Advanced Power Electronics Corp. APE1702 150KHz, 3A PWM BUCK DC/DC CONVERTER FEATURES Output Voltage : 3.3V, 5V, 12V and Adjustable Output Voltage Adjustable Version Output Voltage Range, 1.23V to 19.5V+4% 150KHz +15% Fixed Switching Frequency. Voltage Mode Non-synchronous PWM Control. Thermal-shutdown and Current-limit Protection. ON/OFF Shutdown Control Input. Short Circuit Protect(SCP) Operating Voltage can be up to 22V Output Load Current 3A 5-Lead TO-263/TO-220 Low Power Standby Mode. Built-in Switching Transistor on Chip RoHS Compliant DESCRIPTION The APE1702 series are monolithic IC designed for a step-down DC/DC converter, and own the ability of driving a 3A load without additional transistor. It saves board space. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control having good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. if current limit function occurs and VFB is down below 0.5V the switching frequency will be reduced. The APE1702 series operates at a switching frequency of 150KHz thus allow smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed +4% tolerance on output voltage under specified input voltage and output load conditions, and +15% on the oscillator frequency. The output version included fixed 3.3V, 5V, 12V and an adjustable type. The chips are available in a 5-Lead TO-263 and 5-Lead TO-220 package. TYPICAL APPLICATION 1. ADJUSTABLE OUTPUT VOLTAGE VERSION 2. ADJUSTABLE OUTPUT VOLTAGE VERSION WITH DELAYED STARTUP Data and specifications subject to change without notice 1 200803105 Advanced Power Electronics Corp. APE1702 TYPICAL APPLICATION 3. FIXED OUTPUT VOLTAGE VERSION ORDERING INFORMATION ORDER INFORMATION APE1702X-XX PACKAGE TYPE OUTPUT VOLTAGE S : TO-263-5L P : TO-220-5L 33 : 3.3V 50 : 5.0V 12 : 12V Blank : ADJ 2 Advanced Power Electronics Corp. ABSOLUTE MAXIMUM RATINGS (at T =25°C) APE1702 A Maximum Supply Voltage(VCC) +24V ON/OFF PIN Input Voltage(VEN) -0.3V to VCC Feedback PIN Voltage(VFB) -0.3V to 16V Output Voltage to Ground(VOUT) -0.7 to 24V Power Dissipation(PD) (TJ-TA)/RthJA Storage Temperature Range(TST) -65°C To 150°C Operating Temperature Range(TOP) -40°C To 125°C Operating Supply Voltage(VOP) +4.5V to +22V Thermal Resistance from Junction to Case(Rth JC) 3.5°C/W Thermal Resistance from Junction to Ambient(RthJA) 20°C/W 2 Note. Rth JA is measured with the PCB copper area(need connect to Metal tab) of approx. 3 in (multi-layers) PACKAGE INFORMATION TO-263-5L TO-220-5L ELECTRICAL SPECIFICATIONS (VIN=12V, TA=25℃, unless otherwise specified) Parameter SYM Quiescent Current ICCQ Feedback Bias Current Shutdown Supply Current IFB ISD TEST CONDITION Max. Duty Cycle (ON) Min. Duty Cycle (OFF) Oscillation Frequency Oscillation Frequency of Short Circuit Protect Saturation Voltage ICL DC VSAT MAX UNITS mA - 4 8 VFB=1.3V - -10 -50.0 (ADJ Version Only) - -10 -100.0 VEN=5V - 35 100 uA VCC=22V - 35 100 uA 3.3 - - A VFB=0V force driver on - 100 - % VFB=12V force driver off - 0 - % 127 150 173 KHz 110 - 173 KHz - 60 - - 1.3 VFB=0V force driver on FOSC FSCP TYP VFB=12V force driver off Pear Current, No outside circuit Current Limit MIN (Adjustable) When VFB < 0.5V (Fixed) When < VOUT x 40% IOUT=2A, No outside circuit VFB=0V force driver on 1.5 1.6 nA KHz KHz V 3 Advanced Power Electronics Corp. APE1702 ELECTRICAL SPECIFICATIONS(Cont.) Parameter SYM EN PIN Logic Input Threshold Voltag EN PIN Input Current SW PIN Leakage Current SW PIN=0V SW PIN=-0.8V Thermal Shutdown Temp. Version UNITS - V VIL Low (regulator OFF) - 0.6 V ISH VEN=2.5V(OFF) - -0.1 -0.5 uA ISL VEN=0.5V(ON) - - -0.01 uA - - -200 uA - -5 - mA - 135 - °C MIN TYP MAX UNITS 1.193/ 1.180 1.23 1.267/ 1.280 V - No outside circuit ISWL VFB=12V force driver on VCC=22V force driver off TSD VFB Efficiency η APE1702-12V MAX 2 Output Feedback Voltage APE1702-5.0V TYP High (regulator ON) Symbol APE1702-3.3V MIN VIH Characteristics APE1702-ADJ TEST CONDITION Conditions 4.5V < VCC < 22V 0.2A < ILOAD <3A 1.3 VOUT programmed for 3.3V Output Voltage VOUT Efficiency η Output Voltage VOUT Efficiency η Output Voltage VOUT Efficiency η VCC=12V, ILOAD=3A 4.75V < VCC < 22V 0.2A < ILOAD <3A VCC=12V, ILOAD=3A 7V < VCC < 22V 0.2A < ILOAD <3A VCC=12V, ILOAD=3A 15V < VCC < 22V 0.2A < ILOAD <3A VCC=15V, ILOAD=3A 74 - % 3.168/ 3.135 3.3 3.432/ 3.465 V - 75 - % 4.80/ 4.75 5.0 5.20/ 5.25 V - 80 - % 11.52/ 11.4 12 12.48/ 12.6 V - 89 - % PIN DESCRIPTIONS PIN SYMBOL VSS PIN DESCRIPTION GND Pin FB Control Voltage Feedback Control for ADJ Version EN ON/OFF Shutdown OUT Output Voltage Feedback Control for Fixed Version SW Switching Output VCC IC Power Supply Pin 4 Advanced Power Electronics Corp. APE1702 BLOCK DIAGRAM FUNCTION DESCRIPTION PIN FUNCTION VCC This is positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. VSS Circuit ground. SW Internal Switch. The voltage at this pin switches between (+VCC - VSAT) and approximately - 0.5V, with a duty cycle of approximately VOUT / VCC. