET R Regulator 5V VDD OVP 31V VDD OVP UVLO 21V/9V Fault Management Soft Start 32V POR FB_int LEB 5V Thermal Shutdown Slope Compensation OTP CS 20K FB_int FB 3.6V 75ms Delay OLP OLP GND DP2366_REV1.1_EN www.depuw.com 3 DP2366 Highly Integrated Offline Current Mode PWM Power Switch Absolute Maximum Ratings (Note 1) Parameter Value Unit VDD DC Supply Voltage 30 V VDD DC Clamp Current 10 mA -0.3 to 650 V -0.3 to 7 V Package Thermal Resistance---Junction to Ambient(DIP-7) 105 °C/W Maximum Junction Temperature 175 °C -65 to 150 °C 260 °C 4 kV 500 V Value Unit Supply Voltage, VDD 10 to 26 V Operating Ambient Temperature -40 to 85 °C Drain Pin FB, CS Voltage Range Storage Temperature Range Lead Temperature (Soldering, 10sec.) ESD Capability, HBM (Human Body Model) ESD Capability, MM (Machine Model) Recommended Operation Conditions (Note 2) Parameter Electrical Characteristics (Ta = 25°C, VIN=12V, if not otherwise noted) Symbol Parameter Test Conditions Min Typ. Max Unit 2 20 uA 1.2 2 mA 0.6 1 mA 19 21 21.5 V 8 9 10 V 29 31 33 V 33 35 37 V Supply Voltage Section(VDD Pin) IVDD_st Start-up current into VDD pin IVDD_Op Operation Current IVDD_standby Standby Current VDD_OFF VDD Under Voltage Lockout Exit VDD Under Voltage Lockout Enter VDD_OVP VDD OVP Threshold VDD_Clamp VDD Zener Clamp Voltage VDD_ON VFB=3V I(VDD )=7 mA Feedback Input Section (FB Pin) VFB_Open FB Open Voltage IFB_Short FB Short Circuit Current ZFB_IN FB Input Impedance ACS PWM Gain DP2366_REV1.1_EN Short FB Pin to GND, Measure Current ΔVFB/ΔVCS www.depuw.com 5.9 V 0.3 mA 20 KΩ 2.0 V/V 4 DP2366 Highly Integrated Offline Current Mode PWM Power Switch Vskip VTH_OLP TD_OLP FB Under Voltage PWM Clock is OFF Power Limiting FB Threshold Voltage Power Limiting Debounce Time SEL Pin is floating 1.0 V 3.6 V 75 ms 250 ns Current Sense Input Section (CS Pin) TLEB CS Input Leading Blanking Time Edge Vcs(max) Current limiting threshold TD_OC Over Current Detection and Control Delay 0.97 1.0 1.03 70 V ns Oscillator Section FOSC Normal Frequency Oscillation ΔF(shuffle) /FOSC Frequency Shuffling Range T(shuffle) Frequency Shuffling Period DMAX Maximum Cycle Switching FBust Burst Mode Base Frequency 60 65 -4 Duty 70 KHz 4 % 32 ms 66.7 % 22 KHz On-Chip Thermal Shutdown TSD Thermal Shutdown (Note 3) TRC Thermal Recovery (Note 3) --- 165 -- °C 140 -- °C Power MOSFET Section (Drain Pin) VBR Rdson Power MOSFET Drain Source Breakdown Voltage Static Drain-Source On Resistance 650 V 1.9 2.5 Ω Note1. Stresses listed as the above "Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to maximum rating conditions for extended periods may remain possibility to affect device reliability. Note2. The device is not guaranteed to function outside its operating conditions. Note3. Guaranteed by the Design. DP2366_REV1.1_EN www.depuw.com 5 DP2366 Highly Integrated Offline Current Mode PWM Power Switch Characterization Plots VDD_OFF vs Temperature 10.2 21.6 9.8 VDD_OFF(V) VDD_ON(V) VDD_ON vs Temperature 22 21.2 20.8 20.4 20 -40 -20 0 20 40 60 Temperature( 80 100 9.4 9 8.6 8.2 -40 120 -20 FOSC vs Temperature VCC_Reg_SEL(mV) FOSC(kHz) 60 80 100 120 100 120 100 120 ) VCC_Reg_SEL vs Temperature 68 66 64 -20 0 20 40 60 Temperature( 80 100 204 202 200 198 196 -40 120 -20 0 ) 20 40 60 Temperature( IVDD_st vs Temperature 80 ) VCS(max) vs Temperature 3 1.04 2.5 1.03 VCS(max)(V) IVDD_st(uA) 40 206 70 2 1.5 1 0.5 -40 20 Temperature( 72 62 -40 0 ) 1.02 1.01 1 0.99 -20 0 20 40 60 Temperature( DP2366_REV1.1_EN 80 100 120 0.98 -40 ) -20 0 20 40 60 Temperature( www.depuw.com 80 ) 6 DP2366 Highly Integrated Offline Current Mode PWM Power Switch Operation Description DP2366 is a high performance current mode system EMI performance, DP2366 operates the PWM power switch for offline flyback converter, motor driver power supply, and adapter system with 4% frequency shuffling around setting frequency. applications.   