NJU7620 Step-Up/Flyback Switching Regulator IC with Constant Current Control GENERAL DESCRIPTION PACKAGE OUTLINE The NJU7620 is a low voltage operation high-speed switching regulator control IC for step-up and flyback converter, with a constant current control. It incorporates a totem pole output, which can drive an external MOS-FET easily. It also incorporates error amplifier and current sense amplifier, which can allow the constant voltage/current control for output voltage. Therefore the NJU7620 is suitable for a LED driving and other CCCV applications up to 10W. The NJU7620 is available in a small and thin 8-lead MSOP (TVSP) package. FEATURES PWM switching control Constant Current Control Operating Voltage 2.2V to 8V Wide Oscillator Range 300kHz to 1MHz Maximum Duty Cycle 90% typ. Quiescent Current 800A typ. Soft-Start Function Internal : 16ms typ. or adjustable Dead Time Control C-MOS Technology Package Outline NJU7620RB1 : MSOP8 (TVSP8)* NJU7620RB1 (MSOP8 (TVSP8)) PRODUCT VARIATION NJU7620 Constant Current Control NJU7610 Over Current Protection NJU7600 PWM Control *MEET JEDEC MO-187-DA / THIN TYPE PIN CONFIGURATION 1 8 2 7 3 6 4 5 NJU7620RB1 Ver.2012-08-03 PIN FUNCTION 1. V+ 2. FB 3. IN-1 4. IN-2 5. DTC 6. RT 7. GND 8. OUT -1- NJU7620 BLOCK DIAGRAM + V FB 0.8V Error AMP IN-1 -1 0.2V 1V Soft Start IN-2 -1 UVLO 0.2V Current Sense AMP PWM Buffer OUT OSC 0.5V 0.5 RT 0.74V A DTC RT GND RT -2- Ver.2012-08-03 NJU7620 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage V+ Output Pin Current IO Power Dissipation PD Operating Temperature Range TOPR Storage Temperature Range TSTG MAXIMUM RATINGS +9 50 MSOP8 (TVSP8) :320 -40 to +85 -40 to +125 RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL MIN. Operating Voltage V+ 2.2 Oscillator Timing Resistor RT 30 Oscillation Frequency fOSC 300 TYP. - 47 700 Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage Soft Start Block Soft Start Time Oscillator Block RT Pin Voltage Oscillation Frequency Oscillate Supply Voltage Fluctuations Oscillate Temperature Fluctuations Ver.2012-08-03 SYMBOL VT_ON VT_OFF VHYS TSS (Ta=25C) UNIT V k kHz MAX. 8 120 1,000 (V+=3.3V, RT=47k, Ta=25C) ELECTRICAL CHARACTERISTICS PARAMETER (Ta=25C) UNIT V mA mW C C TEST CONDITION V+= L H V+= H L VT_ON Duty=80% VRT fOSC MIN. TYP. MAX. UNIT 1.9 1.8 60 2.0 1.9 100 2.1 2.0 - V V mV 8 16 24 ms -5% 630 0.5 700 +5% 770 V kHz fDV V+=2.2V to 8V - 1 - % fDT Ta=-40C to +85C - 3 - % -3- NJU7620 ELECTRICAL CHARACTERISTICS (V+=3.3V, RT=47k, Ta=25C) PARAMETER Error Amplifier Block Reference Voltage 1 Input Bias Current 1 Open Loop Gain 1 Gain Bandwidth Product 1 Output Source Current 1 SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT -1.5% -0.1 - - 25 1.00 - 80 1 55 +1.5% 0.1 - - 95 V A dB MHz mA 4 9 16 mA 0.10 0.16 0.22 mA VFB=1V, VIN-1=0.9V, VIN-2=0.3V -10% -0.1 - - 0.10 0.2 - 70 1 0.16 +10% 0.1 - - 0.22 V A dB MHz mA Duty=0% Duty=50% VFB=0.9V VFB=0.9V, RDTC=47k 0.16 0.44 85 40 0.22 0.5 90 50 0.28 0.56 95 60 V V % % VB1 IB1 AV1 GB1 IOM+_1 IOM+_2 Output Sink Current 1 IOM1- Current Sense Amplifier Block Reference Voltage 2 Input Bias Current 2 Open Loop Gain 2 Gain Bandwidth Product 2 Output Sink Current 2 VB2 IB2 AV2 GB2 IOM2- VFB=1V, VIN-1=0.9V, VIN-2=0.1V VFB=1V, VIN-1=0.9V, VIN-2=0.1V, V+=2.2V VFB=1V, VIN-1=1.1V, VIN-2=0.1V PWM Comparate Block Input Threshold Voltage Maximum Duty Cycle Output Block Output High Level ON Resistance Output Low Level ON Resistance General Characteristics Quiescent Current -4- VT_0 VT_50 MAXDUTY_1 MAXDUTY_2 ROH IO=-20mA - 10 20 ROL IO=+20mA - 5 10 RL=Non Load - 800 1200 A IDD Ver.2012-08-03 NJU7620 TYPICAL APPLICATIONS Step-Up Converter SBD L + V VOUT CIN NJU7620 C CCNF R2 + V OUT 8 2 FB GND 7 3 IN-1 RT 6 4 IN-2 DTC 5 R1 CNF RCNF COUT