NJW4132U2-A-TE2

NJW4132 Switching Regulator IC for Boost Converter Current Mode Control w/ 45V/1.75A MOSFET GENERAL DESCRIPTION ■ PACKAGE OUTLINE The NJW4132 is a boost converter with 45V/1.75A MOSFET. It corresponds to high oscillating frequency, and Low ESR Output Capacitor (MLCC) within wide input range from 4.5V to 40V. Therefore, the NJW4132 can realize downsizing of applications with a few external parts so that adopts current mode control. Also, it has a soft start function, external clock synchronization, over current protection and thermal shutdown circuit. It is suitable for boost application to a Car Accessory, Office Automation Equipment, Industrial Instrument and so on. NJW4132U2 FEATURES Current Mode Control External Clock Synchronization Wide Operating Voltage Range 4.5V to 40V Switching Current 1.75A min. PWM Control Built-in Compensation Circuit Correspond to Ceramic Capacitor (MLCC) Oscillating Frequency 300kHz typ. (A ver.) 700kHz typ. (B ver.) 2.0MHz typ. (C ver.) Soft Start Function 10ms typ. UVLO (Under Voltage Lockout) Over Current Protection (Hiccup type) Thermal Shutdown Protection Standby Function Package Outline NJW4132U2 : SOT-89-5-2 PRODUCT CLASSIFICATION Version Oscillation Frequency Package NJW4132U2-A A 300kHz typ. SOT-89-5-2 NJW4132U2-B B 700kHz typ. SOT-89-5-2 NJW4132U2-C C 2.0MHz typ. SOT-89-5-2 Part Number Ver.2017-01-25 Operating Temperature Range General Spec. -40 C to +85 C General Spec. -40 C to +85 C General Spec. -40 C to +85 C -1- NJW4132 PIN CONFIGURATION 5 (2) 4 PIN FUNCTION 1. SW 2. GND 3. IN4. EN/SYNC 5. V+ 1 2 3 NJW4132U2 BLOCK DIAGRAM V+ SW UVLO TSD EN/SYNC Enable (Standby) High: ON Low : OFF(Standby) 100k SYNC S Q OSC Buffer R Low Frequency Control PWM INER AMP Soft Start Vref OCP CURRENT SENSE 1V SLOPE COMP. GND -2- Ver.2017-01-25 NJW4132 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage V+ SW pin Voltage VSW IN- pin Voltage VINEN/SYNC pin Voltage VEN/SYNC Power Dissipation PD Junction Temperature Range Operating Temperature Range Storage Temperature Range Tj Topr Tstg MAXIMUM RATINGS +45 +45 -0.3 to +6 +45 SOT-89-5-2 625 (*1) 2,400 (*2) -40 to +150 -40 to +85 -40 to +150 (Ta=25°C) UNIT V V V V mW C C C (*1): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JEDEC standard, 2Layers) (*2): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JEDEC standard, 4Layers) (For 4Layers: Applying 74.2×74.2mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5) RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL Supply Voltage V+ External Clock Input Range A version fSYNC B version C version Ver.2017-01-25 MIN. 4.5 TYP. – MAX. 40 290 690 1,800 – – – 500 1,000 2,400 UNIT V kHz -3- NJW4132 (Unless otherwise noted, V+=VEN./SYNC=12V, Ta=25 C) ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage VT_ON VT_OFF VHYS TSS Soft Start Block Soft Start Time TEST CONDITION MIN. TYP. MAX. UNIT V+= L → H V+= H → L 4.2 4.1 70 4.35 4.25 100 4.5 4.4 – V V mV VB=0.95V 5 10 15 ms 270 630 1.82 – – – 300 700 2.0 50 117 410 330 770 2.2 – – – kHz kHz MHz kHz kHz kHz Oscillator Block Oscillation Frequency fOSC Oscillation Frequency OCP operates fOSC_LIM Oscillation Frequency deviation (Supply voltage) Oscillation Frequency deviation (Temperature) Error Amplifier Block Reference Voltage Input Bias Current A version, VIN-=0.9V B version, VIN-=0.9V C version, VIN-=0.9V A version, VIN-=0.4V B version, VIN-=0.4V C version, VIN-=0.4V fDV V+=4.5V to 40V – 1 – % fDT Ta=-40 C to +85 C – 5 – % -1.0% -0.1 1.0 – +1.0% 0.1 V A 85 80 – – – – – – 90 85 300 110 80 220 90 80 – – 425 155 120 355 125 120 % % ns ns ns ns ns ns – 42 – ms – 1.75 – 0.4 2.1 – 0.65 2.25 1 A A VB IB PWM Comparate Block Maximum Duty Cycle MAXDUTY Minimum ON Time1 (Use Built-in Oscillator) tON-min1 Minimum ON Time2 (Use Ext CLK) tON-min2 OCP Block COOL DOWN Time tCOOL Output Block Output ON Resistance Switching Current Limit SW Leak Current RON ILIM ILEAK -4- A version, B version, VIN-=0.9V C version, VIN-=0.9V A version B version C version A version, fSYNC=400kHz B version, fSYNC=800kHz C version, fSYNC=2.2MHz ISW=1A VEN/SYNC=0V, VSW=45V Ver.2017-01-25 NJW4132 ELECTRICAL CHARACTERISTICS PARAMETER Standby Control Block ON Control Voltage OFF Control Voltage Input Bias Current (EN/SYNC pin) SYMBOL VON VOFF IEN (Unless otherwise noted, V+=VEN/SYNC=12V, Ta=25 C) TEST CONDITION VEN/SYNC= L → H VEN/SYNC= H → L A version, B version, VEN/SYNC=12V C version, VEN/SYNC=12V MIN. TYP. MAX. UNIT 1.6 0 – – V+ 0.5 V V – 165 300 A – 250 400 A – 2.1 2.65 mA – 2.5 3.0 mA – 3.5 4.0 mA – – 1 A General Characteristics Quiescent Current Standby Current Ver.2017-01-25 IDD IDD_STB A version, RL=no load, VIN-=0.9V B version, RL=no load, VIN-=0.9V C version, RL=no load, VIN-=0.9V VEN/SYNC=0V -5- NJW4132 TYPICAL APPLICATIONS Boost Converter V IN L CIN SBD COUT V OUT CFB R2 RFB V+ SW NJW4132 EN/ SYNC GND R1 IN- EN/SYNC High: ON Low: OFF (Standby) Buck-Boost (SEPIC) Converter V IN L1 CIN C1 SBD COUT V OUT CFB R2 RFB V+ SW NJW4132 EN/ SYNC GND L2 R1 IN- EN/SYNC High: ON Low: OFF (Standby) -6- Ver.2017-01-25 NJW4132 TYPICAL CHARACTERISTICS (A, B, C version) Reference Voltage vs. Supply Voltage (Ta=25°C) Reference Voltage VB (V) 1.01 1.005 1 0.995 0.99 Switching Current Limit I LIM (A) 1 0.995 0.99 0 2.8 1.005 10 20 30 Supply Voltage V+ (V) 40 -50 Switching Current Limit vs. Temperature 2.6 2.4 + V =4.5V, 12V, 40V 2.2 2 1.8 1.6 1.4 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) Output ON Resistance vs. Temperature (ISW=1A) 0.8 Output ON Resistance RON (W) Reference Voltage VB (V) 1.01 Reference Voltage vs. Temperature (V+=12V) 0.7 0.6 V+=4.5V, 12V, 40V 0.5 0.4 0.3 0.2 0.1 0 -50 Ver.2017-01-25 -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) -7- NJW4132 TYPICAL CHARACTERISTICS (A, B, C version) Under Voltage Lockout Voltage vs. Temperature 4.5 15 14 VT_ON 4.4 4.35 4.3 VT_OFF 4.25 4.2 Soft Start Time Tss (ms) Threshold Voltage (V) 4.45 13 12 11 10 9 8 7 4.15 6 4.1 5 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) 2.5 2 1.5 1 0.5 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) Standby Current vs. Temperature (VEN/SYNC=0V) 1 Standby Current IDD_STB (μA) Switching Leak Current I LEAK (μA) -50 Switching Leak Current vs. Temperature (V+=12V, VEN/SYNC=0V, VSW=45V) 3 0.9 0.8 0.7 0.6 0.5 V+=40V V+=12V V+=4.5V 0.4 0.3 0.2 0.1 0 0 -50 -8- Soft Start Time vs. Temperature (V+=12V, VB=0.95V) -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) Ver.2017-01-25 NJW4132 TYPICAL CHARACTERISTICS (A version) Oscillation Frequency vs. Supply Voltage (A ver., VIN-=0.9V, Ta=25°C) 3 315 Quiescent Current IDD (mA) Oscillation Frequnecny fOSC (kHz) 320 310 305 300 295 290 285 280 10 20 30 Supply Voltage V+ (V) 2 1.5 1 0.5 40 0 Oscillation Frequency vs Temperature (A ver., V+=12V, VIN-=0.9V) 320 310 300 290 280 270 10 20 30 Supply Voltage V+ (V) 40 Maximum Duty Cycle vs. Temperature (A ver., V+=12V, VIN-=0.9V) 100 Maximum Duty Cycle MAXDUTY (%) 330 Oscillation Frequency fosc (kHz) 2.5 0 0 98 96 94 92 90 88 86 84 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) -50 Minimum ON Time1 vs. Temperature (A ver., V+=12V) 400 350 300 250 200 150 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) Quiescent Current vs. Temperature (A ver., RL=no load, VIN-=0.9V) 3 Quiescent Current IDD (mA) 450 Minimum ON Time1 tON-min1 (ns) Quiescent Current vs. Supply Voltage (A ver., RL=no load, VIN-=0.9V, Ta=25°C) 2.5 V+=12V, 40V 2 V+=4.5V 1.5 1 0.5 0 -50 Ver.2017-01-25 -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) -9- NJW4132 TYPICAL CHARACTERISTICS (B version) Oscillation Frequency vs. Supply Voltage (B ver., VIN-=0.9V, Ta=25°C) 3 715 Quiescent Current IDD (mA) Oscillation Frequnecny fOSC (kHz) 720 710 705 700 695 690 685 680 2 1.5 1 0.5 40 0 760 740 720 700 680 660 640 620 10 20 30 Supply Voltage V+ (V) 40 Maximum Duty Cycle vs. Temperature (B ver., V+=12V, VIN-=0.9V) 100 Maximum Duty Cycle MAXDUTY (%) Oscillation Frequency fosc (kHz) 10 20 30 Supply Voltage V+ (V) Oscillation Frequency vs Temperature (B ver., V+=12V, VIN-=0.9V) 780 98 96 94 92 90 88 86 84 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) -50 Minimum ON Time1 vs. Temperature (B ver., V+=12V) 180 160 140 120 100 80 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) Quiescent Current vs. Temperature (B ver., RL=no load, VIN-=0.9V) 3 Quiescent Current IDD (mA) Minimum ON Time1 tON-min1 (ns) 2.5 0 0 2.5 V+=4.5V, 12V, 40V 2 1.5 1 0.5 0 60 -50 - 10 - Quiescent Current vs. Supply Voltage (B ver., RL=no load, VIN-=0.9V, Ta=25°C) -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) Ver.2017-01-25 NJW4132 TYPICAL CHARACTERISTICS (C version) Oscillation Frequency vs. Supply Voltage (C ver., VIN-=0.9V, Ta=25ºC) 4 2.08 3.5 Quiescent Current IDD (mA) Oscillation Frequency fOSC (MHz) 2.1 2.06 2.04 2.02 2 1.98 1.96 1.94 3 2.5 2 1.5 1 0.5 1.92 1.9 0 0 40 0 2.1 2 1.9 1.8 1.7 10 20 30 Supply Voltage V+ (V) 40 Maximum Duty Cycle vs. Temperature (C ver., V+=12V, VIN-=0.9V) 100 Maximum Duty Cycle MAXDUTY (%) Oscillation Frequency fOSC (MHz) 10 20 30 Supply Voltage V+ (V) Oscillation Frequency vs. Temperature (C ver., V+=12V, VIN-=0.9V) 2.2 98 96 94 92 90 88 86 84 82 80 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (ºC) -50 Minimum ON Time1 vs. Temperature (C ver., V+=12V) 100 80 60 40 20 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (ºC) Quiescent Current vs. Temperature (C ver., RL=no load, VIN-=0.9V) 4 Quiescent Current IDD (mA) 120 Minimum ON Time1 tON-min1 (ns) Quiescent Current vs. Supply Voltage (C ver., RL=no load, VIN-=0.9V, Ta=25ºC) 3.5 V+=4.5V, 12V, 40V 3 2.5 2 1.5 1 0.5 0 0 -50 Ver.2017-01-25 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (ºC) -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (ºC) - 11 - NJW4132 NJW4132Application Manual Technical Information PIN DESCRIPTIONS SW GND PIN NUMBER 1 2 IN- 3 EN/SYNC 4 V+ 5 PIN NAME - 12 - FUNCTION Switch Output pin of Power MOSFET GND pin Output Voltage Detecting pin Connects output voltage through the resistor divider tap to this pin in order to voltage of the IN- pin become 1.0V. Standby Control pin The EN/SYNC pin internally pulls down with 100k . Normal Operation at the time of High Level. Standby Mode at the time of Low Level or OPEN. Moreover, it operates by inputting clock signal at the oscillatory frequency that synchronized with the input signal. Power Supply pin for Power Line Ver.2017-01-25 NJW4132 ApplicationNJW4132 Manual Technical Information Description of Block Features 1. Basic Functions / Features Error Amplifier Section (ER AMP) 1.0V±1% precise reference voltage is connected to the non-inverted input of this section. To set the output voltage, connects converter's output to inverted input of this section (IN- pin). If requires output voltage, inserts resistor divider. Because the optimized compensation circuit is built-in, the application circuit can be composed of minimum external parts. PWM Comparator Section (PWM), Oscillation Circuit Section (OSC) The NJW4132 uses a constant frequency, current mode step up architecture. The oscillation frequency are 300kHz (typ.) at A version, 700kHz (typ.) at B version and 2.0MHz (typ.) at C version. The PWM signal is output by feedback of output voltage and slope compensation switching current at the PWM comparator block. The maximum duty ratio