System Start-Up Operation and IC Operation Current Before the IC starts to work, it consumes only startup current (typically 2uA) which allows a large value startup resistor to be used to minimize the power loss and the current flowing through the startup resistor charges the VDD hold-up capacitor from the high voltage DC bus. When VDD reaches turn on threshold VDD_ON (typical Green Mode Operation Since the main power dissipation at light/zero load in a switching mode power supply is from the switching loss which is proportional to the PWM switching frequency. To meet green mode requirement, it is necessary to reduce the switching cycles under such conditions either by skipping some switching pulses or by reducing the switching frequency. 21V), DP2366 begins switching and the IC operation current is increased to be 1mA (typical). Smooth Frequency Foldback The hold-up capacitor continues to supply VDD before the auxiliary winding of the transformer In DP2366, a Proprietary “Smooth Frequency takes the control of VDD voltage. When the IC Foldback” function is integrated to foldback the PWM switching frequency when the loading is enters into burst mode, the IC operation current will decrease further, thus less than 75mW light. Compared to the other frequency reduction implementations, this technique can reduce the standby power. PWM frequency smoothly without audible noise. Fig.2 Burst Mode Control Fig.1  When the loading is very small, the system enters into burst mode. When VFB drops below Vskip, Oscillator with Frequency Shuffling DP2366 will stop switching and output voltage PWM switching frequency in DP2366 is fixed to 65KHz and is trimmed to tight range. To improve DP2366_REV1.1_EN starts to drop (as shown in Fig.3), which causes the VFB to rise. Once VFB rises above Vskip, switching resumes. Burst mode control alternately www.depuw.com 7 DP2366 Highly Integrated Offline Current Mode PWM Power Switch enables and disables switching, thereby reducing switching loss in standby mode.  Soft Start DP2366 features an internal 2ms (typical) soft start that slowly increases the threshold of cycleby-cycle current limiting comparator during startup sequence. It helps to prevent transformer saturation and reduce the stress on the secondary diode during startup. Every restart attempt is followed by a soft start activation.  Constant Power Limiting A proprietary “Constant Power Limiting” block is integrated to achieve constant maximum output power capability over universal AC input range. Fig.3  Based on the duty cycle information, the IC generates OCP threshold according to a Built-in Slope Compensation proprietary analog algorithm. In the conventional application, the problem of the  Over Load Protection (OLP) stability is a critical issue for current mode controlling, when it operates in higher than 50% of the duty-cycle. In DP2366 the slope compensation If over load occurs, a fault is detected. If this fault is present for more than 75ms (typical), the circuit is integrated by adding voltage ramp onto the current sense input voltage for PWM protection will be triggered, the IC will experience an auto-recovery mode protection as mentioned generation. This greatly improves the close loop stability at CCM and prevents the sub-harmonic above. The 75ms delay time is to prevent the oscillation and thus reduces the output ripple false trigger from the power-on and turn-off transient. voltage.   