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ISL6150CBZ-T Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL6150CBZ-T Datasheet(HTML) 11 Page - Intersil Corporation |
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11 / 19 page  11 FN9039.4 ISL6150 (H version; Figure 9): Under normal conditions (DRAIN < VPG), the Q3 DMOS will be on, shorting the bottom of the internal resistor to VEE, and turning Q2 off. If the pull-up current from the external module is high enough, the voltage drop across the 6.2kΩ resistor will look like a logic high (relative to DRAIN). Note that the module is only referenced to DRAIN, not VEE (but under normal conditions, the FET is on, and the DRAIN and VEE are almost the same voltage). When the DRAIN voltage is high compared to VPG, Q3 DMOS turns off, and the resistor and Q2 clamp the PWRGD pin to one diode drop (~0.7V) above the DRAIN pin. This should be able to pull low against the module pull-up current, and disable the module. Applications: GATE Pin To help protect the external FET, the output of the GATE pin is internally clamped; up to an 80V supply, it will not be any higher than 15V (nominal 14V). From about 18V down to 10V, the GATE voltage will be around 4V below the supply voltage; at 10V supply, the minimum GATE voltage is 5.4V (worst case is at -40°C). Applications: Optional Components In addition to the typical application, and the variations already mentioned, there are a few other possible components that might be used in specific cases. See Figure 29 for some possibilities. If the input power supply exceeds the 100V absolute maximum rating, even for a short transient, that could cause permanent damage to the IC, as well as other components on the board. If this cannot be guaranteed, a voltage suppressor (such as the SMAT70A, D1) is recommended. When placed from VDD to VEE on the board, it will clamp the voltage. If transients on the input power supply occur when the supply is near either the OV or UV trip points, the GATE could turn on or off momentarily. One possible solution is to add a filter cap C4 to the VDD pin, through isolation resistor R10. A large value of R10 is better for the filtering, but be aware of the voltage drop across it. For example, a 1kΩ resistor, with 1mA of IDD would have 1V across it and dissipate 1mW. Since the UV and OV comparators are referenced with respect to the VEE supply, they should not be affected. But the GATE clamp voltage could be offset by the voltage across the extra resistor. If there are negative transients on the DRAIN pin, blocking diodes may help limit the amount of current injected into the IC substrate. General purpose diodes (such as 1N4148) may be used. Note that the ISL6140 (L version) requires one diode, while the ISL6150 (H version) requires two diodes. One consequence of the added diodes it that the VPG voltage is offset by each diode drop. The switch SW1 is shown as a simple pushbutton. It can be replaced by an active switch, such as an NPN or NFET; the principle is the same; pull the UV node below its trip point, and then release it (toggle low). To connect an NFET, for example, the drain goes to UV; the source to VEE, and the gate is the input; if it goes high (relative to VEE), it turns the NFET on, and UV is pulled low. Just make sure the NFET resistance is low compared to the resistor divider, so that it has no problem pulling down against it. R8 is a pull-up resistor for PWRGD, if there is no other component acting as a pull-up device. The value of R8 is determined by how much current you want when pulled low (also affected by the VDD voltage); and you want to pull it low enough for a good logic low level. An LED can also be placed in series with R8, if desired. In that case, the criteria is the LED brightness versus current. R7 and C3 are used to delay the overcurrent shutdown, as described in the OV and UV section. Applications: “Brick” Regulators One of the typical loads used are DC/DC regulators, some commonly known as “brick” regulators, (partly due to their shape, and because it can be considered a “building block” of a system). For a given input voltage range, there are usually whole families of different output voltages and current ranges. There are also various standardized sizes and pinouts, starting with the original “full” brick, and since getting smaller (half-bricks and quarter-bricks are now common). Other common features may include: all components (except some filter capacitors) are self-contained in a molded plastic package; external pins for connections; and often an ENABLE input pin to turn it on or off. A hot plug IC, such as the ISL6140, is often used to gate power to a brick, as well as turn it on. Many bricks have both logic polarities available (Enable Hi or Lo input); select the ISL6140 (L version) and ISL6150 (H version) to match. There is little difference between them, although the L version output is usually simpler to interface. + - VEE VPG PWRGD DRAIN VDD + VIN+ VIN- ON/OFF VOUT+ VOUT- CL Q3 Q2 RPG 6.2k ACTIVE HIGH ENABLE MODULE (SECTION OF) ISL6150 (H VERSION) FIGURE 9. ACTIVE HIGH ENABLE MODULE (1.7V) ISL6140, ISL6150 |
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