NJM2368 SWITCHING REGULATOR CONTROL IC FOR FLYBACK GENERAL DESCRIPTION PACKAGE OUTLINE The NJM2368 is a high speed switching regulator control IC which can operate at low voltage. It uses a totempole output circuit , so that it can drive an external Bipolar Transistor directly. It is suitable for applications of flyback type switching regulation of up to 10W. FEATURES Operating Voltage Wide Oscillator Range Soft-Start function. Under Voltage Lockouts Bipolar Technology Package Outline (3.6V ~ 32V) (5kHz ~ 350 kHz) NJM2368D ( DIP8 ) NJM2368M ( DMP8 ) NJM2368E ( SOP8 ) NJM2368V ( SSOP8 ) (U.V.L.O.) DIP8, DMP8, SOP8 JEDEC 150mil, SSOP8 BLOCK DIAGRAM REF 8 CT CS V+ 7 6 5 30uA VREF OSC L.O U.V.LO 500 S.C.P ERAMP 0.52V PWM 1 2 - F.B IN Ver.2011-12-22 3 GND PIN FUNCTION 1. IN2. F.B 3. GND 4. OUT 5. V+ 6. CS 7. CT 8. REF 4 OUT -1- NJM2368 ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL Input Voltage V+ Reference Output Current IOR Output Current IO Power Dissipation PD Operating Temperature Range Storage Temperature Range TOPR TSTG MAXIMUM RATINGS 36 10 50 (DIP 8) 700 (DMP 8) 300 (SOP 8) 300 (SSOP 8) 250 -40 ~ +85 -50 ~ 125 RECOMMENDED OPERATING CONDITIONS (V+=6V, Ta=25C) PARAMETER SYMBOL RATINGS Operating Voltage V+ Feed Back Resistor RNF Oscillator Timing Capacitor CT Oscillator Timing Resistor RT Oscillate fOSC UNIT V mA mA mW C C MIN. 3.6 100 220 22 5 MAX. 32 - 22,000 100 350 UNIT V k pF k kHz ELECTRICAL CHARACTERISTICS (V+=6V, RT=33k, CT=1,000pF, Ta=25C) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL Output Voltage Line Regulation Load Regulation OSCILLATOR BLOCK PARAMETER Oscillate Oscillate Fluctuations1 (Line Fluctuations) Oscillate Fluctuations2 (Temp Fluctuations) ERROR AMPLIFIER BLOCK PARAMETER Reference Voltage Input Bias Current Open Loop Gain Gain Band width Product Maximum Output Voltage (F.B Pin) Output Source Current (F.B Pin) -2- VREF LINE LOAD RATINGS MIN. TYP. MAX. UNIT 2.45 - - 2.50 6.8 5 2.55 20.7 30 V mV mV MIN. TYP. MAX. UNIT CT=1,000pF, RT=33k 85 105 125 kHz V+=3.6V ~ 32V - 1 - % Ta=-40C ~ +85C - 5 - % MIN. TYP. MAX. UNIT 0.51 - - - VREF-0.2 - 0.52 5 90 0.6 - - 0.53 100 - - - 200 V nA dB MHz V mV 40 85 200 uA IOR=1mA V+=3.6V ~ 32V, IOR=1mA IOR=0.1mA ~ 5.0mA SYMBOL fosc fdv fdt RATINGS SYMBOL RATINGS VB IB AV GB VOM+ VOM- RNF=100k RNF=100k IOM+ VOM=1V Ver.2011-12-22 NJM2368 ELECTRICAL CHARACTERISTICS (V+=6V, RT=33k, CT=1,000pF, Ta=25C) PWM COMPARATE BLOCK PARAMETER Input Threshold Voltage (F.B Pin) Input Threshold Voltage (F.B Pin) Maximum Duty Cycle SYMBOL UNDER VOLTAGE LOCKOUT PARAMETER ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage TYP. MAX. UNIT dutycycle=0% - 0.55 0.65 V VTH50 dutycycle=50% - 0.87 - V F.B Pin=1.2V 55 64 85 % MIN. TYP. MAX. UNIT - 250 650 nA - 0.25 0.35 V - 0.52 - V MIN. TYP. MAX. UNIT 1.20 1.50 1.80 V 10 30 50 uA 1.20 1.50 1.80 V MIN. TYP. MAX. UNIT - - 60 2.70 2.52 180 - - - V V mV MIN. TYP. MAX. UNIT 3.50 - 4.00 0.25 - 0.65 V V 8 11 - mA MIN. TYP. MAX. UNIT - - 1.6 3.5 2.2 4.8 mA mA M RATINGS IBCS VTHCS0 dutycycle=0% VTHCS50 dutycycle=50% SHORT CIRCUIT PROTECTION PARAMETER SYMBOL Input Threshold Voltage (F.B Pin) Charge Current (CS Pin) Latch mode Threshold Voltage (CS Pin) MIN. VTH0 SOFT START CIRCUIT BLOCK PARAMETER SYMBOL Input Bias Current (CS Pin) Input Threshold Voltage (CS Pin) Input Threshold Voltage (CS Pin) RATINGS RATINGS VTHPC ICHG CS Pin=0V, F.B Pin=2V VTHLA SYMBOL RATINGS VTHON VTHOFF VHYS OUTPUT PARAMETER SYMBOL H-Output Voltage (OUT Pin) L-Output Voltage (OUT Pin) Output Source Current (OUT Pin) VOH VOL GENERAL