CBM2576HVS-ADJ

CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION FEATURES             APPLICATIONS 3.3 V, 5.0 V, 12 V, and Adjustable Output Versions Adjustable version output voltage range, 1.23V to 57V 土 4% max over line and load conditions Output load current: 3A Input voltage range up to 60V Requires only 4 external components 52 kHz fixed frequency internal oscillator TTL shutdown capability, low power standby mode High efficiency Thermal shutdown and current limit protection Built-in switching transistor on chip 5-lead T0-220 package       Simple High-Efficiency Step-Down (Buck) Regulator Efficient Pre-Regulator for Linear Regulators On-Ca「d Switching Regulators Positive to Negative Converter (Buck-Boost) Negative Step-Up Converters Power Supply for Battery Chargers GENERAL DESCRIPTION The CBM2576HVSseries of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V, and adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed­frequency oscillator. The CBM2576HVSseries offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required. A standard series of inductors optimized for use with the CBM2576HVSare available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed 士 4% tolerance on output voltage within specified input voltages and output load conditions, and 士 10% on the oscillator frequency. The external shutdown function can be controlled by logic level and then come into standby mode. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. The CBM2576HVSseries a「e available in a standard 5-lead T0-220 package. 1 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION Block diagram Figure 1. 3.3V R2 = 2.02k 5.0V, R2 = 3.69k 12V, R2 = 10.56k For adjustable version R1 = Open, R2 = on Typical Electrical Parameters Parameter, unit Efficiency,% Typ. value Test condition CBM2576HVS-ADJ 77 VIN = 12V, ILOAD = 3A, VOUT = 5V CBM2576HVS-3.3 75 CBM2576HVS-5.0 77 CBM2576HVS-12 88 VIN = 15V, ILOAD = 3A 98 VFB = 0V Max. Duty Cycle {ON), % Symbol DCmax VIN = 12V, ILOAD = 3A 2 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION Typical Application (Fixed Output voltage versions) Figure 2. C1—aluminum electrolytic capacitor(100uF, 75V); C2—aluminum electrolytic capacitor(1000uF, 25V); L1—inductor (100uH); D1—Schottky diode Adjustable Output Voltage Versions Figure 3. 弈኿ = th = 弈኿ th Where Vref = 1.23 V, R1 between 1.0 k and 5.0 k C1 = 10 nF C2 = 1 nF 3 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.) Rating Maximum Supply Voltaqe Symbol Vin Value Unit 63 V ON/OFF Pin Input Voltage -0.3V ≤ V ≤ +25 V Output Voltaoe to Ground (Steadv-State) -0.1 V Power Dissipation TO-220,5-Lead PD Internally Limited W Thermal Resistance, Junction-to-Ambient RθJA 65 ℃/W Thermal Resistance, Junction-to-Case RθJC 5.0 ℃/W T0-263, 5-Lead (D2PAK) PD Internally Limited W Thermal Resistance, Junction-to-Ambient RθJA 70 ℃/W Thermal Resistance, Junction-to-Case RθJC 5.0 ℃/W Storage Temperature Range Tstg ℃ Minimum ESD Rating (Human Body Model: 2.0 kV 260 ℃ 150 ℃ C=100pF,R=1.5kΩ) Lead Temperature (Soldering, 10 seconds) Maximum Junction Temperature TJ * Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.) Rating Symbol Value Unit Operating Junction Temperature Range TJ -40 to +125 ℃ Supply Voltage VIN 60 V 4 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vin = 12V for the 3.3V, 5.0V, and Adjustable version, Vin = 25V for the 12V version, and Vin = 30V for the 15V version. ILoad = 500mA, TJ = 25℃, for min/max values TJ is the operating junction temperature range that applies unless otherwise noted) IC CBM2576 HVS-ADJ Parameter, unit Symbol Feedback bias current, nA IB Oscillator frequency, kHz fOSC Saturation voltage, V VSAT Current limit, A ICL min 47 42 - Limit max 100 500 58 63 1.8 2,0 4.2 3.5 6.9 7.5 IL(O) 2 IL(-1) 30 Quiescent current, mA IQ 10 Standby quiescent current, uA ISTBY 200 ON/OFF pin low level input voltage (switch on), V ON/OFF pin high level input voltage (switch off), V ON/OFF pin high level input current (switch off}, uA VIL IIH 2.2 2.4 30 ON/OFF pin low level input current (switch on), uA IIL 10 Feedback voltage, V VFB Output leakage current, mA 1.0 0.8 VIH 1.217 1.243 1.193 1.180 1.273 1.286 Test condition VFB = 1,3V; VIN= 12V VIN= 12V TA,℃ 25±10 125* -40 VFB = OV; VIN= 12V; IOUT = 3A no external circuit VFB = OV; VIN= 12V; 3A ≤ IOUT ≤ 8A no external circuit VFB = 12V; VIN= 60V; VOUT = OV no external circuit VFB = 12V; VIN= 60V; VOUT =-1V no external circuit VFB = 12V; VIN= 12V VFB = OV; VIN= 60V; VON/OFF =5V FB = 0V; N = 12V VFB = 0V; VIN= 12V; VON/OFF = 5V VFB = 0V; VIN= 12V; VON/OFF= 0V VIN=12V;ILOAD=0.5A; VOUT = 5V 8V ≤ VIN ≤ 60V; 0.5A ≤ ILOAD ≤ 3A; VOUT = 5V 25±10 25士10 125* -40 25±10 25±10 125* -40 5 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION Limit IC CBM2576 HVS-3.3 Parameter, unit Symbol Test condition min 47 42 max 58 63 1.8 2.0 Oscillator frequency, kHz fOSC Saturation voltage, V VSAT Current limit, A ICL Output leakage current, mA IL(0) 2 IL(-1) 30 Quiescent current, mA IQ 10 Standby quiescent current, uA lSTBY 200 ON/OFF pin low level input voltage (switch on), V ON/OFF pin high level input voltage (switch off), V ON/OFF pin high level input current (switch off), uA VIL ON/OFF pin low level input current (switch on), uA IIL - 10 Output voltage, V VOUT 3.234 3.366 3.168 3.135 3.450 3.682 4.2 3.5 6.9 7.5 1.0 0.8 VIH 2.2 2.4 30 IIH VIN = 12V VFB = 0V; VIN = 12V; IOUT = 3A no external circuit VFB = 0V; VIN = 12V; 3A ≤ IOUT ≤ 8A; no external circuit VFB = 12V; VIN = 60V; 3A ≤ IOUT ≤ 8A no external circuit VFB = 12V; VIN = 60V; VOUT = -1V; no external circuit VFB = 12V; VIN = 12V VFB = 0V; VIN = 60V; VON/OFF = 5V VFB = 0V; VIN = 12V VFB = 0V; VIN = 12V; VON/OFF = 5V VFB = 0V; VIN = 12V; VON/OFF = 0V VIN = 12V; VLOAD=0.5A 6V ≤ VIN ≤ 60V; 0.5A ≤ ILOAD ≤ 3A TA,℃ 25±10 125* -40 25±10 25±10 125* -40 25±10 25±10 125* -40 6 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION IC CBM2576 HVS-5.0 Parameter, unit Symbol Limit min max 47 58 42 63 1.8 2.0 Oscillator frequency, kHz fSOC Saturation voltage, V VSAT Current limit, A ICL Output leakage current, mA IL(0) 2 IL(-1) 30 Quiescent current, mA IQ 10 Standby quiescent current, uA ISTBY 200 ON/OFF pin low level input voltage (switch on), V ON/OFF pin high level input voltage (switch off), V ON/OFF pin high level input current (switch off), uA VIL IIH 2.2 2.4 30 ON/OFF pin low level input current (switch on), uA IIL 10 Output voltage, V VOUT 4.2 