FET 1 GNDOUT RSC RT RNF RDTC CS RCIN Flyback Converter T + V SBD VOUT CIN NJU7620 C CCNF RCNF R2 1 V 2 + FET OUT 8 FB GND 7 3 IN-1 RT 6 4 IN-2 DTC 5 CNF GNDOUT COUT R1 RSC RT RNF RDTC CS RCIN Ver.2012-08-03 -5- NJU7620 TYPICAL CHARACTERISTICS Oscillation Frequency vs. Timing Resistance + + (V =3.3V, Ta=25 C) 90 AX UTY_1 95 100 10 85 80 100 100 Timing Resistance RT (k) Duty Cycle vs. R DTC 100 T 720 700 680 660 2 4 6 8 + Operating Voltage V (V) 10 (V =3.3V, R =47k, Ta=25 C) T 80 60 40 20 0 0 o + Duty Cycle MAXDUTY (%) Oscillation Frequency fosc (kHz) (R =47k, Ta=25oC) 740 1000 Oscillator Frequency fOSC (kHz) Oscillation Frequency vs. Operating Voltage -6- o (V =3.3V, Ta=25 C) 100 Maximum Duty Cycle M D (%) 1000 Oscillation Frequency fOSC (kHz) Maximum Duty Cycle vs. Oscillator Frequency o 0 20 40 60 80 100 Dead Time Control Resistance RDTC (k) Ver.2012-08-03 NJU7620 TYPICAL CHARACTERISTICS (V) 0.998 0 2 4 6 8 + Operating Voltage V (V) 0.202 0.2 0.198 0.196 10 (R =47k, R =Non Load, Ta=25oC) T 60 Voltage Gain Av (dB) L 1200 1000 800 600 400 2 4 6 8 + Operating Voltage V (V) Error Amplifier Block Voltage Gain, Phase vs. Frequency (V+=3.3V, Gain=40dB, Ta=25 oC) Quiescent Current vs. Operating Voltage 1400 0 Phase 45 10 180 135 Gain 30 90 15 45 Phase (deg) 1 Quiescent Current IDD (A) (Ta=25oC) 0.204 B2 Reference Voltage2 V Reference Voltage1 V 1.002 0.996 Current Sense Amplifier Block Reference Voltage2 vs. Operating Voltage (Ta=25oC) 1.004 B1 (V) Error Amplifier Block Reference Voltage1 vs. Operating Voltage 200 0 0 Ver.2012-08-03 2 4 6 8 + Operating Voltage V (V) 10 0 0.1 1 10 100 1000 Frequency f (kHz) 0 10000 -7- NJU7620 TYPICAL CHARACTERISTICS Output High Level ON Resistance ROH () 14 + V =1.95V 12 8 V+=3.3V 6 4 V+=8V 2 0 -50 Output Source Current I 12 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Error Amplifier Block Output Source Current1 vs. Temperature (VFB=1V, VIN-1 =0.9V, VIN-2 =0.1V) Output Sink Current IOM- (mA) 1000 Output Block Output Low Level ON Resistance vs. Temperature (Io=+20mA) V+=1.95V 10 V+=8V OM+ (mA) 10 14 Output Low Level ON Resistance ROL () Output Block Output High Level ON Resistance vs. Temperature (Io=-20mA) 100 V+=3.3V 10 V+=1.95V 1 -50 8 V+=3.3V 6 4 2 0 -50 V+=8V -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Error Amplifier, Current Sense Amplifier Block Output Sink Current vs. Temperature 0.2 0.15 V+=1.95V, 3.3V, 8V 0.1 0.05 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Soft Start Time vs. Temperature Soft Start Time Tss (ms) 24 22 20 18 16 14 12 10 8 -50 -8- (V+=3.3V) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Ver.2012-08-03 NJU7620 TYPICAL CHARACTERISTICS Current Sense Amplifier Block Reference Voltage2 vs. Temperature Error Amplifier Block Reference Voltage1 vs. Temperature (V+=3.3V) (V) Reference Voltage2 VB2 (V) 1.01 0.205 B1 Reference Voltage1 V (V+=3.3V) 0.21 1.005 1 0.2 0.195 0.995 0.99 -50 0.19 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Oscillator Frequency vs. Temperature -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Muximum Duty Cycle vs. Temperature 760 80 700 60 660 Ver.2012-08-03 40 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) VT_ON VT_OFF -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) Quiescent Current vs. Temperature Under Voltage Lockout Block vs. Temperature 1.94 1.86 -50 MAX DUTY_2 50 2.02 1.9 MAX DUTY_1 70 680 1.98 (V+=3.3V) 90 720 640 -50 100 Muximum Duty Cycle MAX DUTY (%) 740 2.06 Threshold Voltage (V) (V =3.3V, RT=47k) 1000 Quiescent Current IDD (A) Oscillator Frequency fOSC (kHz) + (V+=3.3V, RT=47k) 800 600 400 200 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) -9- NJU7620 MEMO [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. - 10 - Ver.2012-08-03