Advanced Power Electronics Corp. APE1832 2A, 0.25V FEEDBACK VOLTAGE STEP-DOWN SWITCHING REGULATORS FOR LED DRIVER FEATURES DESCRIPTION APE1832 / APE1832A consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. APE1832 / APE1832A provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly from 0 up to 100%. An enable function, an over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SO-8 package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter. Input Voltage : 3.6V to 23V Output Voltage : 0.25V to VCC Duty Ratio : 0% to 100% PWM Control Oscillation Frequency : APE1832 : 330KHz Typ. APE1832A : 500KHz Typ. LED Backlight and High Power LED Application Enable/Disable Function Current Limit (CL), Thermal Shutdown and Short Circuit Protections (SCP). Built-in Internal SW P-channel MOS. No Output Capacitor is Stable. SO-8 Pb-Free Package. TYPICAL APPLICATION A. 1W/3W LED x 1 for DC Input U1 VCC R1 100K FB VSS EN COMP VSS SW VCC SW VOUT L1 D7 22uH (10uH for APE1832A) LED APE1832 / APE1832A D6 C2 22u C3 0.1u C4 1u 1N4148 R4 4.7K Option R5 100K Data and specifications subject to change without notice D5 C1 B240A 4.7u R2 0.75R/0.33R 1W/3W 1 201201303 Advanced Power Electronics Corp. APE1832 TYPICAL APPLICATION B. 1W/3W LED x 1 for AC Input (1) No Output Capacitor U1 AC 12V IN FB EN COMP AC D4 AC D3 VCC AC D2 VSS VSS SW VOUT L1 D2 LED SW APE1832 / APE1832A R5 AC D1 C3 C2 Part No. APE1832 APE1832A I LED R2 D5 C5 100nF 0.1u B240A R2 C2 R5 350mA 0.715Ω 87.5mW 100uF 0.22K 750mA 0.333Ω 189mW 220uF 0.47K 1000mA 0.250Ω 250mW 330uF 0.47K 350mA 0.715Ω 87.5mW 100uF 0.22K 750mA 0.333Ω 189mW 220uF 0.47K 1000mA 0.250Ω 250mW 330uF 0.47K L1 68uH 47uH (2) Add 4.7uF Output Capacitor U1 AC D4 AC 12V IN AC D3 AC D2 R5 100R AC D1 FB VSS EN VSS COMP SW VCC SW VOUT L1 D2 LED APE1832 / APE1832A C1 4.7u C4 C3 C2 Part No. APE1832 APE1832A 0.1u C5 100n R2 I LED R2 D5 B240A C2 350mA 0.715Ω 87.5mW 100uF 750mA 0.333Ω 189mW 220uF 1000mA 0.250Ω 250mW 330uF 350mA 0.715Ω 87.5mW 100uF 750mA 0.333Ω 189mW 220uF 1000mA 0.250Ω 250mW 330uF C4 L1 10nF 33uH 3.3nF 22uH ORDERING / PACKAGE INFORMATION ( Top View ) APE1832 X X Frequecny Blank : 330KHz A : 500KHz Package Type M : SO-8 FB 1 EN 2 Comp 3 Vcc 4 APE1832 / APE1832A 8 Vss 7 Vss 6 SW 5 SW SO-8 2 Advanced Power Electronics Corp. APE1832 ABSOLUTE MAXIMUM RATINGS (at TA=25°C) VCC PIN Voltage(VCC) ------------------------------------- VSS -0.3V to VSS +25 V Feedback PIN Voltage(VFB) ----------------------------- VSS -0.3V to VCC ON/OFF PIN Voltage(VEN) ------------------------------- VSS -0.3V to VCC + 0.3V Switch PIN Voltage(VSW) --------------------------------- VSS -0.3V to VCC + 0.3V Power Dissipation(PD) ------------------------------------- Internally Limited Storage Temperature Range(TST) --------------------- -40°C To 150°C Operating Temperature Range(T OP) ------------------ -40°C To 125°C Operating Supply Voltage(VOP) ------------------------- +3.6V to +23V Thermal Resistance from Junction to Case(Rth JC) 25°C/W Thermal Resistance from Junction to Ambient(RthJA) 70°C/W Note. Rth JA is measured with the PCB copper area(need connect to SW pins) of approx. 