3.5 6.9 7.5 1.0 0.8 VIH 4.90 5.10 4.800 4.750 5.225 5.275 Test condition VIN = 12V VFB = 0V; VIN = 12V; IOUT = 3A no external circuit VFB = 0V; VIN = 12V; 3A ≤ IOUT ≤ 8A no external circuit VFB = 12V; VIN = 60V; VOUT = 0A no external circuit VFB = 12V; VIN = 60V; VOUT = -1A no external circuit VFB = 12V; VIN = 12V VFB = 0V; VIN = 60V; VON/OFF = 5V VFB = 0V; VIN = 12V VFB = 0V; VIN = 12V; VON/OFF = 5V VFB = 0V; VIN = 12V; VON/OFF = 0V VIN = 12V; ILOAD = 0.5A 8V ≤ VIN ≤ 60V; 0.5A ≤ ILOAD ≤ 3A TA,℃ 25±10 125* -40 25±10 25±10 125* -40 25±10 25±10 125* -40 7 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION IC CBM2576 HVS-12 Parameter, unit Symbol Limit min max 47 58 42 63 1.8 2.0 Oscillator frequency, kHz FOSC Saturation voltage, V VSAT Current limit, A ICL Output leakage current, mA IL(0) 2 IL(-1) 30 Quiescent current, mA IQ 10 Standby quiescent current, uA ON/OFF pin low level input voltage (switch on), V ON/OFF pin high level input voltage (switch off), V ON/OFF pin high level input current (switch off), uA ISTBY 200 IIH 2.2 2.4 30 ON/OFF pin low level input current (switch on), uA IIL 10 Output voltage, V VOUT VIL 4.2 3.5 6.9 7.5 1.0 0.8 VIH 11.76 12.24 11.52 11.40 12.54 12.66 Test condition VIN = 25V VFB = 0V; VIN = 25V; IOUT = 3A no external circuit VFB = 0V; VIN = 25V; 3A ≤ IOUT ≤ 8A no external circuit VFB = 25V; VIN = 60V; VOUT = 0V no external circuit VFB = 25V; VIN = 60V; VOUT = -1V no external circuit VFB = 25V; VIN = 25V VFB = 0V; VIN = 60V; VON/OFF = 5V VFB = 0V; VIN = 25V VFB = 0V; VIN = 25V; VON/OFF = 5V VFB = 0V; VIN = 25V; VON/OFF = 0V VIN = 25V; ILOAD = 0.5A 15V ≤ VIN ≤ 60V; 0.5A ≤ ILOAD ≤ 3A TA,℃ 25±10 125* -40 25±10 25±10 125* -40 25±10 25±10 125* -40 * Junction temperature. Junction temperature is equal to ambient because of measurements of electric parameters are executed in pulse mode. 8 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION Application Information INVERTING REGULATOR Figure 4 shows a CBM2576-12 in a buck-boost configuration to generate a negative 12V output from a positive input voltage. This circuit bootstraps the regulator's ground pin to the negative output voltage, then by grounding the feedback pin, the regulator senses the inverted output voltage and regulates it to -12V. For an input voltage of 12V or more, the maximum available output current in this configuration is approximately 700 mA. At lighter loads, the minimum input voltage required drops to approximately 4.7V. The switch currents in this buck-boost configuration are higher than in the standard buck-mode design, thus lowering the available output current. Also, the start-up input current of the buck-boost converter is higher than the standard buck-mode regulator, and this may overload an input power source with a current limit less than 5A. Using a delayed turn-on or an undervoltage lockout circuit (described in the next section) would allow the input voltage to rise to a high enough level before the switcher would be allowed to turn on. Because of the structural differences between the buck and the buck-boost regulator topologies, the buck regulator design procedure section can not be used to to select the inductor or the output capacitor. The