Advanced Power Electronics Corp. APE3061 PWM STEP-UP CONTROLLER FEATURES DESCRIPTION Input Voltage : 3.0V to 24V The APE3061 is high efficient PWM step-up controller. Designed to drive an external N-channel MOSFET, Output voltage is programmable with 1.0V of standard voltage supply internal, and using externally connected components, output voltage (FB) can be set up at will. The APE3061 can be operated at switching frequencies of 500kHz allowing for easy filtering and low noise, the size of the external components can be reduced. An enable function and thermal shutdown functions are built inside. The soft-start time can be programmed by outside capacitor; the function prevents overshoot at startup. Output Voltage: Define by N-channel MOS Duty Ratio: 0% to 85% PWM Control Oscillation Frequency: 500KHz (±20%) Soft-start Time is Programmed by Outside Capacitor Current Limit is Setting by Outside Resistance Thermal Shutdown Protection Enable/Shutdown Function External SW N-channel MOS. DFN 3x3-8L Pb-Free Package. TYPICAL APPLICATION Vout=12V/1.0A VIN =5V D1 B340A L1 15uH U1 R3 100K C1 C2 EN NC 470uF 0.1uF Vcc GND C5 0.1uF FB GATE SS SENSE Q1 NMOS RSENSE 0.02 R1 11K C4 C3 470uF 4.7u R2 1K C6 APE3061 0.1uF VOUT = VFB x (1+R1/R2) , VFB = 1.0V, R2= 1K~3K Note1. C4 capacitor ESR suggest 30m ~ 100mΩ Note2. When Vin voltage under 4V, must to separate the Vin & Vcc input voltage then Vout will be assured PACKAGE / ORDERING INFORMATION ( Top View ) APE3061X Package Type GN3 : DFN 3x3 EN 1 VCC 2 FB 3 SS 4 8 GND NC 7 GND 6 GATE 5 SENSE DFN 3x3 Data and specifications subject to change without notice 1 201205085 Advanced Power Electronics Corp. APE3061 ABSOLUTE MAXIMUM RATINGS VCC Pin Voltage (VCC) ----------------------------------- VSS - 0.3V to VSS + 26V Feedback Pin Voltage(VFB) ------------------------------ VSS - 0.3V to 12V EN Voltage (VEN) ------------------------------------------- VSS - 0.3V to VCC SENSE Voltage (VSENSE) --------------------------------- VSS - 0.3V to VCC SS Pin Voltage (VSS) -------------------------------------- VSS - 0.3V to VCC Gate Pin Voltage (VGATE) --------------------------------- VSS - 0.3V to VCC Power Dissipation (PD) ----------------------------------- Internally limited Storage Temperature Range (T ST) -------------------- -40 to +150°C Operating Junction Temperature Range (T OPJ) --- -20 to +125°C Operating Supply Voltage (VOP) ------------------------ +3V to +24V Thermal Resistance from Junction to Case(Rth JC) 40°C/W Thermal Resistance from Junction to Ambient(RthJA) 150°C/W Note. RthJA is measured with the PCB copper area of approximately 1 in2 (Multi-layer). ELECTRICAL SPECIFICATIONS (VIN=5V, VOUT=12V, TA=25oC, unless otherwise specified) Parameter MIN TYP MAX UNITS 0.975 1 1.025 V VFB=1.5V force driver off - 4 6 mA IFB IOUT=0.1A - 0.1 0.5 uA ISD VEN =0V - 1 10 uA FOSC SW pin 400 500 600 KHz 0.05 0.06 0.07 V - uA SYM TEST CONDITION Feedback Voltage VFB IOUT=0.1A Quiescent Current ICCQ Feedback Bias Current Shutdown Supply Current Oscillation Frequency Sense Voltage VSENSE Soft Start Current ISS VSS=0V - 8 EN Pin Logic Input Threshold Voltage VSH High (regulator ON) 2 - - VSL Low (regulator OFF) - - 0.8 ISH VEN=2.5V (ON) - 20 - uA ISL VEN=0.3V (OFF) - -1 - uA EN Pin Input Current LX Rise Time TLXR CLX=1000pF - 60 - LX Fall Time TLXF CLX=1000pF - 60 - Efficiency EFFI VCC=5V, VOUT=12V, IOUT=1A - 91 - Maximum Duty Cycle DCMAX VFB=0V - 85 - Minimum Duty Cycle DCMIN VFB=1.5V - 0 - - 145 - Thermal Shutdown Temp TSD V ns % % o C 2 Advanced Power Electronics Corp. APE3061 PIN DESCRIPTIONS PIN SYMBOL PIN DESCRIPITON SS Soft-Start pin SENSE Current Limit Sense Voltage GATE VCC Gate drive for external N-channel MOSFET. GND Ground Pin VCC supply pin FB Feedback Pin EN H : Normal operation Shutdown Pin L : Shutdown NC No connection BLOCK DIAGRAM Vcc Phase Compensation FB Regulator + + - Vref=1.0V Buffer Driver PWM Controller GATE Oscillator EN 8uA VEN Thermal Shutdown SS GND 0.06V SENSE BLOCK DIAGRAM PWM Control The APE3061 is high efficient PWM step-up controller. In controllers of the APE3061, the pulse width varies in a range from 0 to 85%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, APE3061 provide a low-ripple power over broad ranges of input voltage and load current. 