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PI3546-00-LGIZ Datasheet(PDF) 28 Page - Vicor Corporation |
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PI3546-00-LGIZ Datasheet(HTML) 28 Page - Vicor Corporation |
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28 / 37 page  Cool-Power® Rev 1.3 vicorpower.com Page 28 of 37 2/2016 800 927.9474 PI354x-00 The transfer function of the error amplifier and compensator (also known as the Input To Control transfer function) reveals the response of a Type II amplifier with a low frequency pole determined by Equation (6), a zero which sets the mid-band gain determined by Equation (7) and a high frequency pole determined by Equation (8). Figure 58 shows the calculated Input To Control transfer function. Multiplying Equation (3) by Equation (5) ; described by Equation (9), results in the total loop gain (also known as the Output To Input transfer function). A graph is shown in Figure 58. The strategy is to set the zero such that the mid-band gain allows a high crossover frequency while providing maximum phase boost at crossover, with proper gain and phase margin. Lighting Mode (LGH) The Lighting (LGH) mode allows the PI354x-00 product family to be able to operate in constant current mode (CC) so that it can support a wide range of applications that require the ability to regulate current or voltage. Primary applications are LED lighting, battery / super-capacitor charging and high peak current pulse transient load applications. The PI354x-00 product family can operate in dual modes, either as a constant voltage (CV) regulator or a constant current (CC) regulator. Both modes can be utilized in a single system. The PI354x-00 family has a separate current amplifier, called LGH, and built in 100 mV lighting reference that has its output connected to the EAO pin internally. If the current through an external shunt starts to develop 100 mV at the LGH pin, the LGH amplifier will take over regulation by pulling down on the EAO output until the current is in regulation according to the designed shunt value. The LGH amplifier is a sink only trans-conductance amplifier (TCA). It does not source current. In the event of an open LED string or open current signal, the voltage loop can be set to regulate the output voltage to a safe or desired value in CV mode. When using the CC mode, it is important to set R1 and R2 appropriately to avoid voltage loop interaction with the current loop. In this case, the voltage setting at the EAIN pin should be set so that the error between it and the 1 V reference is sufficient to force the EAO to be open loop and source current always. When not using the LGH amplifier, the LGH pin should be connected to SGND. The LGH amplifier is able to sink more current than the error amplifier can source, thus avoiding arbitration issues when transitioning back and forth from LGH mode to voltage mode. The equation for setting the source current for EAO is shown in Equation (10). Figure 58 — PI354X Output-Input Gain/Phase 1 10 100 1000 10000 100000 1000000 50 0 50 100 0 50 100 150 Gain - dBV Phase-Degrees Frequency- Hz Ginctl(s) = GMeao • • (5) R OUT + s (Rzi • Ccomp • ROUT) R2 R1 + R2 1 + s • (Ccomp + Chf) + s2 • (Chf • Ccomp • Rzi) Fplf = = 33 Hz (6) 1 2 • π • (Rzi + R OUT) • (Ccomp + Chf) Fzmb = = 6.8 kHz (7) 1 2 • π • (Rzi // R OUT) • Ccomp Fphf = = 580 kHz (8) Chf + Ccomp 2 • π • (Rzi // R OUT) • Ccomp • Chf Goutin(s) = Gco(s) • Ginctl(s) (9) Figure 59 — Lighting Configuration Using CC Mode Vin Vout Cin Cout L1 VOUT VS1 LGH TRK EAIN EAO COMP VSN VSP VDIFF PI354X EN VIN SYNCI PGND SYNCO PWRGD TESTx VDR SGND Rshunt R1 R2 Rlgh RC Ieao = (Veain – Vref) • Gmea > 400 μA (10) |
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