OB2222MCP

OB2222M High Precision Low Cost Power Switch GENERAL DESCRIPTION FEATURES OB2222M is a high performance, high precision and low cost PWM Power switch for non-isolated buck and buck-boost application. It combines a dedicated current mode PWM controller with a high voltage power Bipolar in SOP8 package. Its built-in error amplifier is optimized for good overshoot and dynamic response for low cost and component count. With precise inner resistor divider, precise reference of EA ， constant voltage regulation of 5.0V at universal AC input can be guaranteed. Frequency reduction and burst mode control is implemented for high efficiency at light load. Good EMI performance is achieved with On-Bright proprietary frequency shuffling technique and soft base driver design. Low startup current and low operating current contribute to a reliable power on startup and low standby power consumption with OB2222M. Constant power operation is supported at over load application with OB2222M, which makes it suitable for small home appliance application where instant large power consumption is required such as start-up of a fan. OB2222M offers power on soft start control and protection coverage with auto-recovery features including cycle-by-cycle current limiting, output short circuit protection, FB pin open loop protection, on-chip Over Temperature Protection (OTP), VDD Over Voltage Protection (OVP), and VDD Under Voltage Lockout Protection (UVLO). The tone energy at below 20KHz is minimized in the design so that audio noise is eliminated during operation. OB2222M is offered in SOP8 package.  子 en tia lt          可 电    赛  o  Universal AC input range and 5.0V output voltage Constant power mode operation at over load application Low cost and less BOM for buck and buckboost applications Current mode control 40kHz (typical) maximum switching frequency Frequency-reduction and burst mode control for high efficiency Frequency shuffling for EMI improvement Power on soft-start Built-in Leading Edge Blanking (LEB) Cycle-by-cycle current limiting FB pin open loop protection Output short-circuit protection VDD Under Voltage Lockout with Hysteresis VDD OVP On-Chip OTP APPLICATIONS co nf id Low power AC/DC offline SMPS for  Small home appliance  Linear regulator/RCC replacement O nb rig ht TYPICAL APPLICATION ©On-Bright Electronics Confidential -1- Preliminary Datasheet OB_DOC_DS_2222M02 OB2222M High Precision Low Cost Power Switch Output Power Table Topology Pin Configuration The pin map is shown as below for SOP8 1 8 C GND 2 7 C Absolute Maximum Ratings Parameter C-B Voltage VDD Voltage FB Voltage CS Input Voltage Min/Max Operating Junction Temperature TJ Operating Ambient Temperature TA Min/Max Storage Temperature Tstg Lead Temperature (Soldering, 10secs) Note: Stresses beyond those 6 C CS 4 5 C o 3 赛 SOP VDD Value 700V -0.3 to 20V -0.3 to 20V -0.3 to 7V 可 电 FB Buck/Buck-Boost 90~264Vac Input (open frame) 300mA 子 GENERAL INFORMATION Ordering Information Part Number Description OB2222MCP SOP8, Pb-free, Tube OB2222MCPA SOP8, Pb-free, T&R -40 to 150 ℃ -40 to 85 ℃ -55 to 150 ℃ 260 ℃ en tia lt 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. Package Dissipation Rating Package RθJA (℃/W) SOP8 90 Note: Drain Pin Connected 100mm2 PCB copper clad. O nb rig ht co nf id Recommended Operating Condition Symbol Parameter Range VDD VDD Supply Voltage 4.5 to 6V ©On-Bright Electronics Confidential 2 Preliminary Datasheet OB_DOC_DS_2222M02 OB2222M High Precision Low Cost Power Switch TERMINAL ASSIGNMENTS Pin Name I/O 1 FB I 2 3 4 5/6/7/8 GND VDD CS C P P I O Description Output Voltage Feedback. This pin should connect a capacitor to ground. Ground Power Supply Current sense input Power bipolar collector pins. O nb rig ht co nf id Pin Num en tia lt o 赛 可 电 子 Marking Information ©On-Bright Electronics Confidential -3- Preliminary Datasheet OB_DOC_DS_2222M02 OB2222M High Precision Low Cost Power Switch BLOCK DIAGRAM C VDD LDO UVLO 子 Base Driver AVDD POR LEB OTP PWM Generate Logic core FB OSC PWM o Frequency Shuffling COMP en tia lt R1 CS 赛 R2 EA OCP SCP Open Loop Vref 可 电 OVP GND O nb rig ht co nf id AVDD ©On-Bright Electronics Confidential -4- Preliminary Datasheet OB_DOC_DS_2222M02 OB2222M High Precision Low Cost Power Switch ELECTRICAL CHARACTERISTICS (TA = 25℃, VDD=5.5V, if not otherwise noted) Symbol Parameter Supply Voltage (VDD) Section I_startup Startup Current VDD Under Voltage Lockout Enter Over voltage protection Threshold en tia lt co nf id 5.15 50 0.6 0.7 0.9 1.0 16 V V 100 ns 0.8 V 1.1 V ht 36 40 44 KHz +/-8 % 78 Hz 7 11 15 % 20 KHz 450 Collector-base breakdown voltage Collect Peak Current Ic=10mA 700 90 3 mA mA 0.515 V 125 ℃ 150 ℃ V 1.0 -5- 12.5 V 1.44 1.5 1.56 V 3.43 Ic=10mA, Ib=0 Confidential 3.9 V 550 575 600 mV Collector-emitter breakdown voltage ©On-Bright Electronics mA 250 300 350 ns rig nb O Vcbo Ic mA 可 电 Operation Current FB RegulationIn normal regulation, FB will be regulated to Voltage average of 5.15V Current Sense Input Section TLEB LEB time Over current detection Vth_oc Threshold voltage Td_oc OCP propagation delay Vth_scp Short Current protection threshold voltage Vth_flt CS floating protection threshold voltage EA Section Vref EA reference Kfb/vref FB divider coefficient Frequency Section Freq_Max IC Maximum frequency ∆f/Freq Frequency shuffling range F_shuffling Shuffling frequency Dmax Maximum Duty Cycle F_Burst Burst Mode Switch Frequency Base Driver Section Is_max Base sourcing maximum current Is_preoff Base sourcing current after pre-off Protection Section Vth_OLD FB pin open loop detection threshold voltage Power switch temperature for exiting over temperature protection OTP