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| BA44W12SAT Regulator ICs Dual output voltage regulator with power saving BA44W12SAT The BA44W12SAT is a general-purpose power supply with outputs : 8V, 1A and 8V, 500mA. The IC is available in a compact TO220FP-5 package. The outputs can be turned off during the power saving state with a built-in switch. Also built in the IC are an overcurrent protection circuit, an overvoltage protection circuit, and a thermal shutdown circuit. !Applications Car audio systems, VCRs, facsimiles, air conditions, and other household and industrial equipment !Features 1) Minimum I / O voltage differential is 0.5V or less. 2) Built-in protection circuits against overcurrent, over voltage, and overheat. 3) Available in a compact TO220FP-5 package (pins are bendable) 4) Zero power saving current. (Typ.) !Absolute maximum ratings (Ta=25C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Peak applied voltage Symbol VCC Pd Topr Tstg VCCPeak Limits 35 20001 -40~+85 -55~+150 502 Unit V mW C C V 1 Reduced by 16mW for each increase in Ta of 1C over 25C. 2 Applied time is less than 200ms (tr1ms). tr1ms 50V 35V Max.200ms 0V !Recommended operating conditions (Ta=25C) Parameter Power supply voltage Symbol VCC Min. 9.0 Typ. 13 Max. 25 Unit V BA44W12SAT Regulator ICs !Block diagram VCC 2 REFERENCE VOLTAGE 1 8V OUT1 + CTL 5 GND 3 8V 4 + OUT2 !Pin descriptions Pin No. 1 2 3 4 5 Pin name OUT1 VCC GND OUT2 CTL Output 1 (8V, 1A) Power supply Ground Output 2 (8V, 500mA) ON / OFF switch Function BA44W12SAT Regulator ICs !Input / output circuits OUT1, 2 VCC (2pin) CTL (5pin) 25k 1, 4pin 10.8k (1pin) 10.8k (4pin) 25k 2k GND (3pin) GND (3pin) !Electrical characteristics (unless otherwise noted, Ta=25C, VCC=13.0V) Parameter Power save supply current Bias current <8V output section> (Output 1) Output voltage 1 Minimum I / O voltage differential 1 Output current capacity 1 Ripple rejection ratio 1 Input stabillty 1 Load regulation 1 Output short-circuit current 1 <8V output section> (Output 2) Output voltage 2 Minimum I / O voltage differential 2 Output current capacity 2 Ripple rejection ratio 2 Input stabillty 2 Load regulation 2 Output short-circuit current 2 Note) All the characteristic values are measured with a 0.33F-capacitor connected the input pin and 22F-capacitor connected to the output pin. Measurements are made by using a plus (tw10ms, duty cycle5%) in all cases but noise voltage and the ripple rejection ratio. BA44W12SAT Regulator ICs !Measurement circuits OUT1 VCC OUT2 CTL 0.33 VCC 5V + GND + 22 V 22 V IO2 IO1 VCC=13V, VCC=13V, VCC=925V, VCC=925V, VCC=13V, VCC=13V, VCC=13V VCC=13V IO=500mA IO=350mA IO=500mA IO=350mA IO=5mA1A IO=5mA500mA when measuring output voltage 1 when measuring output voltage 2 when measuring input stability 1 when measuring input stability 2 when measuring load reguration 1 when measuring load reguration 2 when measuring output current capacity 1 when measuring output current capacity 2 Fig.1 Circuit for measuring output voltage, input stability, load regulation, and output current capacity VCC 105W VCC OUT1 CTL + GND OUT2 + 22 0.33 100 + eIN=1Vrms f=120Hz 5V 22 500mA 350mA VCC=13V, IO1=500mA when meauring the ripple rejection ratio 1 VCC=13V, IO2=350mA when meauring the ripple rejection ratio 2 Fig.2 Circuit for measuring ripple rejection ratio BA44W12SAT Regulator ICs V V OUT1 VCC CTL 0.33 VCC 5V GND OUT2 + 22 V + 22 V 350mA 500mA VCC=7.6V VCC=7.6V when measuring minimum I / O voltage difference 1 when measuring minimum I / O voltage difference 2 Fig.3 Circuit for measuring minimum I / O voltage difference OUT1 A VCC CTL 0.33 VCC GND OUT2 + 22 + 22 5V VCC=13V, IO=0mA, VCTL=5V VCC=13V, IO=0mA, VCTL=0V when measuring bias current when measuring power save supply current Fig.4 Circuit for measuring bias current and power save supply current OUT1 VCC CTL GND OUT2 0.33 VCC=25V + + 22 22 A 5V A Fig.5 Circuit for measuring output short-circuit current BA44W12SAT Regulator ICs OUT1 VCC OUT2 CTL 0.33 GND + 22 VCC=13V + 22 V V 2.0V 0.8V Fig.6 Circuit for measuring mode switching voltage OUT1 VCC OUT2 CTL GND + VCC=13V 0.33 22 + 22 A 5V Fig.7 Circuit for measuring input high level current !Application circuit OUTPUT1 + 22 Vcc OUTPUT2 CTL GND 0.33 + 22 5V Fig.8 BA44W12SAT Regulator ICs !Operation notes (1) Although the circuit examples included in this hand-book are highly recommendable for general use, you should be thoroughly familiar with circuit characteristics as they relate to your own use conditions. If you intend to change the number of external circuits, leave an ample margin, taking into account discrepancies in both static and dynamic characteristics of external parts and Rohm ICs. In addition, please be advised that Rohm cannot provide complete assurance regarding patent rights. (2) Operating power supply voltage When operating within the proper ranges of power supply voltage and ambient temperature, most circuit functions are guaranteed. Although the rated values of electrical characteristics cannot be absolutely guaranteed, characteristic values do not change drastically within the proper rages. (3) Power dissipation (Pd) Refer to the power dissipation characteristics in Fig.12. If power dissipation exceeds the allowable limit, the fuctionality of the IC will be degraded (such as reduction of current