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MC33340DG Datasheet(PDF) 10 Page - ON Semiconductor |
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MC33340DG Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 16 page MC33340, MC33342 http://onsemi.com 10 Figure 11. Timer Functional Block Diagram Oscillator 760 kHz ÷23 ÷26 ÷23 ÷21 ÷25 ÷28 ÷22 ÷2 ÷2 ÷2 ÷2 Normal Test Switch 2 211 Switch 3A 25 95 kHz SCK to Voltage to Frequency Converter Fast/Trickle Output Time and Test Decoder Each test mode bypass switch is shown in the proper position for normal charger operation. ÷22 t1/TrefHigh t3/TrefLow t2/Tsen Switch 3B 211 Switch 1 219 Q Q 22 ms Convert 11 ms Preset Holdoff Time Signal D MC33340 MC33342 Figure 12. Line Isolated Linear Regulator Charger This application combines the MC33340/342 with an adjustable three terminal regulator to form an isolated secondary side battery charger. Regulator IC2 operates as a constant current source with R7 setting the fast charge level. The trickle charge level is set by R5. The R2/R1 divider should be adjusted so that the Vsen input is less than 2.0 V when the batteries are fully charged. The printed circuit board shown below will accept the several TO−220 style heat- sinks for IC2 and are all manufactured by AAVID Engineering Inc. 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 DC Input D1 Charge Status R2 R1 IC1 MC33340 or MC33342 2.0 V 1.0 V RNTC 10 k R3 R4 SW2 SW1 SW3 2.9 V 30 mA 30 mA 30 mA 0.6 V C2 0.1 D3 R5 1.0 k 1N4002 D2 C1 0.01 R7 2.4 R8 220 IAdj R6 1.8 k AC Line Input R2 + R1 VBatt Vsen – 1 Ichg(fast) + Vref ) (IAdj R8) R7 Ichg(trickle) + Vin – Vf(D3) –VBatt R5 LM317 IC2 D4 |
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