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HV57009 数据表(PDF) 6 Page - Supertex, Inc |
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HV57009 数据表(HTML) 6 Page - Supertex, Inc |
6 / 8 page 6 HV57009 Typical Current Programing Circuits +IN -IN RD*10KΩ CD*390pF HV57009 Logic To other outputs - + 0.1µF VREF IOUT HVOUT VDD 0.1µF VBP IREF REXT +IN -IN RD*10KΩ CD*390pF HV57009 Logic To other outputs -+ VSS Figure 1b: Positive Control Figure 1a: Negative Control VREF IOUT HVOUT VDD VBP IREF REXT VSS *Required if R EXT > 10KΩ or REXT is replaced by a constant current source. Since I OUT = IREF = Therefore: If I OUT = 2.0mA and VREF = -5.0V → REXT = 2.5KΩ. If I OUT = 1.0mA and REXT = 1.0KΩ → VREF = -1.0V. If R EXT >10KΩ, add series network RD and CD to ground for stability as shown. This control method behaves linearly as long as the opera- tional amplifier is not saturated. However, it requires a nega- tive power source and needs to provide a current I REF = IOUT for each HV570 chip being controlled. If HV OUT ≥ +1.0V, the HVOUT cascode may no longer oper- ate as a perfect current source, and the output current will diminish. This effect depends on the magnitude of the output current. Given I OUT and VREF, the REXT can be calculated by using: R EXT = = The intersection of a set of I OUT and VREF values can be lo- cated in the graph shown below. The value picked for R EXT must always be in the shaded area for linear operation. This control method has the advantage that V REF is positive, and draws only leakage current. If R EXT > 10KΩ, add series net- work R D and CD to ground for stability as shown. Note: Lower reference current I REF, results in higher distortion, ∆I CS, on the output. V REF R EXT HV570 I OUT vs. V REF 0 1 2 3 4 012 345 VREF (Volts) 0.5K 0.1K 0.2K 1K 2K 3K 5K V REF I REF V REF I OUT |
类似零件编号 - HV57009_07 |
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类似说明 - HV57009_07 |
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