Leading Edge Blanking (LEB) Each time the power MOSFET is switched on, a turn-on spike occurs across the sensing resistor. The spike is caused by primary side capacitance and secondary side rectifier reverse recovery. To avoid premature termination of the switching pulse, an internal leading edge blanking circuit is built in. During this blanking period (250ns, typical), the PWM comparator is disabled and cannot switch off the gate driver.  When VDD voltage is higher than 31V (typical), the IC will stop switching. This will cause VDD fall down to be lower than VDD_OFF (typical 9V) and then the system will restart up again. An internal 35V (typical) zener clamp is integrated to prevent the IC from damage.  CS Pin Float Protection When VDD voltage is higher than VDD_ON (21V typical), IC firstly starts to check whether CS pin is On Chip Thermal Shutdown (OTP) o When the IC temperature is over 165 C, the IC shuts down. Only when the IC temperature drops o to 140 C, IC will restart. DP2366_REV1.1_EN VDD Over Voltage Protection (OVP) and Zener Clamp floated. If CS pin is floated, switching is blocked and IC enters auto-recovery mode; otherwise, normal work begins. With this protection, system stability is enhanced. www.depuw.com 8 DP2366 Highly Integrated Offline Current Mode PWM Power Switch  Auto Recovery Mode Protection clamp is added for power MOSFET protection when high VDD input. gate As shown in Fig.4, once a fault condition is detected, PWM switching will stop. This will cause VDD to fall because no power is delivered form the auxiliary winding. When VDD falls to VDD_OFF (typical 9V), the protection is reset and the operating current reduces to the startup current, which causes VDD to rise. The system begins switching when VDD reaches to VDD_ON (typical 21V). However, if the fault still exists, the system will experience the above mentioned process. If the fault has gone, the system resumes normal operation. In this manner, the auto restart can alternatively enable and disable the switching until the fault condition is disappeared. Fig.4  Soft Totem-Pole Gate Driver DP2366 has a soft totem-pole gate driver with optimized EMI performance. An internal gate DP2366_REV1.1_EN www.depuw.com 9 DP2366 Highly Integrated Offline Current Mode PWM Power Switch Package Dimension DIP-7 Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 3.710 4.310 0.146 0.170 A1 0.510 A2 3.200 3.600 0.126 0.142 B 0.380 0.570 0.015 0.022 B1 0.020 1.524(BSC) 0.060(BSC) C 0.204 0.360 0.008 0.014 D 9.000 9.400 0.354 0.370 E 6.200 6.600 0.244 0.260 E1 7.320 7.920 0.288 0.312 e 2.540(BSC) 0.100(BSC) L 3.000 3.600 0.118 0.142 E2 8.400 9.000 0.331 0.354 DP2366_REV1.1_EN www.depuw.com 10 DP2366 Highly Integrated Offline Current Mode PWM Power Switch E L A1 A A2 Package Dimension Symbol A A1 A2 B B1 C D E E1 e L E2 DP2366_REV1.1_EN Dimensions In Millimeters Min Max 3.710 5.334 0.381 3.175 3.600 0.350 0.650 1.524 (BSC) 0.200 0.360 9.000 10.160 6.200 6.600 7.320 7.920 2.540 (BSC) 2.921 3.810 8.200 9.525 www.depuw.com Dimensions In Inches Min Max 0.146 0.210 0.015 0.125 0.142 0.014 0.026 0.06 (BSC) 0.008 0.014 0.354 0.400 0.244 0.260 0.288 0.312 0.1 (BSC) 0.115 0.150 0.323 0.375 11