NJM2367 5.5A HIGH POWER DC/DC CONVERTER CONTROLLER IC ■GENERAL DESCRIPTION ■PACKAGE OUTLINE The NJM2367 is a high power DC/DC converter controller inducing basic function of DC/DC converter controller, which consists precision reference voltage, fixed frequency oscillator, high gain error amplifier, precision output switch, cycle-by-cycle current limit, under voltage lockout, and thermal shutdown circuit. The NJM2367 is suitable for step-down converter with few external parts, and realize low power stand-by mode. 12345 NJM2367TA2050 ■FEATURES ●Operating Voltage (7.5V to 40V) ●PWM form Switching Power Supply Control ●Internal High Power Transistor 5.5A (min.) ●Fixed Frequency Oscillator 72kHz (typ.) ●Internal Current Sense Amplifier ●Internal Under Voltage Lockout ●Internal Thermal Shutdown Circuit ●Bipolar Technology ●Package Outline TO-22O(5PIN) NJM2367TLA2050 PIN FUNCTION 1:VFB 2:SW OUT 3:GND 4:V+ 5:STBY (VCOMP) ■BLOCK DIAGRAM 5.5A Power Transistor 4 Current Sense Amplifier 2 Current Circh Transistor Thermal Shutdown Reference Voltage ON/OFF Oscillator S VREF Q R Ratch Circuit Under Voltage Lockout PWM Comparator VREF 1 Standby Circuit Error Amplifier 5 3 Ver 2.1 - 1 - NJM2367 ■ABSOLUTE MAXIMUM RATINGS (Ta=25°C ) PARAMETER SYMBOL Maximum Supply Voltage V+ Switch Output Voltage Vo (SWITCH) Voltage Feedback and VFB,VCOMP Compensation Input Voltage Range Power Dissipation PD Operating Junction Temperature Operating Temperature Range Storage Temperature Range Tj Topr Tstg RATINGS 40 -0.5 ∼ +Vin UNIT V V -0.3 ∼ +7.0 V TO-220 (5PIN) 16(TC 46°C) -40 ∼ +150 -40 ∼ +85 -50 ∼ +150 ■THERMAL CHARACTERISTICS Junction-to-Ambient Temperature Thermal Resistance Junction-to-Case θja θjc 70 6.5 W °C °C °C °C/W ■POWER DISSIPATION vs. AMBIENT TEMPERATURE (Topr=-40~+85°C, Tj= ~+150°C, PD=16W(TC 46°C)) 18 Power Dissipation PD (W) 16 Heat Sink 14 12 θHS=5°C/W 10 8 6 θHS=10°C/W θHS=20°C/W 4 2 Without Heat Sink 0 25 -2- 50 75 Ambient Temperature Ta (°C) 100 NJM2367 ■ELECTRICAL CHARACTERISTICS (V+=12V, Ta=25°C) OSCILLATOR BLOCK PARAMETER Frequency ERROR AMPLIFIER BLOCK PARAMETER Voltage Feedback Input Threshold Line Regulation Input Bias Current Ripple Rejection Output Voltage Swing SYMBOL fosc TEST CONDITIONS + V =7.5V SYMBOL TEST CONDITIONS VFB(th) REG·Line IB PSRR VOH VOL V+=7.5 ∼ 40V VFB=VFB(th)+0.15V V+=10 ∼ 20V Isource=75μA,VFB=4.7V Isink=0.4mA,VFB=5.3V PWM COMPARATOR BLOCK PARAMETER SYMBOL Duty Cycle Maximum Minimum SWITCH OUTPUT BLOCK PARAMETER Output Voltage Saturation OFF-State Leakage Current Limit Threshold Switching Times Output Voltage Rise Time Output Voltage Fall Time DC(MAX) DC(MIN) TEST CONDITIONS VFB=0V VFB=5.3V SYMBOL TEST CONDITIONS + VSAT V =7.5V,Isource=5.5A Isw(off) V+=40V,SW OUT=0V Ipk(SWITCH) V+=7.5V tr tf V+=40V,ROUT=7.7Ω,VFB=0V V+=40V,ROUT=7.7Ω,VFB=0V UNDER VOLTAGE LOCKOUT BLOCK PARAMETER SYMBOL Startup Threshold Hysteresis TOTAL DEVICE PARAMETER VTH(UVLO) VH(UVLO) SYMBOL TEST CONDITIONS + V Increasing V+ Decreasing TEST CONDITIONS MIN. TYP. MAX. UNIT 65 72 79 kHz MIN. TYP. MAX. UNIT 4.9 5.0 5.1 V – – – 4.2 – 0.03 0.15 80 4.9 1.6 0.08 1.0 – – 1.9 %/V μA dB V V MIN. TYP. MAX. UNIT – 0 95 0 – 0 % % MIN. TYP. MAX. UNIT + + – – 5.5 V -1.5 0 6.5 V -1.8 100 8.0 V μA A – – 100 50 – – nS nS MIN. TYP. MAX. UNIT 5.9 0.6 6.3 0.8 6.7 1.0 V V