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BH76109HFV Datasheet(PDF) 4 Page - Rohm |
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BH76109HFV Datasheet(HTML) 4 Page - Rohm |
4 / 9 page Technical Note 4/8 BH76106HFV, BH76109HFV, BH76112HFV, BH76206HFV www.rohm.com 2009.03 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. (9) Standby pin When the standby pin is open, the LSI is in a standby state. Since adding a voltage greater than Vcc at the standby pin turns a protective diode ON, make this at most Vcc+0.2 V (no greater than Vcc+VF). (See Fig. 4) Applying a voltage to the standby pin when the voltage Vcc is not being applied also turns the protective diode ON, so do not apply a voltage. Responsiveness of Standby Control STBY STBY VIN VIN (100% color bar signal) (100% color bar signal) VOUT VOUT Fig.5 Standby Response Characteristic Fig.6 Standby Response Characteristic ※ In relation to IC startup, this is practically 0 μs. ※ In relation to IC shutdown, this is after approximately 2 μs. Noise also does not occur when toggling the switch. (10) Input coupling capacitor Making the input coupling capacitor a value less than 0.1 μF (the recommended value) increases SAG. Determine the capacitance of the input capacitor used after taking into consideration the relationship of SAG to input coupling capacitor. Fig.7 Moreover, if you make the input coupling capacitor a value greater than 0.1 μF (the recommended value), it may take time for the output waveform to stabilize. Decide the value of the coupling capacitor used by referring to the results shown in Fig. 10. Approx. 0.7V Vcc+VF Diode ON Vcc Fig.4 0 10 20 30 40 50 60 0.00 0.01 0.10 1.00 INPUT COUPLING CAPACITOR (μF) Relationship of SAG to Input Coupling Capacitor ↑ ↓△V Δ V : SAG Vin VOUT 0.1μF Monitor Vary the value of an external capacitor and check the bounds of the output waveform 100μF 22μF 75Ω VSAG 75Ω Cin 1V ① Vin VOUT Monitor 100μF 22μF 75Ω VSAG 75Ω ③ ② Cin STBY Fig.8 Fig.9 (Startup characteristic, Vcc = 3.0 V) (Shut down characteristic, Vcc = 3.0 V) |
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