Datenblatt-Suchmaschine für elektronische Bauteile |
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MC33340 Datenblatt(PDF) 5 Page - ON Semiconductor |
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MC33340 Datenblatt(HTML) 5 Page - ON Semiconductor |
5 / 16 page MC33340, MC33342 http://onsemi.com 5 INTRODUCTION Nickel Cadmium and Nickel Metal Hydride batteries require precise charge termination control to maximize cell capacity and operating time while preventing overcharging. Overcharging can result in a reduction of battery life as well as physical harm to the end user. Since most portable applications require the batteries to be charged rapidly, a primary and usually a secondary or redundant charge sensing technique is employed into the charging system. It is also desirable to disable rapid charging if the battery voltage or temperature is either too high or too low. In order to address these issues, an economical and flexible fast charge controller was developed. The MC33340/342 contains many of the building blocks and protection features that are employed in modern high performance battery charger controllers that are specifically designed for Nickel Cadmium and Nickel Metal Hydride batteries. The device is designed to interface with either primary or secondary side regulators for easy implementation of a complete charging system. A representative block diagram in a typical charging application is shown in Figure 8. The battery voltage is monitored by the Vsen input that internally connects to a voltage to frequency converter and counter for detection of a negative slope in battery voltage. A timer with three programming inputs is available to provide backup charge termination. Alternatively, these inputs can be used to monitor the battery pack temperature and to set the over and undertemperature limits also for backup charge termination. Two active low open collector outputs are provided to interface this controller with the external charging circuit. The first output furnishes a gating pulse that momentarily interrupts the charge current. This allows an accurate method of sampling the battery voltage by eliminating voltage drops that are associated with high charge currents and wiring resistances. Also, any noise voltages generated by the charging circuitry are eliminated. The second output is designed to switch the charging source between fast and trickle modes based upon the results of voltage, time, or temperature. These outputs normally connect directly to a linear or switching regulator control circuit in non−isolated primary or secondary side applications. Both outputs can be used to drive optoisolators in primary side applications that require galvanic isolation. Figure 9 shows the typical charge characteristics for NiCd and NiMh batteries. Figure 8. Typical Battery Charging Application VCC Undervoltage Lockout Over Temp Latch Battery Detect Temp Detect Time/ Temp Select Vsen Vsen Gate Fast/ Trickle Voltage to Frequency Converter − DV Detect Counter Timer Battery Pack Internal Bias VCC VCC Gnd Q R S t1/Tref High t2/Tsen t3/Tref Low 7 6 5 8 4 3 2 1 High Low Vsen Gate F/T Over Under t1 t2 t3 t/T Ck F/V R Regulator Reg Control DC Input Charge Status R2 R1 MC33340 or MC33342 2.0 V 1.0 V RNTC R3 R4 SW2 SW1 SW3 2.9 V 30 mA 30 mA 30 mA 0.7 V R2 + R1 VBatt Vsen – 1 T |
Ähnliche Teilenummer - MC33340_05 |
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Ähnliche Beschreibung - MC33340_05 |
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