Power switch temperature for entering over temperature protection Power BJT Section Vceo 2 子 Operation supply current 1.5 CS=0.5V Operation supply current 0.4 FB=6V VDD falling, gate 3 3.7 disappear VDD rising 10.5 11.5 Ramp VDD until gate 14 15 shut down UVLO(OFF) VDD Under Voltage Lockout Exit OVP 10 uA 赛 UVLO(ON) Min Typ. Max Unit VDD=UVLO(off) -1V o I_VDD_op Test Conditions V A Preliminary Datasheet OB_DOC_DS_2222M02 OB2222M High Precision Low Cost Power Switch O nb rig ht co nf id en tia lt o 赛 可 电 子 CHARACTERIZATION PLOTS ©On-Bright Electronics Confidential -6- Preliminary Datasheet OB_DOC_DS_2222M02 OB2222M High Precision Low Cost Power Switch OPERATION DESCRIPTION OB2222M is a cost effective PWM power switch optimized for off-line non-isolated buck or buckboost applications for small home appliances and linear regulator replacement. It operates in current mode and regulates output voltage with dedicated features. High integration can afford low cost and component count solution. 可 电 子 Soft Start OB2222M features an internal 256 cycles (typical) soft start to soften the electrical stress occurring in the power supply during startup. It is activated during the power on sequence. After VDD reaches UVLO(OFF), the switching frequency is gradually increased from 10KHz to 40KHz. Every restart up is followed by a soft start. Startup Current and Start up Control Startup current of OB2222M is designed to be very low so that VDD could be charged up above UVLO threshold and starts up quickly. A large value startup resistor can therefore be used to minimize the power loss in application. 赛 Current Sensing and Leading Edge Blanking Cycle-by-Cycle current limiting is offered in OB2222M current mode PWM control. The switch current is detected by a sense resistor into the CS pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial internal BJT on state so that the external RC filtering on sense input is no longer needed. The PWM duty cycle is determined by the current sense input voltage and the EA output voltage. en tia lt o Operating Current The Operating current of OB2222M is as low as 1.2mA (typical). Good efficiency is achieved with the low operation current together with ‘Multimode’ control features. Constant Power Operation Mode Along with the increase of output current, the inductance current is up to the Vthoc threshold. With the increase in output current, output voltage declines with output power is kept in a about constant level. This is suitable for peak current application. PWM operation The maximum switching frequency of OB2222M is internally fixed at 40KHz (typical). No external frequency setting components are required for PCB design simplification. co nf id At light load or zero load condition, most of the power dissipation in a switching mode power supply is from switching loss on the BJT. The magnitude of power loss is in proportion to the switching frequency. Lower switching frequency leads to the reduction on the power loss and thus conserves the energy. The frequency reduction and burst mode operation are implemented to achieve high efficiency at light load. The minimum switching frequency is 20KHz (typical). Base Driver The driver is a push pull stage with supply voltage VDD. It provides the driving current for the external power bipolar transistor. The sourcing current is limited to Is_max (typical 90mA). ht Protection Control Good power supply system reliability is achieved with its rich protection features including cycle-bycycle current limiting, output short circuit protection, FB pin open loop protection, on-chip Over Temperature Protection (OTP), VDD Over Voltage Protection (OVP), and VDD Under Voltage Lockout Protection (UVLO). O nb rig Frequency shuffling for EMI improvement The frequency shuffling (switching frequency modulation) is implemented in OB2222M. The oscillation frequency is modulated so that the tone energy is spread out. The spread spectrum minimizes the conduction band EMI and therefore eases the system design. ©On-Bright Electronics Confidential -7- Preliminary Datasheet OB_DOC_DS_2222M02 OB2222M High Precision Low Cost Power Switch co nf id en tia lt o 赛 可 电 子 PACKAGE MECHANICAL DATA O nb rig A A1 A2 b c D E E1 e L θ Dimensions In Millimeters Min Max 1.350 1.750 0.050 0.250 1.250 1.650 0.310 0.510 0.170 0.250 4.700 5.150 3.800 4.000 5.800 6.200 1.270 (BSC) 0.400 1.270 0º 8º ht Symbol ©On-Bright Electronics Confidential -8- Dimensions In Inches Min Min 0.053 0.069 0.002 0.010 0.049 0.065 0.012 0.020 0.006 0.010 0.185 0.203 0.150 0.157 0.228 0.244 0.05 (BSC) 0.016 0.050 0º 8º Preliminary Datasheet OB_DOC_DS_2222M02 OB2222M High Precision Low Cost Power Switch IMPORTANT NOTICE 子 RIGHT TO MAKE CHANGES On-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements, improvements and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 赛 可 电 WARRANTY INFORMATION On-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with its standard warranty. Testing and other quality control techniques are used to the extent it deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. On-Bright Electronics Corp. assumes no liability for application assistance or customer product design. Customers are responsible for their products and applications using On-Bright’s components, data sheet and application notes. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. en tia lt o LIFE SUPPORT On-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in medical applications. O nb rig ht co nf id MILITARY On-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in military applications. ©On-Bright Electronics Confidential -9- Preliminary Datasheet OB_DOC_DS_2222M02