is 90% (typ.) in A version and B version. Minimum ON time is limited in the inside of the IC. (Table 1.) Table 1. Minimum ON time of NJW4132 A version (fOSC =300kHz) Use Built-in 300ns typ. Oscillator Use External 220ns typ. Clock (@ fSYNC=400kHz) B version (fOSC =700kHz) C version (fOSC =2.0MHz) 110ns typ. 80ns typ. 90ns typ. (@ fSYNC=800kHz) 80ns typ. (@ fSYNC=2.2MHz) The boost converter of ON time is decided the following formula. ton 1 VIN VOUT 1 f OSC s VIN shows input voltage and VOUT shows output voltage. When the ON time becomes below in tON-min, in order to maintain output voltage at a stable state, change of duty or pulse skip operation may be performed. Power MOSFET (SW Output Section) The power is stored in the inductor by the switch operation of built-in power MOSFET. The output current is limited to 1.75A(min.) the overcurrent protection function. Power Supply, GND pin (V+ and GND) In line with switching element drive, current flows into the IC according to frequency. If the power supply impedance provided to the power supply circuit is high, it will not be possible to take advantage of IC performance due to input voltage fluctuation. Therefore connect the input capacitor near V+ pin – the GND pin. When an IC and an input capacitor are far, insert bypass capacitor generally 0.1 F, and lower the high frequency impedance. Ver.2017-01-25 - 13 - NJW4132 NJW4132Application Manual Technical Information Description of Block Features (Continued) 2. Additional and Protection Functions / Features Under Voltage Lockout (UVLO) The UVLO circuit operating is released above V+=4.35V(typ.) and IC operation starts. When power supply voltage is low, IC does not operate because the UVLO circuit operates. There is 100mV(typ.) width hysteresis voltage at rise and decay of power supply voltage. Hysteresis prevents the malfunction at the time of UVLO operating and releasing. Soft Start Function (Soft Start) The output voltage of the converter gradually rises to a set value by the soft start function. The soft start time is 10ms (typ.). It is defined with the time of the error amplifier reference voltage becoming from 0V to 0.95V. The soft start circuit operates after the release UVLO and/or recovery from thermal shutdown. 1.0V Vref, IN- pin Voltage OSC Waveform ON SW pin OFF UVLO(4.35V typ.) Release, Standby, Recover from Thermal Shutdow n Soft Start time: Tss=10ms(typ.) to V B=0.95V Steady Operaton Soft Start effective period to V B=1.0V Fig. 1. Startup Timing Chart - 14 - Ver.2017-01-25 NJW4132 ApplicationNJW4132 Manual Technical Information Description of Block Features (Continued) Over Current Protection Circuit (OCP) NJW4132 contains overcurrent protection circuit of hiccup architecture. The overcurrent protection circuit of hiccup architecture is able to decrease heat generation at the overload. The NJW4132 output returns automatically along with release from the over current condition. At when the switching current becomes ILIM or more, the overcurrent protection circuit is stopped the MOSFET output. The switching output holds low level down to next pulse output at OCP operating. When IN- pin voltage becomes 0.75V or less, it oscillation frequency decreases to approximately 17% At the same time starts pulse counting, and stops the switching operation when the overcurrent detection continues approx 7ms (@ A ver.), 5ms (@ B ver.) and 2ms (@C ver.). After NJW4132 switching operation was stopped, it restarts by soft start function after the cool down time of approx 42ms (typ.). IN- pin Voltage 1.0V 0.75V 0V Oscillation Frequency A ver.=300kHz typ. B ver.=700kHz typ. C ver.=2.0MHz typ. OCP Operates Oscillation Frequency A ver.=50kHz typ. B ver.=117kHz typ. C ver.