ICE5QSAGXUMA1

ICE5QSAG Quasi-Resonant Controller Product Highlights         Novel Quasi-resonant operation and proprietary implementation for low EMI Enhanced Active Burst Mode with selectable entry and exit standby power Active Burst Mode to reach the lowest standby power VREF_B VCS_BL1 = 0.31 V 0.90 V 2.75 V 2 VFB < VREF_B VCS_BL2 = 0.35 V 1.05 V 2.75 V During IC first startup, the internal RefGOOD signal is logic low when VCC < 4 V. It will reset the Burst Mode level Detection latch. When the Burst Mode Level Detection latch is low and IC is in OFF state, the IC internal RFB resistor is disconnected from the FB pin and a current source Isel is turned on instead. From Vcc=4 V to Vcc on threshold, the FB pin will start to charge to a voltage level associated with RSel resistor. When Vcc reaches Vcc on threshold, the FB voltage is sensed. The burst mode thresholds are then chosen according to the FB voltage level. The Burst Mode Level Detection latch is then set to high. Once the detection latch is set high, any change of the FB level will not change the threshold selection. The current source Isel is turned off in 2 μs after VCC reaches VCC on threshold and the RFB resistor is re-connected to FB pin (see Figure 9). Vdd Isel S2 UVLO 2μs delay R RFB Ref good S1 FB Burst mode detection latch VCS_BLx VFB _E BL x Selection Logic Compare logic VREF_B RSel S Control unit Figure 9 Datasheet Burst mode detect and adjust 11 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Functional Description 3.5.1 Entering Active Burst Mode Operation For determination of entering Active Burst Mode operation, three conditions apply:  the feedback voltage is lower than the threshold of VFB_EBLX  the up/down counter is 8 for low line or 10 for high line and  the above two conditions remain after a certain blanking time tFB_BEB (20 ms). Once all of these conditions are fulfilled, the Active Burst Mode flip-flop is set and the controller enters Active Burst Mode operation. This multi-condition determination for entering Active Burst Mode operation prevents mis-triggering of entering Active Burst Mode operation, so that the controller enters Active Burst Mode operation only when the output power is really low during the preset blanking time. 3.5.2 During Active Burst Mode Operation After entering the Active Burst Mode the feedback voltage rises as VO starts to decrease due to the inactive PWM section. One comparator observes the feedback signal if the voltage level VFB_BOn is exceeded. In that case the internal circuit is power up to restart with switching. Turn-on of the power MOSFET is triggered by ZC counter with a fixed value of 8 ZC for low line and 10 ZC for high line. Turn-off is resulted if the voltage across the shunt resistor at CS pin hits the threshold VCS_BLX. If the output load is still low, the feedback signal decreases as the PWM section is operating. When feedback signal reaches the low threshold VFB_BOff , the internal circuit is reset again and the PWM section is disabled until next time VFB signal increases beyond the VFB_BOn threshold. In Active Burst Mode, the feedback signal is changing like a saw tooth between VFB_BOff and VFB_BOn (see Figure 10). 3.5.3 Leaving Active Burst Mode Operation The feedback voltage immediately increases if there is a high load jump. This is observed by a comparator with threshold of VFB_LB. As the current limit is VCS_BLX (31% or 35%) during Active Burst Mode, a certain load is needed so that feedback voltage can exceed VFB_LB. After leaving active burst mode, normal peak current control through VFB is re-activated. In addition, the up/down counter will be set to 1 (low line) or 3 (high line) immediately after leaving Active Burst Mode. This is helpful to minimize the output voltage undershoot. Datasheet 12 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Functional Description VFB Entering Active Burst Mode VFB_LB VFB_BOn VFB_BOff Leaving Active Burst Mode VFB_EBx Time to 8th/10th ZC and Blanking time (tFB_BEB) VCS t Current limit level during Active Burst Mode VCS_N VCS_BLx VVCC t VVCC_OFF VO t Max. Ripple < 1% t Figure 10 Signals in Active Burst Mode 3.6 Protection Functions The ICE5QSAG provides numerous protection functions which considerably improve the power supply system robustness, safety and reliability. The following table summarizes these protection functions. There are 3 different kinds of protection mode; non switch auto restart, auto restart and odd skip auto restart. The details can refer to the Figure 11, Figure 12 and Figure 13. Table 5 Protection functions Protection Functions Normal Mode Burst Mode Protection Mode Line Over Voltage √ Burst ON √ Brownout √ √ √ VCC Over Voltage √ √ NA1 VCC Under Voltage √ √ √ Not Applicable Datasheet Burst OFF √ Non switch Auto Restart Non switch Auto Restart Odd skip Auto Restart Auto Restart 1 13 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Functional Description Protection Functions Normal Mode Burst Mode Protection Mode Burst ON Burst OFF Over Load √ NA1 NA1 Odd skip Auto Restart Output Over Voltage √ √ NA1 Odd skip Auto Restart Over Temperature √ √ √ 3.6.1 Non switch Auto Restart Line Over Voltage The AC Line Over Voltage Protection is detected by sensing bus capacitor voltage through VIN pin via 2 potential divider resistors, Rl1 and Rl2 (see Figure 1). Once VVIN voltage is higher than the line over voltage threshold VVIN_LOVP, the controller enters Line Over Voltage Protection and it releases the protection mode after VVIN is lower than VVIN_LOVP. 3.6.2 Brownout The Brownout protection is observed by VIN pin similar to line over voltage Protection method with a different voltage threshold level. When VVIN voltage is lower than the brownout threshold (VVIN_BO), the controller enters Brownout Protection and it releases the protection mode after VVIN higher than brownin threshold (VVIN_BI). 3.6.3 VCC Ovder Voltage or Under Voltage During operation, the VCC voltage is continuously monitored. In case of a VCC Over Voltage or Under Voltage, the IC is reset and the main power switch is then kept off. After the VCC voltage falls below the threshold VVCC_OFF, the new start up sequence is activated. The VCC capacitor is then charged up. Once the voltage exceeds the threshold VVCC_ON, the IC begins to operate with a new soft-start. 3.6.4 Over Load In case of open control loop or output Over Load, the feedback voltage will be pulled up and exceed VFB_OLP. After a blanking time of tFB_OLP_B, the IC enters auto restart mode. The blanking time here enables the converter to operate for a certain time during a sudden load jump. 3.6.5 Output Over Voltage During off-time of the power MOSFET, the voltage at the ZCD pin is monitored for Output Over Voltage detection. If the voltage is higher than the preset threshold VZCD_OVP for 10 consecutive pulses, the IC enters Output Over Voltage Protection. 3.6.6 Over Temperature If the junction temperature of controller chip exceeds Tjcon_OTP, the IC enters into Over Temperature protection (OTP) Non switch auto restart mode. The controller implements with a 40°C hysteresis. In another word, the controller/IC can only resume from OTP if its junction temperature drops 40 °C from OTP trigger point. The over temperature protection of the controller chip shall prevent turn-on of the power supply if the component temperature is too high. For appropriate system protection, additional measures may have to be taken by the designer. Datasheet 14 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Functional Description Fault detected Fault released Start up and detect at every charging cycle VVCC Switching start at the following restartt cycle VCC_ON VCC_OFF VCS t No switching t Figure 11 Non switch Auto Restart Mode Fault detected Fault released Start up and detect at every charging cycle VVCC Switching start at the t cycle following restart VCC_ON VCC_OFF VCS t t Figure 12 Datasheet Auto Restart Mode 15 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Functional Description Fault detected Fault released Start up and detect at every even charging cycle VVCC No detect No detect Switching start at the following event restart cycle VCC_ON VCC_OFF VCS t t Figure 13 Datasheet Odd skip Auto Restart Mode 16 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Electrical Characteristics 4 Electrical Characteristics Attention: All voltages are measured with respect to ground (Pin 8). The voltage levels are valid if other ratings are not violated. 4.1 Absolute Maximum Ratings Attention: Stresses above the maximum values listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the integrated circuit. System design needs to ensure not to exceed the maximum limit. Ta=25°C unless otherwise specified. Table 6 Absolute Maximum Ratings Parameter Symbol Limit Values Unit Min. Max. Note / Test Condition VCC Supply Voltage VCC -0.3 27 V GATE Voltage VGATE -0.3 27 V SOURCE Voltage VSOURCE -0.3 27 V FB Voltage VFB -0.3 3.6 V ZCD Voltage VZCD -0.3 27 V CS Voltage VCS -0.3 3.6 V VIN Voltage VIN -0.3 3.6 V Maximum DC current at SOURCE pin ISOURCE - 0.9 A Limited by Tj,Max Single pulse source current at SOURCE pin IS_pulse - 5.8 A Pulse width tP=20 µs and limited by Tj,Max ESD robustness HBM VESD_HBM - 2000 V ESD robustness CDM VESD_CDM - 500 V According to EIA/JESD22 Junction temperature range TJ -40 150 °C Storage Temperature TSTORE -55 150 °C Thermal Resistance JunctionAmbient RthJA - 185 K/W 4.2 Setup according to the JESD51 standard Operating Range Note: Within the operating range the IC operates as described in the functional description. Table 7 Operating Range Parameter VCC Supply Voltage Junction Temperature of controller Datasheet Symbol VVCC TjCon_op Limit Values Min. Max. VVCC_OFF VVCC_OVP -40 17 of 27 TjCon_OTP Unit V ˚C Remark Max value limited due to OTP of controller chip V 2.1 2020-02-03 Quasi-Resonant Controller Electrical Characteristics 4.3 Operating Conditions Note: The electrical characteristics involve the spread of values within the specified supply voltage and junction temperature range TJ from – 40 °C to 125 °C. Typical values represent the median values, which are related to 25°C. If not otherwise stated, a supply voltage of VCC = 18 V is assumed. Table 8 Operating Conditions Parameter Symbol Limit Values Unit Note / Test Condition mA VVCC=0 V, RStartUp=50 MΩ and VDRAIN=90 V mA VVCC=3 V, RStartUp=50 MΩ and VDRAIN=90 V mA VVCC=15 V, RStartUp=50 MΩ and VDRAIN=90 V mA VVCC=15 V mA IFB=0 A (No gate switching) Min. Typ. Max. -0.35 -0.2 -0.09 - -3.2 - -5 -3 -1 - 0.19 - - 0.9 - Current Consumption, Auto Restart IVCC_AR - 320 - µA Current Consumption, Burst Mode IVCC_Burst Mode - 0.5 - mA VCC Turn-on Threshold Voltage VVCC_ON 15.3 16 16.5 V VCC Turn-off Threshold Voltage VVCC_OFF 9.5 10 10.5 V VCC Short Circuit Protection Voltage VVCC_SCP - 1.1 1.9 V VCC Turn-off blanking tVCC_OFF_B - 50 - µs VCC Charge Current IVCC_Charge1 IVCC_Charge2 IVCC_Charge3 Current Consumption, Startup Current IVCC_Startup Current Consumption, Normal IVCC_Normal 4.4 Internal Voltage Reference Table 9 Internal Voltage Reference Parameter Symbol VFB=1.8 V Limit Values Min. Typ. Max. VREF 3.2 3.4 Symbol Limit Values VGATE_LOW Typ. - Max. Output voltage at logic low Min. - 1.00 V Output voltage at logic high VGATE_HIGH 7.5 10 13 V Rise Time tGATE_RISE - 117 - ns Cout = 1nF Fall Time tGATE_FALL - 27 - ns Cout = 1nF Internal Reference Voltage 4.5 Gate Driver Table 10 Gate Driver Parameter Datasheet 18 of 27 3.3 Unit Note / Test Condition V Measured at pin FB IFB=0 Unit Note / Test Condition V 2.1 2020-02-03 Quasi-Resonant Controller Electrical Characteristics 4.6 PWM Section Table 11 PWM Section Parameter Symbol Limit Values Unit Min. Typ. Max. Feedback Pull-Up Resistor RFB 11 15 20 kΩ PWM-OP Gain GPWM 1.95 2.05 2.15 - Offset for Voltage Ramp VPWM 0.42 0.5 0.58 V Maximum on time in normal operation tOnMax 20 35 60 µs Maximum off time in normal operation tOffMax 24 42.5 71 µs Symbol Limit Values Peak current limitation in normal operation VCS_N Min. 0.94 Typ. 1.00 Max. 1.06 V Leading Edge Blanking time tCS_LEB 118 220 462 ns Peak Current Limitation in Active Burst Mode – Level 1 Peak Current Limitation in Active Burst Mode – Level 2 VCS_BL1 0.26 0.31 0.36 V VCS_BL2 0.3 0.35 0.4 V VCS_STG 0.06 0.10 0.15 V Abnormal CS voltage Consecutive Trigger PCS_STG - 3 - cycle Abnormal CS voltage Sample period tCS_STG_SAM 2.3 5 - µs Symbol Limit Values Soft-Start time tSS Min. 8.5 Typ. 12 Max. - ms Soft-start time step tSS_S - 3 - ms 4.7 Current Sense Table 12 Current Sense Parameter Abnormal CS voltage threshold 4.8 Soft Start Table 13 Soft Start Parameter 1 Unit Unit The parameter is not subjected to production test - verified by design/characterization Datasheet 19 of 27 Note / Test Condition Note / Test Condition Note / Test Condition 1 V 2.1 2020-02-03 Quasi-Resonant Controller Electrical Characteristics Internal regulation voltage at first step Internal regulation voltage step at soft start VSS11 - 0.30 - V CS peak voltage VSS_S1 - 0.15 - V CS peak voltage Unit Note / Test Condition 4.9 Digital Zero Crossing Table 14 Digital Zero Crossing Parameter Symbol Limit Values VZCD_CT Min. 60 Typ. 100 Max. 150 mV Zero crossing Ringing suppression VZCD_RS threshold Minimum ringing suppression time tZCD_RS1 - 0.45 - V 1.5 2.5 4.1 µs VZCD > VZCD_RS (except 1st 3 ms of soft-start) Maximum ringing suppression time Threshold to reset Up/Down Counter tZCD_RS2 - 25 - µs VZCD < VZCD_RS VFB_R - 2.80 - V Threshold for downward counting VFB_HLC - 2.05 - V Threshold for upward counting VFB_LHC - 1.55 - V Counter Time tCOUNT - 48 - ms ZCD resistance RZCD 2.5 3.0 3.5 kΩ VIN voltage threshold for line selection Blanking time for VIN voltage threshold for line selection VVIN_REF 1.48 1.52 1.58 V tVIN_REF - 16 - ms Zero crossing threshold voltage 4.10 Active Burst Mode Table 15 Active Burst Mode Parameter Symbol Limit Values Unit Min. Typ. Max. Charging current to select burst mode Isel 2.1 3 3.9 µA Burst mode selection reference voltage VREF_B 2.65 2.75 2.85 V Feedback voltage for entering Active Burst Mode for level 1 VFB_EBL1 0.86 0.9 0.94 V Datasheet 20 of 27 Internal resistor at ZCD pin Note / Test Condition V 2.1 2020-02-03 Quasi-Resonant Controller Electrical Characteristics Feedback voltage for entering Active Burst Mode for level 2 VFB_EBL2 1.0 1.05 1.1 V Blanking time for entering Active Burst Mode tFB_BEB - 20 - ms Feedback voltage for leaving Active Burst Mode VFB_LB 2.65 2.75 2.85 V Feedback voltage for burst-on VFB_BOn 2.3 2.4 2.5 V Feedback voltage for burst-off VFB_BOff 1.9 2.0 2.1 V 4.11 Line Over Voltage Protection Table 16 Line OVP Parameter Symbol Limit Values Unit Min. Typ. Max. Line Over Voltage threshold VVIN_LOVP 2.8 2.9 3.0 V Line Over Voltage Blanking tVIN_LOVP_B - 250 - µs 4.12 Brownout Protection Table 17 Brownout Protection Parameter Symbol Limit Values BrownIn threshold BrownIn Blanking BrownOut threshold VVIN_BI tVIN_BI_B VVIN_BO BrownOut Blanking tVIN_BO_B Min. 0.63 0.37 - 4.13 VCC Over Voltage Protection Table 18 Vcc Over Voltage Protection Parameter Symbol Typ. 0.66 250 0.40 250 Unit Max. 0.69 0.43 - Limit Values Typ. Max. µs VCC Over Voltage threshold VVCC_OVP 24 25.50 27 V VCC Over Voltage blanking tVCC_OVP_B - 50 - µs 4.14 Over Load Protection Table 19 Overload Protection Parameter Symbol Limit Values Min. Datasheet 21 of 27 Typ. Unit Max. Note / Test Condition V µs V Unit Min. Note / Test Condition Note / Test Condition Note / Test Condition V 2.1 2020-02-03 Quasi-Resonant Controller Electrical Characteristics Over Load Detection threshold for OLP protection at FB pin VFB_OLP 2.65 2.75 2.85 V Over Load Protection Blanking Time tFB_OLP_B - 30 - ms 4.15 Output Over Voltage Protection Table 20 Output OVP Parameter Symbol Limit Values Unit Min. Typ. Max. Note / Test Condition Output Over Voltage threshold VZCD_OVP 1.9 2 2.1 V Output Over Voltage Blanking Pulse PZCD_OVP_B - 10 - pulse Consecutive Pulse Unit Note / Test Condition Junction temperature of the controller chip 4.16 Thermal Protection Table 21 Thermal Protection Parameter Symbol Limit Values Tjcon_OTP Min. 129 Typ. 140 Max. 150 °C Over temperature Hysteresis TjHYS_OTP - 40 - °C Over temperature Blanking Time tjcon_OTP_B - 50 - µs Over temperature protection 1 1 4.17 Low side MOSFET Table 22 Low side MOSFET Parameter Drain Source On-Resistance Symbol RDSon Limit Values Min. Typ. Max. - 0.22 0.311 0.29 - The parameter is not subjected to production test - verified by design/characterization Datasheet 22 of 27 Unit Note / Test Condition Ω Ω Tj = 25°C Tj = 125°C 1 V 2.1 2020-02-03 Quasi-Resonant Controller Output power curve 5 Output power curve The calculated output power curves versus ambient temperature are shown below. The curves are derived based on a typical DCM flyback in an open frame design setting the maximum TJ at 125 °C, using minimum pin copper area in a 2 oz copper single sided PCB and steady state operation only (no design margins for abnormal operation modes are included). The output power figure is for reference only. The actual power can vary depending on a particular design. In a power supply system, appropriate thermal design margins must be considered to make sure that the operation of the device is within the maximum ratings given in section 4.1. Figure 14 Datasheet Output power curve of ICE5QSAG 23 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Outline Dimension 6 Outline Dimension Figure 15 PG-DSO-8 Datasheet 24 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Marking 7 Marking Figure 16 Marking for ICE5QSAG Datasheet 25 of 27 V 2.1 2020-02-03 Quasi-Resonant Controller Revision history Revision history Document version Date of release Description of changes V 1.2 10 Mar 2017 Page 1, 3 Updated features and description Page 6 ~ 14 Typo error V 2.0 11 Aug 2017 Page 7 ~16 Text content revised V 2.1 3 Feb 2020 Update of CS pin function and description (refer to errata sheet ES_2001_PL83_2002_024629) Datasheet 26 of 27 V 2.1 2020-02-03 Trademarks All referenced product or service names and trademarks are the property of their respective owners. Edition 2020-02-03 Published by Infineon Technologies AG 81726 München, Germany © 2020 Infineon Technologies AG. All Rights Reserved. Do you have a question about this document? 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