3 Advanced Power Electronics Corp. APE3061 APPLICATION INFORMATION Setting the Output Voltage Application circuit item shows the basic application circuit with APE3061 adjustable output version. The external resistor sets the output voltage according to the following equation: V OUT R1 ⎞ ⎛ = 1.0V × ⎜1 + ⎟ R 2⎠ ⎝ Table 1 Resistor select for output voltage setting VOUT R2 R1 12V 1K 11K 15V 1.5K 21K 18V 1K 17K 24V 1.3K 30K Current Limiting Setting The current limit threshold is setting by the external resistor (RSENSE) connecting from SENSE pin to GND (refer the application circuit). The internal current limit compared voltage is 60mV. When the SENSE voltage is larger than 60mV, an over-current condition is triggered. Please refer to the formula for setting the minimum current limit value: ISW(MAX) = 60m RSENSE Note: ISW (MAX) is the maximum N-MOSFET current. Inductor Selection For most designs, Low inductance values are physically smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from the following equation: L = V IN V × (V OUT − V IN ) OUT × ∆I L × f LX Where is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor ripple current approximately 15% of the maximum input current 3A, ΔIL=0.45A. Table 2 Inductor select for output voltage setting (V CC=5V) VOUT 9V 12V 15V 18V L1 Value 18uH 15uH 10uH 10uH The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation (3A+0.25A). 4 Advanced Power Electronics Corp. APE3061 APPLICATION INFORMATION Input Capacitor Selection The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must be used. The capacitor voltage rating should be at least 1.5 times greater than the input voltage, and often much higher voltage ratings are needed to satisfy. Output Capacitor Selection The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The output capacitor must have low impedance at the switching frequency. A low ESR capacitor sized for maximum RMS current must be used. The low ESR requirements needed for low output ripple voltage. The capacitor voltage rating should be at least 1.5 times greater than the input voltage, and often much higher voltage ratings are needed to satisfy. The ESR range of output capacitor is 30m~100mΩ at switch current more than 1.5A. Add a 4.7uF output bypass capacitor in order to reduce output ripple effectively. Layout Guidance When laying out the PC board, the following suggestions should be taken to ensure proper operation of the APE3061. These items are also illustrated graphically in below. 1. The power traces, including the NMOS Drain & Source trace, the inductor and the C1 trace should be kept short, direct and wide to allow large current flow. 2. The ground area for RSENSE and C1 must be closed and C2 closed VCC pin of APE3061 to get good stability. 3. Keep the switching node, away from the sensitive FB node. 4. Do not trace signal line under inductor. 5 Advanced Power Electronics Corp. APE3061 TYPICAL PERFORMANCE CHARACTERISTICS IOUT VS VOUT Vout (V) Vout (V) VCC VS VOUT 13 12.8 12.6 12.4 12.2 12 11.8 11.6 11.4 11.2 11 IOUT=0.1A 3 4 5 6 7 8 9 13 12.8 12.6 12.4 12.2 12 11.8 11.6 11.4 11.2 11 VCC=5V 0 10 100 Temperature VS Shutdown Current 400 500 600 75 100 Temperature VS VFB VCC=20V 9 8 300 1.05 1.04 1.03 7 6 VFB (V) Shutdown Current (uA) 10 200 IOUT (mA) VCC (V) 5 4 1.02 1.01 1.00 0.99 0.98 3 2 0.97 0.96 1 0 0.95 -50 -25 0 25 50 Temperature (℃) 75 100 Power-ON Wave (VCC=5V, VOUT=12V, Load=0.7A, SS=0.1uF) -50 -25 0 25 50 Temperature (℃) Enable-ON Wave (VCC=5V, VOUT=12V, Load=0.7A, SS=0.1uF) 6 Advanced Power Electronics Corp. APE3061 MARKING INFORMATION DFN 3x3-8L Part Number Package Code 3061GN3 YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 7