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LTC4085 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4085 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page LTC4416/LTC4416-1 4416fa OPERATIO The band-gap reference provides internal bias currents used by the channel 1 and channel 2 controllers. It also provides a precision voltage reference, VREF,usedbycom- parators C1 and C2. The band-gap reference is powered as long as a minimum operational voltage is present on either V1, V2, or VS. The C1 and C2 comparators provide a fixed comparison between the E1 and E2 inputs, respectively, and the in- ternal VREF signal. The comparator outputs are directly represented by the H1 and H2 open-drain outputs. The output states of H1 and H2 are not dependent upon the relative voltage difference between VV1 – VVS and VV2 – VVS, respectively. If VE1 is less than VREF, the H1 open-drain output will be low impedance to GND. If VE2 is less than VREF, the H2 open-drain output will be low impedance to GND. The A1 and A2 circuits act both as a high side transconductance amplifiers and as comparators. Both A1 and A2 act identically when the analog controllers are fully enabled. The relationship of the G1 current is represented by Figure 1. When VV1 – VVS < VRTO, the A1 activates the reverse turn- off condition and the IG1 current is IG(OFF). When VRTO < VV1 – VVS < VFR, the A1 acts as a class A output and the IG1 current is fixed at IG(SRC). As the VV1 – VVS voltage VV1 – VVS 4416 F01 IG1 VRTO VFR VFON IGFON(SNK) IG(SNK) IG(SRC) IG(OFF) NOT DRAWN TO SCALE Figure 1. IG1 vs VV1 – VVS approachestheforwardregulationvoltage,VFR,theIG(SNK) current will be proportional to VV1 – VVS. When VV1 – VVS > VFON, the A1 activates the fast-on condition, tG(ON), and the IG1 current is set to IGFON(SNK). LTC4416 OPERATION The interaction of the LTC4416 analog controllers distin- guish the operation of the LTC4416 from a simple circuit using two PowerPath controllers. Table 1 explains the different operation modes of the analog controllers. Table 1. LTC4416 Operational Modes E1 E2 Operation Mode IG(OFF)1 IG(OFF)2 1 0 Load Sharing Enabled Enabled 1 Sense V1 is Less Than V2 Enabled Sense 0 V1 is Greater Than V2 Enabled 0 X Channel 1 Disabled. Do Not Use Disabled X 1 Channel 2 Disabled. Do Not Use Disabled 0 1 Both Channels Disabled Disabled Disabled The LTC4416 has six modes of operation. Each mode of operation is dependent upon the configuration of the E1 and E2 input pins. Load Sharing Operation The load sharing mode configures the LTC4416 into two independent PowerPath controllers. This is accomplished by fully enabling both the first analog controller and the second analog controller. Both channels will implement the gate drive outlined in Figure 1. V1 is Less Than V2 Operation Channel 1 is fully enabled. If VV1 – VVS < VRTO, channel 1 will implement all of the IG1 currents listed in Figure 1. When VE2 is above the VREF threshold, channel 2 is in a “soft-off mode”. This means that G2 will only provide an IG(SRC) current instead of either an IG(SRC) or an IG(OFF) current. When VE2 is below the VREF threshold, channel 2 is fully enabled, and G2 will become active implementing the IG output current listed in Figure 1. |
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