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| Under Development Features Boot Strap System Chopper Regulator Outline Dimensions 5.2 8 7 6 5 1 2 3 4 5 6 7 8 VIN VB NC ON/OFF Vadj COM COM VO [PQ1CX12H2ZP] 4.4 Expansion of Chopper Regulator System Model No. Efficiency SW current(MAX) Input voltage Package Outline dimension General purpose type Boot strap system PQ1CY1032ZP/ZZ PQ1CX12H2ZP TYP 82% (12V 5V,2A) TYP 87% (12V 5V,2A) TYP 75% (5V 3.3V,2A) TYP 85% (5V 3.3V,2A) 3.5 A 2.5 A High efficiency 4.5 to 40 V Compact package 4.5 to 20 V TO-263type 5 -pin SOP8 -pin 10.6 x 13.7 x3.5 mm 5.2 x6.2 x1.5 mm 1 2 3 4 1.5 Unit:mm S mark 1.25 Line-up of Chopper Regulator Step down output / Reverse output Package SW current TO-220 0.8A 1.5A Oscillation frequency 300kHz PQ1CG38M2FZ/RZ 100kHz 300kHz 3.5A TO-263 SC-63 3.5A 0.8A 1.5A SOP8 -pin 2.5A 70kHz 150kHz 150kHz 300kHz 100kHz 300kHz 150kHz PQ1CG21H2FZ/RZ PQ1CG41H2FZ/RZ PQ1CG2032FZ/RZ PQ1CG3032FZ/RZ PQ1CY1032ZP/ZZ PQ1CZ38M2ZP/ZZ PQ1CZ21H2ZP/ZZ PQ1CZ41H2ZP/ZZ PQ1CX12H2ZP PQ1CX12H2ZP Specifications Parameter Input voltage Output saturation voltage Switching current Output OFF -state dissipation current Stand -by current Reference voltage Oscillation frequency Efficiency Operating temperature Symbol Characteristics VIN VSAT ISW IQS ISD Vref fOSC Topr MAX 20 V TYP 0.3 V MAX 2.5 A MAX 7 mA VIN=20 V MAX 400 A VIN=20 V TYP 1.26 V TYP 150 kHz TYP 87% VIN=12V,V O=5V,I O=2A -30 to +85 C ISW=2.0 A Conditions Block Diagram VIN VB Drive Circuit Voltage regulator ON/OFF circuit Comparator Over current detection circuit Over Heat Detection circuit COM + Q F/F R S ON/OFF Soft Start + AMP V ref Oadj Vo Feature of Bootstrap Method Chopper Regulator Bootstrap capacitor is installed to supply higher controlled vol tage than input voltage to switching transistor inside. The higher efficiency is obtained due to the switching transisto r's saturated voltage become low by higher controlled voltage than supplied input voltage Conventional (general purpose) Supply from same voltage as input voltage Reduction of switching loss High efficiency To supply from higher voltage than input voltage Charged to bootstrap capacitor Oscill ator VIN driver VCE VIN VBE VO Output salutation voltage: Large : over 1V C 6.2 Bootstrap method driver * High efficiency:TYP 87 % (Compare to conventional model:5 % up) * Low dissipation current :IQS=MAX 7mA (Compare to conventional model:56% down) * Compact package:SOP8 -pin(Outline dimension:5.2 x6.2 x 1.5 mm) Compare to SC -63 package (Mounting area):49 % down Compare to TO -263 package (Mounting area):77 % down fo Conversion circuit VCE Application Circuit Boot strap V B condenser Vo R2 Oadj COM D GND R1 GND CO Vo=3.3V Io=2A L V OUT Driver power supply and output transistor current are supplied from the same power supply. Output salutation voltage: Large (VBE +VCE = over 1V) VO Output saturation voltage Low : 0.3 Driver power and output transistor current is supplied from the separate power supply Output saturation voltage small (V CE=0.3) V IN =5V VIN VC (ON/OFF) CIN Chopper regulator High Efficiency 82% against conventional model ---> The method 87%(at V =12V- Vo=5V) IN Drastic improvement of efficiencyesp in dropper application below 5V Efficiency improvement at low input Conventional efficiency 75% 85% (VIN=5V VO =3.3V) |
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