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STV9325 bảng dữ liệu(PDF) 6 Page - STMicroelectronics |
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STV9325 bảng dữ liệu(HTML) 6 Page - STMicroelectronics |
6 / 14 page Application Hints STV9325 6/14 4.1.1.1 Centering Display will be centered (null mean current in yoke) when voltage on pin 7 is (R1 is negligible): 4.1.1.2 Peak Current Example: for Vm =2 V, VM = 5 V and IP =1A Choose R1 in the1 Ω range, for instance R1=1 Ω From equation of peak current: Then choose R2 or R3. For instance, if R2 = 10 kΩ, then R3 = 15 kΩ Finally, the bias voltage on pin 7 should be: 4.1.2 Ripple Rejection When both ramp signal and bias are provided by the same driver IC, you can gain natural rejection of any ripple caused by a voltage drop in the ground (see Figure 5), if you manage to apply the same fraction of ripple voltage to both booster inputs. For that purpose, arrange an intermediate point in the bias resistor bridge, such that (R8 / R7) = (R3 / R2), and connect the bias filtering capacitor between the intermediate point and the local driver ground. Of course, R7 should be connected to the booster reference point, which is the ground side of R1. Figure 5: Ripple Rejection V 7 V M V m + 2 ------------------------ R 2 R 2 R 3 + ---------------------- ⎝⎠ ⎜⎟ ⎛⎞ × = I P V M V m – () 2 ----------------------------- R 2 R 1 xR 3 ------------------- × = R 2 R 3 ------- 2I P R 1 × × V M V m – ----------------------------- 2 3 --- = = V 7 V M V m + 2 ------------------------ 1 1 R 3 R 2 ------- + ----------------- × 7 2 ---- 1 2.5 -------- × 1.4V = = = R3 R2 R1 Rd Yoke Ly Power Amplifier Flyback Generator Thermal Safety 7 32 5 6 1 4 + - R7 R8 R9 Reference Voltage Ramp Signal Driver Ground Source of Ripple |
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