=410kHz typ. ON SW pin OFF Switching Current ILIM 0 Pulse by Pulse Static Status Pulse Count A ver.=about 7ms B ver.=about 5ms C ver.=about 2ms Cool Down time :42ms typ. Detect Overcurrent Soft Start Fig. 2. Timing Chart at Over Current Detection Thermal Shutdown Function (TSD) When Junction temperature of the NJW4132 exceeds the 160°C*, internal thermal shutdown circuit function stops SW function. When junction temperature decreases to 145°C* or less, SW operation returns with soft start operation. The purpose of this function is to prevent malfunctioning of IC at the high junction temperature. Therefore it is not something that urges positive use. You should make sure to operate within the junction temperature range rated (150 C). (* Design value) Standby Function The NJW4132 stops the operating and becomes standby status when the EN/SYNC pin becomes less than 0.5V. The EN/SYNC pin internally pulls down with 100k , therefore the NJW4132 becomes standby mode when the EN/SYNC pin is OPEN. You should connect this pin to V+ when you do not use standby function. Ver.2017-01-25 - 15 - NJW4132 NJW4132Application Manual Technical Information Description of Block Features (Continued) External Clock Synchronization By inputting a square wave to EN/SYNC pin, can be synchronized to an external frequency. You should fulfill the following specification about a square wave. (Table 2.) Table 2. The input square wave to an EN/SYNC pin. A version B version (fOSC =300kHz) (fOSC =700kHz) 290kHz to 690kHz to Input Frequency 500kHz 1,000kHz Duty Cycle 20% to 80% 35% to 65% Voltage 1.6V or more at High level magnitude 0.5V or less at Low level C version (fOSC =2.0MHz) 1.8MHz to 2.4MHz 40% to 60% The trigger of the switching operating at the external synchronized mode is detected to the rising edge of the input signal. At the time of switching operation from standby or asynchronous to synchronous operation, it has set a delay time approx 20 s to 30 s (@ A ver.) , 10 s to 20 s (@ B ver.) and 3 s to 8 s (@ C ver.) in order to prevent malfunctions. (Fig. 3.) High EN/SYNC pin Low ON SW pin OFF Standby Delay Time External Clock Synchronization Fig. 3. Switching Operation by External Synchronized Clock - 16 - Ver.2017-01-25 NJW4132 ApplicationNJW4132 Manual Technical Information Application Information Inductors Because a large current flows to the inductor, you should select the inductor with the large current capacity not to saturate. Optimized inductor value is determined by the input voltage and output voltage. The Optimized inductor value: (It is a reference value.) VIN=5V VOUT=12V : L < = 10 H You should set the inductor as a guide from above mentioned value to half value. Reducing L decreases the size of the inductor. However a peak current increases and adversely affects the efficiency. (Fig. 4.) Moreover, you should be aware that the output current is limited because it becomes easy to operating to the overcurrent limit. The peak current is decided the following formula. IIN IL Ipk VOUT IOUT A VIN VOUT VIN VIN [A] L VOUT fOSC IL [A] 2 IIN Current Peak Current IPK Inductor Ripple Current DIL Peak Current IPK Input Current IIN Inductor Ripple Current DIL 0 tON tOFF Reducing L Value tON tOFF Increasing L value Fig. 4. Inductor Current State Transition (Continuous Conduction Mode) Ver.2017-01-25 - 17 - NJW4132 NJW4132Application Manual Technical Information Application Information (Continued) Catch Diode When the switch element is in OFF cycle, power stored in the inductor flows via the catch diode to the output capacitor. Therefore during each cycle current flows to the diode in response to load current. Because diode's forward saturation voltage and current accumulation cause power loss, a Schottky Barrier Diode (SBD), which has a low forward saturation voltage, is