1 in 2 (multi-layers) ELECTRICAL SPECIFICATIONS(VIN=12V, TA=25°C, unless otherwise specified) Parameter Feedback Voltage SYM VFB TEST CONDITION IOUT=0.2A Quiescent Current ICCQ MIN 0.24 TYP 0.25 MAX 0.26 UNITS V VFB=1.2V force driver off - 3 5 mA Feedback Bias Current IFB IOUT=0.1A - 0.1 0.5 uA Shutdown Supply Current ISD VEN =0V uA Switch Current ISW Line Regulation Load Regulation △VOUT/VOUT VCC = 5V~23V, IOUT=0.2A △VOUT/VOUT IOUT = 0.1 to 2A - 2 10 2.5 - - A - 1 2 % - 0.2 0.5 % APE1832 260 330 400 KHz APE1832A KHz Oscillation Frequency FOSC 400 500 600 EN Pin Logic Input Threshold Voltage VSH Slew rate > 120mV/μs 2 - - VSL - - 0.8 ISH Slew rate > 120mV/μs VEN=2.5V (ON) - 20 - uA ISL VEN=0.3V (OFF) - -10 - uA VCC=5V, VFB=0V - 100 140 VCC=12V, VFB=0V - 70 100 IOUT = 1A - 91 - IOUT = 2A - 91 - - 140 - EN Pin Input Current Internal MOSFET RDSON RDSON Efficiency EFFI Thermal Shutdown Temp TSD VOUT = 5V V mΩ % °C PIN DESCRIPTIONS PIN SYMBOL VSS FB PIN DESCRIPTION GND Pin Feedback Pin Power -Off Pin EN H : Normal Operation(Step-down) L : Step-down Operation Stopped (All circuits deactivated) Comp SW VCC Compensation Pin Switch Pin. Connect External Inductor & Diode here. IC Power Supply Pin 3 Advanced Power Electronics Corp. APE1832 BLOCK DIAGRAM SW Oscillator Circuit Vcc Reference Voltage + PWM Switched Control Circuit Thermal Shutdown VEN - FB Vss Current Limit Comp EN FUNCTION DESCRIPTION PWM Control The APE1832 / APE1832A consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the APE1832 / APE1832A, the pulse width varies in a range from 0 to 100%, 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, these converters provide a low-ripple power over broad ranges of input voltage and load current. Setting the ILED Current Application circuit item shows the basic application circuit with APE1832 / APE1832A adjustable output version. The external resistor sets the LED output current according to the following equation: Table 1 Resistor select for LED output current setting ⎛ 0.25V ⎞ I LED = ⎜⎝ R 2 ⎟⎠ R2 ILED 350mA 0.715Ω 87.5mW 750mA 0.333Ω 189mW 1000mA 0.250Ω 250mW RDS(ON) Current Limiting The current limit threshold is setting by the internal circuit. Compensation Please refer the table of application circuit. For DC input, the option circuit for compensation is connecting R4 and a 4148 diode to VOUT. In order to protect short circuit and thermal shutdown release for LED. PCB layout guide If you need low Tc and Tj or large PD (Power Dissipation), the dual SW pins (5&6) on the SO-8 package are internally connected to die pad, The PCB layout should allow for maximum possible copper area at the SW pins of the APE1832 / APE1832A. 4 Advanced Power Electronics Corp. APE1832 TYPICAL PERFORMANCE CHARACTERISTICS APE1832A APE1832 5 Advanced Power Electronics Corp. APE1832 MARKING INFORMATION SO-8 1832XM YWWSS Part Number Frequency option : Blank : 330 KHz Package Code A : 500KHz Date Code (YWWSSS) Y：Last Digit Of The Year WW：Week SSS：Sequence 6 Advanced Power Electronics Corp. APE1832 H E PACKAGE OUTLINES θ L DETAIL A b D e y A1 C A A2 7 (4X) Dimensions in Millimeters Min. Nom. Max. A 1.75 A1 0.1 0.25 A2 1.25 C 0.1 0.2 0.25 D 4.7 4.9 5.1 E 3.7 3.9 4.1 H 5.8 6 6.2 L 0.4 1.27 b 0.31 0.41 0.51 e 1.27 BSC y 0.1 θ 0O 8O Mold flash shall not exceed 0.25mm per side JEDEC outline: MS-012 AA Symbol DETAIL A Dimensions in Inches Min. Nom. Max. 0.069 0.04 0.1 0.049 0.0075 0.008 0.01 0.185 0.193 0.2 0.146 0.154 0.161 0.228 0.236 0.244 0.015 0.05 0.012 0.016 0.02 0.050 BSC 0.004 0O 8O