CHARACTERISTIC PARAMETER Quiescent Current Average Quiescent Current Ver.2011-12-22 ISOURCE SYMBOL ICCLA ICCAV RATINGS RL=10k Output Sink Current =20mA OUT Pin=0V RATINGS Latch Mode RL=, dutycycle=50% -3- NJM2368 TYPICAL APPLICATIONS + V Rsf 330k Rsr Cs 180k 4.7uF CT 1,000pF RT 36k 8 7 6 VOUT +5V D1 5 30uA VREF OSC L.O U.V.LO 500 CIN N1 S.C.P R2 22k N2 ERAMP 0.52V PWM COUT 1 2 3 4 R1 2.2k CLP 2,200pF GND RNF 1M 2k Q1 *100k GND When Short Circuit Protection (SCP) is activated, Output terminal (Pin 4) becomes high impedance and the external switching transistor (Q1) is turned off. However, small leak current from Output terminal at high ambient temperature may turn on the external switching transistor causing malfunction of the SCP particularly when FET is used as a switching device. To avoid this issue, insert a 100k resistor between the Gate and the Source of the external transistor. -4- Ver.2011-12-22 NJM2368 TYPICAL CHARACTERISTICS H Output Voltage vs. Source Current + + (V =6V, RT=33k, CT=1,000pF, Ta=25 C) 7 6 5 4 3 2 1 0 0 2 4 6 Source Current I 8 SOURCE 10 (mA) 0.8 0.6 0.4 0.2 0 12 Oscillator Frequency vs. Timing Resistor + (kHz) (kHz) Oscillator Frequency f 100 Timing Resistor R (k) RT=33k 10 RT=100k 1 10 100 1000 10000 Timing Capacitor C (pF) Operating Current vs. Operating Voltage o (Ta=25 C) Operating Current ICC (mA) Reference Voltage VREF (V) 2.5 2.49 Ver.2011-12-22 (Ta=25oC) 6 2.51 10 20 30 Operating Voltage V+ (V) 100000 T Reference Voltage vs. Operating Voltage 0 o 100 T 2.48 60 (V =6V, Ta=25 C) 1000 OSC OSC Oscillator Frequency f CT=1,000pF 2.52 20 30 40 50 Sink Current ISINK (mA) + 100 1 10 10 Oscillator Frequency vs. Timing Capacitor CT=470pF 10 0 o (V =6V, Ta=25 C) 1000 (V =6V, RT=33k, CT=1,000pF, Ta=25oC) 1 L Output Voltage VOL (V) H Output Voltage VOH (V) 8 L Output Voltage vs. Sink Current o 40 ICCAV 5 4 3 ICCLA 2 1 0 0 10 20 30 Operating Voltage V+ (V) 40 -5- NJM2368 TYPICAL CHARACTERISTICS Oscillator Frequency vs. Temperature Referece Voltage vs. Temperature + 140 120 100 80 60 -50 2.8 2.6 2.4 2.2 2 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) + (V =6V, ISINK =20mA, RT=33k, CT=1,000pF) 0.5 L Output Voltage VOL (V) H Output Voltage VOH (V) (V =6V, RL=10k, RT=33k, CT=1,000pF) 10 6 4 2 0 -50 0.2 0.1 Quiescent Current ICCLA (mA) 1.8 1.6 1.4 1.2 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Average Quiescent Current vs. Temperature + (V =6V, RL=, duty cycle=50%, RT=33k, CT=1,000pF) 5 Average Quiescent Current ICCAV (mA) (Latch Mode, V =6V, RT=33k, CT=1,000pF) 2 -6- 0.3 0 -50 Quiescent Current vs. Temperature 1 -50 0.4 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) + -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) L Output Voltage vs. Temperature H Output Voltage vs. Temperature + 8 (V =6V, IOR=1mA) 3 Referece Voltage VREF (V) Oscillator Frequency fOSC (kHz) + (V =6V, RT=33k, CT=1,000pF) 160 4 3 2 1 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Ver.2011-12-22 NJM2368 TYPICAL CHARACTERISTICS Maximum Duty Cycle vs. Oscillator Frequency (V+=6V, Ta=25oC) Maximum Duty Cycle M (%) 80 70 60 50 40 30 20 10 0 10 100 1000 Oscillator Frequency fOSC (kHz) Duty Cycle vs. CS Pin Voltage (V+=6V, Ta=25oC) 80 Duty Cycle (%) 70 60 50 40 30 20 10 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 CS Pin Voltage VTHCS (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. Ver.2011-12-22 -7- Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: NJR: NJM2368V-TE1 NJM2368V-TE2 NJM2368E-TE2 NJM2368E-TE1 NJM2368M NJM2368E NJM2368D NJM2368M-TE2 NJM2368M-TE1