ideal. An SBD also has a short reverse recovery time. If the reverse recovery time is long, through current flows when the switching transistor transitions from OFF cycle to ON cycle. This current may lower efficiency and affect such factors as noise generation. When the switch element is in ON cycle, a reverse voltage flows to SBD. Therefore you should select a SBD that has reverse voltage rating greater than maximum output voltage. The power loss, which stored in output capacitor, will be increase due to increasing reverse current through SBD at high temperature. Therefore, there is cases preferring reverse current characteristics to forward current characteristic in order to improve efficiency. Input Capacitor Transient current flows into the input section of a switching regulator responsive to frequency. If the power supply impedance provided to the power supply circuit is large, it will not be possible to take advantage of the NJW4132 performance due to input voltage fluctuation. Therefore insert an input capacitor as close to the MOSFET as possible. Output Capacitor An output capacitor stores power from the inductor, and stabilizes voltage provided to the output. Because NJW4132 corresponds to the output capacitor of low ESR, the ceramic capacitor is the optimal for compensation. The Optimized capacitor value: (It is a reference value.) VOUT =12V : COUT > = 22 F In addition, you should consider varied characteristics of capacitor (a frequency characteristic, a temperature characteristic, a DC bias characteristic and so on) and unevenness peculiar to a capacitor supplier enough. Therefore when selecting a capacitors, you should confirm the characteristics with supplier datasheets. When selecting an output capacitor, you must consider Equivalent Series Resistance (ESR) characteristics, ripple current, and breakdown voltage. The output ripple noise can be expressed by the following formula. Vripple(p ESR p) IL [ V ] The effective ripple current that flows in a capacitor (Irms) is obtained by the following equation. Irms - 18 - IPK 2 2 IOUT [ Arms ] Ver.2017-01-25 NJW4132 ApplicationNJW4132 Manual Technical Information Application Information (Continued) Setting Output Voltage, Compensation Capacitor The output voltage VOUT is determined by the relative resistances of R1, R2. The current that flows in R1, R2 must be a value that can ignore the bias current that flows in ER AMP. R2 R1 VOUT 1 VB [ V ] The zero points are formed with R2 and CFB, and it makes for the phase compensation of NJW4132. The zero point is shown the following formula. f Z1 2 1 [Hz] R2 C FB You should set the zero point as a guide from 20kHz to 60kHz. Please optimize CFB by application. Ver.2017-01-25 - 19 - NJW4132 NJW4132Application Manual Technical Information Application Information (Continued) Board Layout In the switching regulator application, because the current flow corresponds to the oscillation frequency, the substrate (PCB) layout becomes an important. You should attempt the transition voltage decrease by making a current loop area minimize as much as possible. Therefore, you should make a current flowing line thick and short as much as possible. Fig.5. shows a current loop at Boost converter. L V IN SBD CIN NJW4132 Built-in SW L COUT V IN SBD CIN (a) Boost Converter SW ON COUT NJW4132 Built-in SW (b) Boost Converter SW OFF Fig. 5. Current Loop at Boost Converter Concerning the GND line, it is preferred to separate the power system and the signal system, and use single ground point. The voltage sensing feedback line should be as far away as possible from the inductance. Because this line has high impedance, it is laid out to avoid the influence noise caused by flux leaked from the inductance. Fig. 6. shows example of