MIN. TYP. MAX. UNIT Standby-State Icc(stby) STBY 0.1V – 36 100 Power Supply Current Operating-State Icc V+=40V,VFB=0V – 40 53 Power Supply Current duty·cycle=MAX Keep the limit of maximum power dissipation not to operate thermal shutdown. Low duty cycle pulse test is used to close its junction temperature to ambient temperature. μA mA -3- NJM2367 ■TIPICAL CHARACTERISTICS Output Saturation Voltage VSAT(ERROR) (V) Switch Output Saturation Voltage VSAT (V) 0 Switch Output Saturation Voltage vs. + Output Source Current (V =7.5V,Ta=25℃) -0.5 -1 -1.5 -2 -2.5 1.2 0.8 0.4 0 2 4 6 8 10 Output Source Current ISOURCE (A) Standby-State Power Supply Curret vs. Supply Voltage (Ta=25°C) 120 90 60 30 0.4 0.8 1.2 1.6 Output Sink Current ISINK (mA) 2 Duty Cycle vs. Compensation Voltage + (V =12V,Ta=25°C) 100 Duty Cycle DC (%) Standby-State Power Supply Current ICC(stby) (μA) 0 80 60 40 20 0 0 0 -4- 1.6 0 -3 150 2 Error AMP Block Output Saturation Voltage vs. Output Source Current + (V =12V,VFB=5.5V,Ta=25°C) 5 10 15 20 25 30 35 + Supply Voltage V (V) 40 0 1 2 3 4 Compensation Voltage VCOMP (V) 5 NJM2367 ■TIPICAL CHARACTERISTICS 5.05 5 4.95 4.9 -50 -25 0 25 50 0.3 0.2 0.1 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) 75 100 125 150 Ambient Temperature Ta (°C) Oscillator Frequency vs. Temperature + (V =12V) 9 Current Limit Threshold Ipk(SWITCH) (A) Oscillator Frequency f OSC (kHz) 80 75 70 65 -50 -25 0 25 50 8 7 6 -50 -25 75 100 125 150 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) Ambient Temperature Ta (°C) Under Voltage Lockout Threshold vs. Temperature Operating-State Power Supply Current vs. Temperature + (V =40V,VFB=0V,Dudy Cycle=MAX) 60 Startup Threshold V+ Increasing 7 6 5 Startup Threshold V+ Decreasing Power Supply Current ICC (mA) Under Voltage Lockout Threshold VTH(UVLO) (V) Current Limit Threshold vs. Temperature + (V =7.5V) 5 60 8 Error AMP Block Input Bias Current vs. + Temperaure (V =12V,VFB=VFB(th)+0.15V) 0.4 Input Bias Current IB (μA) Voltage Feedback Input Threshold VFB (V) 5.1 Voltage Feedback Input Threshold vs. + Temperature (V =12V) 50 40 30 20 10 0 4 -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) -5- NJM2367 ■TYPICAL APPLICATIONS Step-Down Converter *SBD L Vin 4 Cin 2 NJM2367 3 Vout R2 1 5 CF SBD Cout R1 RF 1) 5V and higher converter, the application must be connected R1 resistor according to above figure. 2) High current converter, the application must be placed Cin capacitor next to NJM2367, which avoid the power-line fluctuation. 3) The sharp fluctuation of output load cause reverse voltage for inductance and over the supply-voltage for SW OUT terminal. To avoid this problem, the application must be placed SBD between terminal 2 and 4. ■TIMING CHART ① Oscillator Compensation ON ② Switch output OFF ON Current sense OFF ③ ON Thermal shutdown ④ OFF 1) The NJM2367 generate square waves. The PWM comparator generate PWM signals to compare square waves and compensation voltage. 2) The switching duty is maximum 95%. 3) Over the 6.5A current, the output switch will be OFF to operate current limit protection. The NJM2367 sense the switching current of power transistor. 4) Over the 180°C (Tj), the switching will be OFF to operate thermal shutdown circuit. -6- NJM2367 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. -7-