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be minimized. FEEDBACK Senses in the regulated output voltage to complete the feedback loop. 5 Advanced Power Electronics Corp. APE1702 FUNCTION DESCRIPTION EN Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supple current to approximately 100uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of VCC) shuts the regulator down. if this shutdown feature is not needed, the EN pin can be wired to the ground pin. THERMAL CONSIDERATIONS The TO-263-5L package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The APE1702 junction temperature rises above ambient temperature for a 2A load and different input and output voltages. The data for these curves was taken with the APE1702 (TO-263-5L package) operating as a buck-switching regulator in an ambient temperature of 25°C (still air). These temperature increments are all approximate and are affected by many factors. Higher ambient temperatures required more heat sinker. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper (need connect to the VSS pins) should be used in the board layout, (One exception is the SW pin, which should not have large areas of copper.) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature increments are all approximate. The increments are affected by a lot of factors. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board. 6 Advanced Power Electronics Corp. APE1702 Typical Characteristics VFB VS VIN ICCQ VS VIN ICCQ VS VIN VFB VS VIN 6.00 1.28 5.00 1.26 Iccq(mA) VFB(V) 4.00 1.24 1.22 3.00 2.00 1.20 1.00 1.18 0.00 4 6 4 8 10 12 14 16 18 20 22 24 Vin(V) FOSC VS VIN 6 8 10 12 14 16 18 20 22 24 Vin(V) FOSC VS TEMPERATURE FOSC VS TEMP 180 165 170 160 160 Vout(V) Fosc(KHz) Fosc VS VIN 170 155 150 150 140 145 130 120 140 4 6 8 -20 10 12 14 16 18 20 22 24 0 20 Vin(V) VFB VS TEMPERATURE 40 60 80 temp (℃ ) 100 120 ICCQ VS TEMPERATURE VFB VS TEMP ICCQ VS TEMP 1.28 6.00 1.26 5.00 Vout(V) Vout(V) 4.00 1.24 1.22 3.00 2.00 1.20 1.00 1.18 0.00 -20 0 20 40 60 80 temp (℃ ) 100 120 -20 0 20 40 60 80 temp (℃ ) 100 120 7 Advanced Power Electronics Corp. APE1702 Typical Characteristics Output Ripple Power on test wave (VIN=12V, VOUT=5V, IOUT=3A) (VIN=12V, VOUT=5V, IOUT=3A ) VOUT (AC) VOUT VIN SW SW ISW ISW Load Transient Response EN on test wave (VIN=12V, VOUT=5V, IOUT=0.2~3A) (VIN=12V, VOUT=5V, IOUT=3A ) VOUT (AC) VIN VOUT SW SW ISW Efficiency Efficiency (VIN=12V, VOUT=5.0V) (VIN=12V, VOUT=3.3V) 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Iout(A) Efficiency(%) Efficiency(%) ISW 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0.0 0.5 1.0 1.5 2.0 2.5 Iout(A) 3.0 8 ADVANCED POWER ELECTRONICS CORP. Package Outline : TO-263-5L Millimeters SYMBOLS MIN NOM MAX A 4.40 4.60 4.80 b 0.66 0.79 0.91 L4 0.00 0.15 0.30 c 0.36 0.43 0.50 L1 2.29 2.54 2.79 E 9.80 10.10 10.40 7.60 E1 c2 1.25 8.60 8.80 D1 5.90 e 1.70 L θ 1.45 1.27 L2 D 1.35 9.00 14.60 15.20 15.80 0° 4° 8° 1.All Dimensions Are in Millimeters. 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : TO-263-5L Part Number Output voltage 1702S-XX LOGO Package Code YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 9 ADVANCED POWER ELECTRONICS CORP. Package Outline : TO-220-5L Millimeters SYMBOLS MIN NOM MAX A 4.07 4.45 4.82 b 0.76 0.89 1.02 C D E e 0.36 0.50 0.64 14.22 14.86 15.50 9.78 10.16 10.54 1.57 1.71 1.85 e1 6.68 6.81 6.93 F 1.14 1.27 1.40 H1 5.46 6.16 6.86 J1 2.29 2.74 3.18 L 13.21 13.97 14.73 φp Q 3.68 3.81 3.94 2.54 2.73 2.92 1.All Dimensions Are in Millimeters. 2.Dimension Does Not Include Mold Protrusions. Part Marking Information & Packing : TO-220-5L Part Number 1702P-XX LOGO Output voltage Package Code YWWSSS Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 10