CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER General Description. Features. Applications

Transcription

1 General Description The is a highly integrated solution for a constant voltage/constant current mode SMPS application. The contains one 1.21V voltage reference with ±1% accuracy, one current sensing circuit and two operational amplifiers. Combining the voltage reference with one operational amplifier makes an ideal voltage controller for use in adapters and battery chargers. The other low voltage reference combined with the other operational amplifier makes it an ideal current limiter for output low side current sensing. The is available in SOT-23-6 package. Features Constant Voltage and Constant Current Control Precision Internal Voltage Reference Few External Components Easy Compensation Low Supply Current: 0.5mA Operating Temperature Range: -40 to 105 o C Applications Adapters Battery Chargers SOT-23-6 Figure 1. Package Type of 1

2 Pin Configuration K Package (SOT-23-6) Pin 1 Dot by Marking V CTRL 1 6 GND 2 5 V SENSE 3 4 I CTRL Figure 2. Pin Configuration of (Top View) Pin Description Pin Number Pin Name Function 1 V CTRL Input pin of the voltage control loop 2 GND Ground 3 Output pin. Sinking current only 4 I CTRL Input pin of the current control loop 5 V SENSE Input pin of the current control loop 6 Power supply 2

3 Functional Block Diagram V 3 1 V CTRL 200mV 2 GND 4 5 I CTRL V SENSE Figure 3. Functional Block Diagram of Ordering Information - Circuit Type G1: Green Package K: SOT-23-6 TR: Tape and Reel Package Temperature Range Part Number Marking ID Packing Type SOT to 105 o C KTR-G1 G6G Tape & Reel BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green. 3

4 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Power Supply Voltage 20 V Input Voltage V IN -0.3 to V Junction Temperature T J 150 o C Storage Temperature T STG -65 to 150 o C Lead Temperature (Soldering, 5sec) T LEAD 260 o C Package Thermal Resistance (Junction to Case) θ JC 92 o C/W Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Unit Power Supply Voltage V Operating Temperature Range T A o C 4

5 Electrical Characteristics ( =5V, T A =25 o C, unless otherwise specified.) Parameter Symbol Conditions Min Typ Max Unit TOTAL CURRENT CONSUMPTION Total Supply Current Not Including the Output Sinking Current VOLTAGE CONTROL LOOP Transconduction Gain (V CTRL ). Sink Current Only I CC ma Gmv ma/mv Voltage Control Loop Reference V REF V Input Bias Current (V CTRL ) I IBV 50 na CURRENT CONTROL LOOP Transconduction Gain (I CTRL ). Gmi ma/mv Current Control Loop Reference V SENSE I OUT =2.5mA mv Current Out of Pin I CTRL at -200mV I IBI 25 µa OUTPUT STAGE Low Output Voltage at 10mA Sinking Current Output Short Circuit Current. Output to. Sink Current Only V OL 200 mv I OS ma 5

6 Typical Performance Characteristics =12V =5V =2.5V V REF (V) V SENSE (mv) Ambient Temperature ( o C) Ambient Temperature ( o C) Figure 4. V REF vs. Ambient Temperature Figure 5. V SENSE vs. Ambient Temperature I IBV (na) =12V =5V =2.5V I IBI (µa) =12V =5V =2.5V Ambient Temperature ( o C) Ambient Temperature ( o C) Figure 6. V CTRL Pin Input Bias Current vs. Ambient Temperature Figure 7. I CTRL Pin Input Bias Current vs. Ambient Temperature 6

7 Typical Performance Characteristics (Continued) =12V =5V =2.5V I OS (ma) 30 I CC (ma) =12V =5V =2.5V Ambient Temperature ( o C) Ambient Temperature ( o C) Figure 8. Output Short Circuit Current vs. Ambient Temperature Figure 9. Supply Current vs. Ambient Temperature 7

8 Typical Application + To primary R2 I L 1.210V R4 R3 C1 + + V CTRL Load C3 GND R5 I CTRL V SENSE R Rss V OUT = V REF + R2 V CurrentLim it = R SENSE SS (V) (A) Figure 10. Typical Application 1 of 8

9 Typical Application (Continued) + To primary R2 I L 1.210V R4 R3 C1 + + V CTRL Load C3 GND R5 I CTRL V SENSE R Rss + R2 V O = [ VREF + ( I L RSS )] ( I L RSS ) UT V CurrentLim it = R SENSE SS (A) (V) Figure 11. Typical Application 2 of 9

10 Typical Application (Continued) + To primary R2 I L 1.210V R4 R3 C1 + + V CTRL Load C3 GND R5 I CTRL V SENSE R Rss + R2 V OUT = VREF ( I L R CurrentLimit = V SENSE V REF SS ( VSENSE + VREF ) RSS ) (V) (A) Figure 12. Typical Application 3 of 10

11 Mechanical Dimensions SOT-23-6 Unit: mm(inch) 2.820(0.111) 3.020(0.119) 0.300(0.012) 0.400(0.016) (0.008) (0.012) 0.600(0.024) 2.650(0.104) 2.950(0.116) Pin 1 Dot by Marking 1.500(0.059) 1.700(0.067) (0.028)REF 0.950(0.037)TYP 1.800(0.071) 2.000(0.079) 0.000(0.000) 0.150(0.006) 0.100(0.004) 0.200(0.008) 0.900(0.035) 1.300(0.051) 1.450(0.057) MAX 11

12 IMPORTANT NOTICE reserves the right to make changes without further notice to any products or specifications herein. does not assume any responsibility for use of any its products for any particular purpose, nor does assume any liability arising out of the application or use of any its products or circuits. does not convey any license under its patent rights or other rights nor the rights of others. MAIN SITE BCD - Headquarters Semiconductor Manufacturing Limited - Wafer BCD FabSemiconductor Manufacturing Limited BCD - Wafer Semiconductor Fab Manufacturing Limited Shanghai - IC Design SIM-BCD Group Semiconductor Manufacturing Co., Ltd. No. Shanghai 1600, Zi SIM-BCD Xing Road, Semiconductor Shanghai ZiZhu Manufacturing Science-based Limited Industrial Park, , China 800 Yi Advanced Shan Road, Analog Shanghai Circuits , (Shanghai) China Corporation Tel: 800, , Yi Shan Road, Shanghai Fax: , China Tel: F, Zone B, 900, 1491, Yi Fax: Shan Road, Shanghai , China Tel: , Fax: Tel: , Fax: REGIONAL SALES OFFICE REGIONAL Shenzhen OfficeSALES OFFICE Shenzhen Shanghai SIM-BCD Office Semiconductor Manufacturing Co., Ltd., Shenzhen Office Shanghai Unit A Room SIM-BCD 1203, Skyworth Semiconductor Bldg., Gaoxin Manufacturing Ave.1.S., Nanshan Co., Ltd. District, Shenzhen Shenzhen, Office Advanced China Analog Circuits (Shanghai) Corporation Shenzhen Office Taiwan Office BCD Taiwan Semiconductor Office (Taiwan) Company Limited 4F, 298-1, BCD Rui Semiconductor Guang Road, (Taiwan) Nei-Hu District, Company Taipei, Limited Taiwan 4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei, USA Office USA BCD Office Semiconductor Corp. BCD Semiconductor Huntwood Ave. Corporation Hayward, CA 94544, Huntwood USA Ave. Hayward, Room Tel: E, 5F, Noble 7951 Center, No.1006, 3rd Fuzhong Road, Futian District, Shenzhen , China Tel: Taiwan 2808 CA Tel : 94544, U.S.A Tel: Fax: Fax: Fax: Tel: Fax: Tel Fax: : Fax: