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CS1611A Datasheet(PDF) 10 Page - Cirrus Logic |
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CS1611A Datasheet(HTML) 10 Page - Cirrus Logic |
10 / 18 page CS1610A/11A CS1612A/13A 10 DS976PP4 5.4.1 Maximum Peak Current The maximum boost inductor peak current is set using external resistor RIPK on pin IPK, which is sampled periodically by an ADC. Maximum power output is proportional to peak current code IPK(code). See Equation 1: where, = a correction term of 0.55 Vrms(typ) = nominal operating input RMS voltage IPK(BST) = peak current code IPK(code) 4.1mA Resistor RIPK is calculated using peak current code IPK(code). See Equation 2: 5.4.2 Output BSTOUT Sense & Input IAC Sense A current proportional to boost output voltage VBST is supplied to the IC on pin BSTOUT and is used as a feedback control signal (see Figure 12). The ADC is used to measure the magnitude of current IBSTOUT through resistor RBST. The magnitude of current IBSTOUT is then compared to an internal reference current Iref of 133A. Resistor RBST sets the feedback current at the nominal boost output voltage. For the CS1611A/13A, resistor RBST is calculated as shown in Equation 3: where, VBST = nominal boost output voltage Iref = internal reference current For 120VAC line voltage applications (CS1610A/12A), nominal boost output voltage VBST is 200V, and resistor RBST is 1.5M. By using digital loop compensation, the voltage feedback signal does not require an external compensation network. A current proportional to the AC input voltage is supplied to the IC on pin IAC and is used by the boost control algorithm (see Figure 13). Resistor RIAC sets current IAC and is defined in Equation 4: For optimal performance, capacitor CIAC should be connected from pin IAC to ground in 230V circuits using the CS1611A or CS1613A. Resistors RIAC and RBST should use 1% or better resistors for best VBST voltage accuracy. 5.4.3 Boost Auxiliary Winding The boost auxiliary winding is used for zero-current detection (ZCD). The voltage on the auxiliary winding is sensed through the BSTAUX pin of the IC. It is also used to deliver current during steady-state operation, as mentioned in section 5.2 Startup Circuit on page 8. 5.4.4 Boost Overvoltage Protection The CS1610A/11A/12A/13A supports boost overvoltage protection (BOP) to protect the bulk capacitor C8 (see Figure 15). If the boost output voltage exceeds the overvoltage protection thresholds of 249V for a 120V system, or 448V for a 230V system, a BOP fault signal is generated. The control logic continuously averages this BOP fault signal, and if at any point in time the average exceeds a set event threshold, the boost stage is disabled. The BOP fault averaging algorithm sets the event threshold such that the boost output voltage is never allowed to stay above the BOP threshold for more than 1.6ms. During a boost overvoltage protection event, the second stage is kept enabled, and its dim input is railed to full scale. This allows the second stage to dissipate the stored energy on bulk capacitor C8 quickly, bringing down the boost output voltage to a safe value. A visible flash on the LED might appear, indicating that an overvoltage event has occurred. When the boost output voltage drops to 195V for a 120V application or 368V for a 230V application, the boost stage is enabled, and the system returns to normal operation. PIN max I PK BST Vrms typ 2 ------------------------------------------------------------- = [Eq.1] RIPK 4M IPK code ----------------------- = [Eq.2] VBST CS1610 A/ 11A/ 12A/13A 15k ADC R8 RBST IBSTOUT R9 Iref 16 BSTOUT 12 Figure 12. BSTOUT Input Pin Model RBST VBST Iref -------------- 400V 133 A ------------------ 3M == [Eq.3] R3 RIAC IAC I AC Vrect 15k ADC R4 2 Iref 12 CS1610 A/11A/12A/13A CIAC Figure 13. IAC Input Pin Model RIAC RBST = [Eq.4] |
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