recommended range of inductor values for the buck-boost design is between 68µH and 220µH, and the output capacitor values must be larger than what is normally required for buck designs. Low input voltages or high output currents require a large value output capacitor (in the thousands of micro Farads). The peak inductor current, which is the same as the peak switch current, can be calculated from the following formula: Ip ≈ ILOAD VIN VIN VO VIN |VO | × VIN |VO | L FOSC Where fOSC = 52 kHz. Under normal continuous inductor current operating conditions, the minimum VIN represents the worst case. Select an inductor that is rated for the peak current anticipated. 9 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION FIGURE 4. Inverting Buck-Boost Develops -12V Also, the maximum voltage appearing across the regulator is the absolute sum of the input and output voltage. For a -12V output, the maximum input voltage for the IL2576 is +28V. NEGATIVE BOOST REGULATOR Another variation on the buck-boost topology is the negative boost configuration. The circuit in Figure 5 accepts an input voltage ranging from -SV to -12V and provides a regulated -12V output. Input voltages greater than-12V will cause the output to rise above -12V, but will not damage the regulator Typical Load Current 400 mA for VIN= -5.2V 750 mA for VIN = -7V Note: Heat sink may be required FIGURE 5. Negative Boost 10 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION Because of the boosting function of this type of regulator, the switch current is relatively high, especially at low input voltages. Output load current limitations are a result of the maximum current rating of the switch. Also, boost regulators can not provide current limiting load protection in the event of a shorted load, so some other means (such as a fuse) may be necessary. UNDERVOLTAGE LOCKOUT In some applications it is desirable to keep the regulator off until the input voltage reaches a certain threshold. An undervoltage lockout circuit which accomplishes this task is shown in Figure 6 while Figure 7 shows the same circuit applied to a buck-boost configuration. These circuits keep the regulator off until the input voltage reaches a predetermined level. VTH =VZ1 + 2VBE(Q1) FIGURE 6. Undervoltage Lockout for Buck Circuit FIGURE 7. Undervoltage Lockout for Buck-Boost Circuit 11 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION DELAYED STARTUP The ON /OFF pin can be used to provide a delayed startup feature as shown in Figure 8. With an input voltage of 20V and for the part values shown, the circuit provides approximately 10 ms of delay time before the circuit begins switching Increasing the RC time constant can provide longer delay times. But excessively large RC time constants can cause problems with input voltages that are high in 60Hz or 120Hz ripple, by coupling the ripple into the ON /OFF pin. FIGURE 8. Delayed Startup ADJUSTABLE OUTPUT, LOW-RIPPLE POWER SUPPLY A 3A power supply that features an adjustable output voltage is shown in Figure 9. An additional L-C filter that reduces the output ripple by a factor of 10 or more is included in this circuit. FIGURE 9. Adjustable 3A Power Supply with Low Output Ripple 12 