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| NJM2340 HIGH PRECISION DC/DC CONVERTER CONTROL IC GENERAL DESCRIPTION NJM2340 is a high precision DC/DC converter control IC with current sense amplifier. It uses a low side current sensing which reduces external components and improves accuracy. It is applicable for a wide range of application since it features high operating voltage and small outline packages. PACKAGE OUTLINE NJM2340M NJM2340RB1 FEATURES PWM switching control Operating Voltage (3.6 to 32V) Wide Oscillator Range (20kHz to 500 kHz) Duty Cycle (0% to 100%) Current Sensing Amplifier High Precision Reference Voltage Voltage Detect: 1V1.5% Current Detect: 150mV4% Bipolar Technology Package Outline DMP8, TVSP8 PIN CONFIGURATION 1 2 3 4 8 7 6 5 NJM2340M NJM2340RB1 Pin Function 1.IN1 2.IN2 3.F.B 4.GND 5.OUT 6.CT 7.VREF 8.V+ Ver 2.0 - 1 - NJM2340 BLOCK DIAGRAM V+ 8 VREF 7 CT 6 OUT 5 VREF OSC ERROR AMP 1V PWM CURRENT SENSE AMP 0.15V 1 IN1 2 IN2 3 F.B 4 GND ABSOLUTE MAXIMUM RATINGS (Ta=25C ) PARAMETER SYMBOL RATINGS + Maximum Supply Voltage V 36 Output Sink Current ISINK 15 (DMP8) 300 Power Dissipation PD (TVSP8) 320 Operating Temperature Range Topr -40 +85 Storage Temperature Range Tstg -50 +150 UNIT V mA mW C C RECOMMENDED OPERATING CONDITIONS (Ta=25C) PARAMETER Supply Voltage Oscillation Frequency Oscillator Timing Resistance SYMBOL V+ fosc RT MIN. 3.6 20 20 MAX. 32 500 100 UNIT V kHz k -2- NJM2340 ELECTRICAL CHARACTERISTICS (V+=12V,Ta=25C) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL TEST CONDITION Output Voltage Line Regulation Load Regulation OSCILLATOR BLOCK PARAMETER Oscillation Frequency VREF LINE LOAD IOR=1mA V =3.6 32V, IOR=1mA IOR=0.1 5.0mA + MIN. 1.98 - - TYP. 2.00 4.0 6.0 MAX. 2.02 20 40 UNIT V mV mV SYMBOL fOSC TEST CONDITION RT=27k, CT=220pF MIN. 315 TYP. 350 MAX. 385 UNIT kHz CURRENT SENSE AMPLIFIER BLOCK PARAMETER SYMBOL Reference Voltage1 Input Bias Voltage1 Maximum Output Voltage1 (F.B Pin) Maximum Source Current1 (F.B Pin) ERROR AMPLIFIER BLOCK PARAMETER Reference Voltage2 Input Bias Voltage2 Maximum Output Voltage2 (F.B Pin) Maximum Source Current2 (F.B Pin) PWM COMPARATE BLOCK PARAMETER Input Threshold Voltage (F.B Pin) Input Threshold Voltage (F.B Pin) OUTPUT BLOCK PARAMETER L Output Voltage (OUT Pin) GENERAL CHARACTERISTICS PARAMETER Average Quiescent Current VB 1 IB1 VOM+1 VOM-1 IOM1 TEST CONDITION MIN. 144 - - 0.6 40 TYP. 150 20 VREF -0.15 0.75 85 MAX. 156 100 - 0.9 200 UNIT mV nA V V A RNF=100k RNF=100k VOM1=0.5V SYMBOL VB 2 IB2 VOM+2 VOM-2 IOM2 TEST CONDITION MIN. 0.985 - - 0.6 40 TYP. 1.000 20 VREF -0.15 0.75 85 MAX. 1.015 100 - 0.9 200 UNIT V nA V V A RNF=100k RNF=100k VOM2=0.5V SYMBOL VTH0 VTH100 TEST CONDITION duty*cycle=0% (note) duty*cycle=100% (note) MIN. VOM- TYP. 1.0 1.4 MAX. 1.1 - UNIT V V SYMBOL VOL TEST CONDITION ISINK=10mA MIN. - TYP. 0.5 MAX. 0.7 UNIT V SYMBOL ICCAV TEST CONDITION RL=, duty*cycle=50% MIN. - TYP. 1.5 MAX. 2.0 UNIT mA (note) Duty*Cycle is defined as follows: Duty*Cycle=0%: IC output transistor is OFF. Duty*Cycle=100%: IC output transistor is ON. -3- NJM2340 TYPICAL APPLICATION VIN Q1 RT 27k CT 220pF RBE V+ VREF CT OUT RBC 5 L VOUT 8 7 6 VREF OSC ERROR AMP 1V R2 PWM CURRENT SENSE AMP CIN D1 COUT 0.15V 1 2 3 4 IN1 IN2 CNF2 F.B RNF2 RNF1 GND R1 GNDIN CNF1 RSC RCIN GNDOUT -4- NJM2340 TIPICAL CHARACTERISTICS Oscillator Frequency vs. Timing Resistor (V+=12V,Ta=25C) CT=100pF CT=220pF Oscillator Frequency vs. Timing Capacitor (V+=12V,Ta=25C) 1000 1000 Oscillator Frequency f OSC (kHz) Osillator Frequency f OSC (kHz) RT=47k 100 100 CT=1000pF CT=4700pF RT=20k 10 10 Timing Resistor RT (k) Reference Voltage vs. Output Current (V+=12V,Ta=25C) L Output Voltage VOL (V) 10 RT=100k 10 100 1000 Timing Capacitor CT (pF) L Output Voltage vs. Source Current (V+=12V,Ta=25C) 100 10000 Reference Voltage VREF (V) 2.5 2 1.5 1 0.5 0 0 0.8 0.6 0.4 0.2 0 5 10 15 20 25 30 0 3 6 9 12 15 Output Current IOR (mA) Source Current ISOURCE (mA) Average Quiescent Current ICC (mA) 3 2.5 2 1.5 1 0.5 0 0 Average Quiescent Current (RL= ,duty*cycle=50%,Ta=25C) 10 20 V+ (V) 30 40 -5- NJM2340 TIPICAL CHARACTERISTICS Oscillation Frequency vs. Temperature (V+=12V,RT=27k,CT=220pF) 400 Oscillation Frequency f OSC (kHz) 380 360 340 320 300 Input Threshold Voltage (V) 2 1.6 1.2 0.8 0.4 0 Input Threshold Voltage vs. Temperature (V+=12V) VTH100 VTH0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) 0.5 L Output Voltage VOL (V) 0.4 0.3 0.2 0.1 0 L Level Output Voltage vs. Temperaure (V+=12V,ISINK=10mA) 3 Average Quisent Current ICCAV (mA) 2.5 2 1.5 1 0.5 0 Average Quisent Current vs. Temperature (V+=12V,RL= ,duty*cycle=50%) -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) Reference Voltage 1,2 vs. Temperaure (V+=12V) V B1 Ambient Temperature Ta (C) 153 Reference Voltage1 VB1 (mV) 152 151 150 149 148 147 1.03 Reference Voltage2 VB2 (V) [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. 1.02 1.01 1 V B2 0.99 0.98 0.97 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) -6- |
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