capacity by increased chip temperature). Make sure to use the IC within the allowable range of power dissipation with a sufficient margin. (4) Preventing oscillation at each output and bypass capacitor To stop output oscillation, make sure to connect a capacitor between GND and each output pin (capacitance of at least 10F over the whole operating temperature is recommended). Oscillation can occur if capacitance is susceptible to temperature. We recommended using a tantalum capacitor with minimal changes in capacitance. Also, output can be further stabilized by connecting a bypass capacitor of about 0.33F between VCC and GND. (5) Overcurrent protection circuit An overcurrent protection circuit is installed in each output system, based on the respective output current. This prevents IC destruction due to overcurrent, by limiting the current with a curve shape of "7" in the voltagecurrent graph. The IC is designed with margins so that current flow will be restricted and latching will be prevented even if a large current suddenly flows current suddenly flows through a large capacitor. Note that theses protection circuits are only good for preventing damage from sudden accidents. Make sure your design does not case the protection circuit to operate continuously under transitional conditions (for instance, if output is clamped at 1VF or higher, short mode circuit operates at 1VF or lower). Note that the capacitance is negatively correlated with temperature. (6) Thermal protection circuit A built-in thermal protection circuit prevents thermal damage to the IC. All outputs are turned off when the circuit operates, and revert to the original state when the temperature drops to a certain level. (7) We recommend installing a bypass line in your application if there is a mode where potential difference between each output and input (VCC) or GND is reversed from the normal state. A reversed mode may cause damage to the IC. (8) Although the quality of this IC is rigorously controlled, the IC may be destroyed when the applied voltage or the operating temperature exceeds their absolute maximum ratings. Because short mode or open mode cannot be specified when the IC is destroyed, be sure to take physical safety measures, such as fusing, if any of the absolute maximum ratings might be exceeded. BA44W12SAT Regulator ICs (9) Recommended to put diode for protection in case of output pin connected with large load of impedance or reserve current occurred at initial and output off. (Example) Output (10) When used within a strong magnetic field, be aware that there is a slight possibility of malfunction. (11) We are confident in recommending the above application circuit example, but we ask that you carefully check the characteristics of this circuit before using it. If using circuit after modifying other external circuit constants, be careful to ensure adequate margins for variation between external devices and this IC, including not only static characteristics but also transient characteristics. This IC is a bipolar IC which (as shown in Figure 9) has P+ isolation in the P substrate and between the various pins. A P-N junction is formed form this P layer and the N layer of each pin. For example the relation between each potentials is as follows, (When GND > PinB and GND > PinA, the P-N junction operates as a parasitic diode.) (When PinB > GND > PinA, the P-N junction operates as a parasitic transistor.) Parasitic diodes can occur inevitably in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits as well as operation faults and physical damage. Accordingly, you must not use methods by which parasitic diodes operate, such as applying a voltage that is lower than the GND (P substrate) voltage to an input pin. Resistance (Pin A) (Pin B) C Transistor (NPN) B E GND N + P N P N P + N N P + P N P + N P substrate Parasitic diode GND P substrate Parasitic diode or transistor (Pin B) GND (Pin A) C Parasitic diode B E GND Parasitic diode or transistor Fig.9 Simplified structure of bipolar IC GND BA44W12SAT Regulator ICs !Electrical characteristic curves 12 11 OUTPUT VOLTAGE : VO (V) 9 VCC=13V Ta=25C 8 OUTPUT VOLTAGE : VO (V) 10 9 8 7 6 5 4 3 2 1 0 0 500 1000 1500 2000 OUTPUT CURRENT : IO (mA) VO2 VO1 7 6 5 4 3 2 1 0 0 6 POWER DISSIPATION : Pd (W) Ta=25C IO=0mA VO1 VO2 Over voltage protection circuit, ON VCC=28V(Typ.) 28 24 20 16 12 8 (3) 4 0 (4) 0 25 50 (1) (1) With infinte heat sink (2) With Al heat sink 100x100x2 (mm2) (3) With Al heat sink 50x50x2 (mm2) (4) Without heat sink Note : When using AI heat sink, a tightening torque of 6 (kg cm) and silicon grease is applied (2) 12 18 24 30 36 42 48 54 75 100 125 150 POWER SUPPLY VOLTAGE : VCC (V) AMBIENT TEMPERATURE : Ta (C) Fig.10 Output current capacity characteristics (Typ.) Fig.11 Output voltage characteristics (Typ.) Fig.12 Thermal derating characteristics !External dimentions (Units : mm) 1.8 0.2 1.8 0.2 10.0 7.0 + 0.3 - 0.1 + 0.3 - 0.1 4.5 + 0.3 - 0.1 10.0 - 0.1 7.0 + 0.3 - 0.1 + 0.3 4.5 + 0.3 - 0.1 3.2 0.1 2.8 + 0.2 - 0.1 3.2 0.1 2.8 + 0.2 - 0.1 17.0 - 0.2 + 0.4 - 0.2 + 0.4 12.0 0.2 12.0 0.2 31.5Max. 8.0 0.2 0.7 8.0 0.2 17.0 (2.0) 4.25 8.15 13.5Min. 1.2 0.2 1.2 0.8 12345 1.778 0.5 + 0.1 2.85 12345 1.2 0.8 0.5 0.1 1.778 23.4 (2.85) TO220FP-5 TO220FP-5 (V5) 17.5 25.8 |
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