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