wiring at boost converter. Fig. 7. shows the PCB layout example. L SBD V OUT SW V IN CIN COUT V+ RL GND The capacitor is connected near an IC. NJW4132 RFB CFB INR2 R1 Because IN- pin is high impedance, the voltage detection resistance: R1/R2 is put as much as possible near IC(IN-). To avoid the influence of the voltage drop, the output voltage should be detected near the load. Separate Digital(Signal) GND from Pow er GND Fig. 6. Board Layout at Boost Converter - 20 - Ver.2017-01-25 NJW4132 ApplicationNJW4132 Manual Technical Information Application Information (Continued) VOUT VIN SBD L 1pin C OUT C IN Signal GND Area Feed back signal R1 RFB C FB R2 GND OUT EN/SYNC GND IN Power GND Area Connect Signal GND line and Power GND line on backside pattern Fig. 7. Layout Example (upper view) Ver.2017-01-25 - 21 - NJW4132 NJW4132Application Manual Technical Information Calculation of Package Power A lot of the power consumption of boost converter occurs from the internal switching element (Power MOSFET). Power consumption of NJW4132 is roughly estimated as follows. Input Power: Output Power: Diode Loss: NJW4132 Power Consumption: Where: VIN VOUT VF OFF duty PIN = VIN IIN [W] POUT = VOUT IOUT [W] PDIODE = VF IL(avg) OFF duty [W] PLOSS = PIN POUT PDIODE [W] : Input Voltage for Converter : Output Voltage of Converter : Diode's Forward Saturation Voltage : Switch OFF Duty Cycle IIN IOUT IL(avg) : Input Current for Converter : Output Current of Converter : Inductor Average Current Efficiency ( ) is calculated as follows. = (POUT PIN) 100 [%] You should consider temperature derating to the calculated power consumption: PD. You should design power consumption in rated range referring to the power dissipation vs. ambient temperature characteristics (Fig. 8). NJW4132U2 (SOT-89-5-2 Package) Power Dissipation vs. Ambient Temperature (Tj=~150°C) Power Dissipation PD (mW) 3000 At on 4 layer PC Board (*4) At on 2 layer PC Board (*3) 2500 2000 1500 1000 500 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C) (*3): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JEDEC standard, 2Layers) (*4): Mounted on glass epoxy board. (76.2×114.3×1.6mm:based on EIA/JEDEC standard, 4Layers) (For 4Layers: Applying 74.2×74.2mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5) Fig. 8. Power Dissipation vs. Ambient Temperature Characteristics - 22 - Ver.2017-01-25 NJW4132 ApplicationNJW4132 Manual Technical Information Application Design Examples Boost Converter Application Circuit IC : NJW4132U2-B Input Voltage : VIN=5V Output Voltage : VOUT=12V Output Current : IOUT=400mA Oscillation frequency : fosc=700kHz V IN=5V L 10 H/3.4A CIN 10 F/50V SBD COUT 22 F/16V CFB 15pF V+ SW GND R2 220k R1 20k NJW4132 EN/ SYNC RFB 0 V OUT =12V IN- EN/SYNC High: ON Low: OFF (Standby) Reference IC L SBD CIN COUT CFB RFB R1 R2 Ver.2017-01-25 Qty. 1 1 1 1 1 1 1 1 1 Part Number NJW4132U2-B CDRH8D28HPNP-100N CMS16 10 F 22 F 15pF 0 (Short) 20k 220k Description Internal 45V MOSFET SW.REG. IC Inductor 10 H, 3.4A Schottky Diode 40V, 3A Ceramic Capacitor 3225 10 F, 50V, X5R Ceramic Capacitor 3225 22 F, 16V, B Ceramic Capacitor 1608 15pF, 50V, CH Optional Resistor 1608 20k , 1%, 0.1W Resistor 1608 220k , 1%, 0.1W Manufacturer New JRC Sumida Toshiba Murata Murata Std. Std. Std. - 23 - NJW4132 NJW4132Application Manual Technical Information Application Characteristics Efficiency vs. Output Current (VIN=5V, VOUT=12V) 100 13.0 f=700kHz L=10 H 90 f=700kHz L=10 H 12.8 Output Voltage VOUT (V) 80 Efficiency (%) Output Voltage vs. Output Current (VIN=5V) 70 60 50 40 30 20 10 12.6 12.4 12.2 12.0 11.8 11.6 11.4 11.2 0 11.0 1 10 100 Output Current IOUT (mA) 1000 1 10 100 Output Current IOUT (mA) 1000 [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. - 24 - Ver.2017-01-25