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TD230 bảng dữ liệu(PDF) 8 Page - STMicroelectronics |
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TD230 bảng dữ liệu(HTML) 8 Page - STMicroelectronics |
8 / 15 page To avoid cumulative charging of the protection capacitors CTRIP 1/2 in case of successive overcur- rent conditions, the capacitors CTRIP 1/2 are con- Figure 3 : Fault Time Limitation stantly discharged by another fixed current source IP/N3 which value is a fourth of IP/N2 (1 µA). Trace 1 represents the CBOOST Voltage (0 to 5+13,4 = 18,4V) Trace 2 represents the CTRIP1 Voltage. The value of the capacitors CTRIP 1/2 should be chosen in relation with the required protection time as indicated in equation (iv) : • CTRIP1/2 =(IP/N2 - IP/N3)x tPROTECT1/2 /VSPN/3(iv) where tPROTECT 1/2 is the time defined by the user before a definitive resettable shutdown of MOS- FET 1/2. Equation (iv) can be translated to : • CTRIP 1/2 =tPROTECT 1/2 x3µA / 1.20V (iv) Note that the positive power supply disjonction leads to the negative power supply disjonction, whereas the opposite is not true. 2.3. Step-Up Converter To ensure proper voltage on the gate of the positive supply NMOS1 (VGS = 13.4V typ), the TD230 inte- grates a step-up converter which is to be boosted with two small low cost external components : an inductor LBOOST and a capacitor CBOOST, as shown in figure 4. Rs e ns e MOS Lboos t C boos t Se ns e Step Up Driver TD230 Figure 4 : Step Up Converter External Components The principle of this inductive step-up converter is to pump charges in the tank capacitor CBOOST following the equation (v) : Lboos t Cboos t TD230 Os c Re gulation Figure 5 : Internal Step Up Schematic • V(CBOOST)= VCC+ + 13.4V typ (v) Charges are pumped by means of an oscillator commanded switch, and stored in the CBOOST tank capacitor through a diode as shown on figure 5. Wh en th e vo lt a ge across CBOOST reaches VCC ++13.4V typ, the oscillator is stopped. This creates a ripple voltage with an amplitude of 0.2V. Note that the min and max values of V(CBOOST) comprised between VCC + +10V and VCC+ +15V already take the ripple voltage into account. TD230 8/15 |
Số phần tương tự - TD230 |
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Mô tả tương tự - TD230 |
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