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| Regulator ICs DC / DC converter BP5020 / BP5021 / BP5022 The BP5020, BP5021, and BP5022 are DC / DC converter units that use a pulse width modulation (PWM) system. They contain control circuits, switching devices, rectifiers, and coils, and operate by only connecting an I / O smoothing capacitor. With a high efficiency of power conversion, the ICs are available in stand-alone 9-pin SIP packages with no heat sink required. They can be applied to various purposes by fine-adjusting the output control and output voltage. With a wide range of input voltage, the ICs are best suited for obtaining a stable local power source from a main power supply with a large voltage variation. FApplications Power supplies for copiers, personal computers, word processors, measuring instruments, vending machines, security devices, registers, industrial equipment, and maintenance tools FFeatures 1) Wide range of input voltage. 2) High power conversion efficiency. 3) Applicable to various purposes by fine-adjusting the output control and output voltage with external circuits. FBlock diagram 4) Small number of external components required. 5) Heat sink unnecessary. 6) Compact SIP 9-pin package. 312 Regulator ICs FList of the BP502-series BP5020 / BP5021 / BP5022 FAbsolute maximum ratings (Ta = 25_C) 313 Regulator ICs FElectrical characteristics BP5020 (unless otherwise noted, VI = 15V, IO = 0.5A, SW = 1, Ta = 25_C) BP5020 / BP5021 / BP5022 BP5021 (unless otherwise noted, VI = 15V, IO = 0.25A, SW = 1, Ta = 25_C) BP5022 (unless otherwise noted, VI = 20V, IO = 0.25A, SW = 1, Ta = 25_C) 314 Regulator ICs FMeasurement circuit BP5020 / BP5021 / BP5022 315 Regulator ICs FCircuit operation The switching transistor in the hybrid IC can be forcedly turned off by putting pin 4 to the open state (high impedance). The output voltage can be fine-adjusted be connecting a capacitor to pin 6, which is connected to the output voltage sensing circuit. BP5020 / BP5021 / BP5022 FApplication example Application 1: DC / DC converter with a protection circuit A resistor to secure the rise of output at power on. The resistance to be selected depends on the input voltage. This is a standard application. Because the control curApplication 2: Output ON / OFF control rent fluctuates with variations in circuits and components, set the control current by adding a sufficient margin to the normal current level. C1 is a slow-start capacitor for mitigating the excessive rush current that flows into the hybrid IC when the switch is turned on. 316 Regulator ICs Application 3: Output voltage fine adjustment i) When reducing the output voltage BP5020 / BP5021 / BP5022 ii) When increasing the output voltage VR value setting equations (the output voltage after adjustment is denoted as VO) i) When reducing the output voltage BP5020 / BP5021 R = (VO * 1.281) / (0.0278 * 0.00556VO) (k) BP5022 R = (VO * 1.281) / (0.1196 * 0.01VO) (k) ii) When increasing the output voltage BP5020 / BP5021 R = 11160 / (48.4VO * 242) (k) BP5022 R = 1200 / (9.368VO * 112) (k) To make full use of the ability of the hybrid IC, we recommend the output voltage be adjustment within 20% of the output voltage rating. When the output voltage is increased by 20%, for instance, the minimum input voltage is also increased by 20 %. Application 4: Slow start The slow start circuit mitigates the pulse load on the internal switching transistor when input voltage is applied, and rises the output voltage gradually by starting the switching operation slowly. (Example: When the output voltage is changed from 5V to 6V in the BP5020, the minimum input voltage is changed from 8V to 9.6V.) This application is useful for preventing the malfunction of an external protection circuit due to a rush current, and can serve as a countermeasure against the operation outside the safe operation range. C1 is a slow-start capacitor for mitigating the excessive rush current that flows into the hybrid IC when the switch is turned on. 317 Regulator ICs FPin noise voltage Results obtained with the measurement circuit of Fig. 10 is shown in Fig. 9. BP5020 / BP5021 / BP5022 318 Regulator ICs FOperation notes (1) The output current should be reduced according to an increase in the input voltage or ambient temperature. Use the IC within the derating curve range. (2) Pins 5 and 7 are not used. (3) No circuit is installed in the IC to protect against excessive output currents. Take physical safety measures such as fusing if short-circuit loading is probable. (4) A large rush current may flow in the IC when the input voltage is applied or the output ON / OFF is controlled with pin 4 without a capacitor such as C1 in application 2. Comply with the safe operation ranges shown in Figs. 13, 16, and 19. FElectrical characteristic curves For the BP5020 BP5020 / BP5021 / BP5022 The safe operation range of the IC is determined by the safe operation range of the internal switching transistor. The amount of rush current depends on the output impedance of the input power supply and capacitors connected to the IC outputs. The pulse load on the internal switching transistor at the start of operation can be reduced by using the protection circuit of application 1 or the slow start circuit of application 4. For the BP5021 319 Regulator ICs For the BP5022 BP5020 / BP5021 / BP5022 FExternal dimensions (Units: mm) 320 |
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