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION Definition of Terms BUCK REGULATOR A switching regulator topology in which a higher voltage is converted to a lower voltage. Also known as a step-down switching regulator. BUCK-BOOST REGULATOR A switching regulator topology in which a positive voltage is converted to a negative voltage without a transformer. DUTY CYCLE (D) Ratio of the output switch's on-time to the oscillator period. for buck regulator D= tON = for buck-boost regulator D= tON = T T VOUT VIN |VO | |VO | VIN CATCH DIODE OR CURRENT STEERING DIODE The diode which provides a return path for the load current when the IL2576 switch is OFF. EFFICIENCY (η) The proportion of input power actually delivered to the load. η= POUT POUT ≈ PIN POUT PLOSS 13 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION PACKAGE INFORMATION TO-220-5L SYMBOL DIMENSIONS IN MILLIMETERS DIMENSIONS IN INCHES MIN NOM MAX MIN NOM MAX A 4.07 4.45 4.82 0.160 0.175 0.190 b 0.76 0.89 1.02 0.030 0.035 0.040 C 0.36 0.50 0.64 0.014 0.020 0.025 D 14.22 14.86 15.50 0.560 0.585 0.610 E 9.78 10.16 10.54 0..385 0.400 0.415 e 1.57 1.71 1.85 0.062 0.067 0.073 e1 6.68 6.81 6.93 0.263 0.268 0.273 F 1.14 1.27 1.40 0.045 0.050 0.055 H1 5.46 6.16 6.86 0.215 0.243 0.270 J1 2.29 2.74 3.18 0.090 0.108 0.125 L 13.21 13.97 14.73 0.520 0.550 0.580 øp 3.68 3.81 3.94 0.145 0..150 0.155 Q 2.54 2.73 2.92 0.100 0.107 0.115 14 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION TO-263-5L SYMBOL DIMENSIONS IN MILLIMETERS DIMENSIONS IN INCHES MIN NOM MAX MIN NOM MAX A 4.07 4.46 4.85 0.160 0.176 0.191 B 0.66 0.84 1.02 0.026 0.033 0.040 C 0.36 0.50 0.64 0.014 0.020 0.025 C2 1.14 1.27 1.40 0.045 0.050 0.055 D 8.65 9.15 9.65 0.341 0.360 0.380 E 9.78 10.16 10.54 0.385 0.400 0.415 e 1.57 1.71 1.85 0.062 0.068 0.073 F 6.60 6.86 7.11 0.260 0.270 0.280 L 14.61 15.24 15.88 0.575 0.600 0.625 L1 2.29 2.54 2.79 0.090 0.100 0.110 L2 2.92 0.115 15 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION TO-220-5L(Bent Staggered) SYMBOL DIMENSIONS IN MILLIMETERS DIMENSIONS IN INCHES MIN NOM MAX MIN NOM MAX A 4.4 4.6 4.7 0.175 0.180 0.185 b 0.7 0.8 0.9 0.027 0.032 0.037 D 8.4 8.7 8.9 0.330 0.340 0.350 d1 1.0 0.039 d2 6.3 0.248 E 9.91 10.16 10.41 0.390 0.400 0.410 e 1.6 1.7 1.8 0.062 0.067 0.072 F 1.2 1.25 1.3 0.048 0.050 0.052 H1 6.4 0.250 H2 20.8 21.6 22.4 0.820 0.850 0.880 H3 23.9 24.7 25.5 0.942 0.972 1.002 J1 J2 2.7 3.7 J3 Q 4..5 0.105 5.3 0.147 8.4 2.5 2.8 0.177 0.207 0.331 3.0 0.100 0.110 0.120 16 www.corebai.com CBM2576HVS-3.3/5.0/12/ADJ OPERATION INSTRUCTION PACKAGE/ORDERING INFORMATION PRODUCT ORDERING TEMPRANG NUMBER E PACKAGE PAKEAGE TRANSPOT MARKING MEDIA,QUANTILY CBM2576HVT-ADJ -40℃~125℃ TO-220 2576HVT-ADJ Tape and Reel,46 CBM2576HVS-ADJ -40℃~125℃ TO-263-5 2576HVS-ADJ Tape and Reel,500 CBM72576HVT-3.3 -40℃~125℃ TO-220 2576HVT-3.3 Tape and Reel,46 CBM2576HVS-3.3 -40℃~125℃ TO-263-5 2576HVS-3.3 Tape and Reel,500 CBM2576HVT-5.0 -40℃~125℃ TO-220 2576HVT-5.0 Tape and Reel,46 CBM2576HVS-5.0 -40℃~125℃ TO-263-5 2576HVS-5.0 Tape and Reel,500 CBM2576HVT-12 -40℃~125℃ TO-220 2576HVT-12 Tape and Reel,46 CBM2576HVS-12 -40℃~125℃ TO-263-5 2576HVS-12 Tape and Reel,500 CBM2576 CBM2576-3.3 CBM2576-5 CBM2576-12 17 www.corebai.com