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TEA1553T 数据表(PDF) 7 Page - NXP Semiconductors |
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TEA1553T 数据表(HTML) 7 Page - NXP Semiconductors |
7 / 27 page TEA1553T_1 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 01 — 3 July 2007 7 of 27 NXP Semiconductors TEA1553T GreenChip II SMPS control IC 7.3 Current mode control Current mode control is used for its good line regulation behavior. The on-time, is controlled by the internally inverted control pin voltage, which is compared with the primary current information. The primary current is sensed across an external resistor. The driver output is latched in the logic, preventing multiple switch-on. The internal control voltage is inversely proportional to the external control pin voltage, with an offset of 1.5 V. This means that a voltage range from 1 to 1.5 V on pin CTRL will result in an internal control voltage range from 0.5 V to 0 V (a high external control voltage results in a small duty cycle). 7.4 Oscillator The maximum fixed frequency of the oscillator is set by an internal current source and capacitor. The maximum frequency is reduced once the control voltage enters the VCO control window. It then changes linearly with the control voltage until the minimum frequency is reached (see Figure 5 and Figure 6). Fig 5. The Vsense(max) voltage as a function of VCTRL Fig 6. The VCO frequency as a function of Vsense (max) 014aaa003 0.52 V 1 V (TYP) 1.5 V (TYP) Vsense(max) VCTRL 014aaa005 f 25 kHz 125 kHz VCO2 LEVEL VCO1 LEVEL Vsense(max) |
类似零件编号 - TEA1553T |
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类似说明 - TEA1553T |
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