SSC1S311A

SSC1S311A SANKEN | Alldatasheet

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Technical content

Datasheet sections

Features

• Multi-Mode Control (High efficiency operation in all range of loads)
• Automatic Standby Function (Standby power is inproved by burst oscillation mode)
• Input Power at No Load: <30mW at 100VAC <50mW at 230VAC
• Bottom-Skip Function (Switching loss in medium to low loads is reduced)
• Step-on Burst Oscillation Function (Transformer audible noises are reduced)
• Bias Assist Function
• Soft-Start Function
• Adjustable Startup Voltage
• Maximum On-time Limitation Function
• VCC Operational Range Expanded
• Leading Edge Blanking (LEB) Function (External Filter Components are reduced)
• Protection Functions Overcurrent Protection (OCP): Pulse-by-pulse Overvoltage Protection (OVP): Auto-restart Overload Protection (OLP): Auto-restart Thermal Shutdown (TSD): Auto-restart Typical Application VAC D2 R2 T1 D4 R11 D P S PC1 PC1C4 ROCP R10 C8CV VOUT GND 1 2 4 GND VCC BDFB/OLP ST OCP DRV 8 7 6 5 SSC1S311A D3 R5 RBD2 RBD1 DZBD CBD R12 RST Packages SOIC8 Not to scale Specifications
• VCC Maximum rating: 35 V
• Operation Start Voltage,VCC(ON): 15.1 V (typ.)
• PWM Operation Frequency, fOSC: 21.0 kHz (typ.)
• Maximum On-time, tON(MAX): 40.0 µs (typ.)

Applications

• Digital Appliance
• Office Automation (OA) Equipment
• White Goods
• Industrial Apparatus
• Communication Facilities

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 3 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 1. Absolute Maximum Ratings Current polarities are defined as follows: current going into the IC (sinking) is positive current (+); current coming out of the IC (sourcing) is negative current (−). Unless otherwise specified, TA = 25 °C. Parameter Symbol Conditions Pins Rating Unit Supply Voltage of Control Part VCC 7 − 8 35 V Startup Pin Voltage VST 4 − 8 −0.3 to 600 V OCP Pin Voltage VOCP 6 − 8 −2.0 to 6.0 V FB Pin Voltage VFB 1 − 8 −0.3 to 7.0 V FB Pin Current IFB 1 − 8 10.0 mA BD Pin Voltage VBD 2 − 8 −6.0 to 6.0 V Allowable Power Dissipation PD ― 0.14 W Operating Ambient Temperature TOP ― −40 to 125 °C Storage Temperature Tstg ― −40 to 125 °C Junction Temperature Tj ― 150 °C

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 4 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 2. Electrical Characteristics Current polarities are defined as follows: current going into the IC (sinking) is positive current (+); current coming out of the IC (sourcing) is negative current (−). Unless specifically noted, TA = 25 °C, VCC = 20 V. Parameter Symbol Conditions Pins Min. Typ. Max. Unit Power Supply Startup Operation Operation Start Voltage VCC(ON) 7−8 13.8 15.1 17.3 V Operation Stop Voltage(1) VCC(OFF) 7−8 8.4 9.4 10.7 V Circuit Current in Operation ICC(ON) 7−8 ― 1.3 3.7 mA Circuit Current in Non-Operation ICC(OFF) VCC = 13 V 7−8 ― 4.5 50 μA Startup Circuit Operation Voltage VSTART(ON) 4−8 18 21 24 V Startup Current ICC(STARTUP) VCC = 13 V 7−8 −4.5 −3.1 −1.0 mA Startup Current Supply Threshold Voltage(1) VCC(BIAS) 7−8 9.5 11.0 12.5 V PWM Operation Frequency fOSC 5−8 18.4 21.0 24.4 kHz Soft-Start Operation Period tSS 5−8 ― 6.05 ― ms Normal Operation Bottom-Skip Operation Threshold Voltage 1 VOCP(BS1) 6−8 0.487 0.572 0.665 V Bottom-Skip Operation Threshold Voltage 2 VOCP(BS2) 6−8 0.200 0.289 0.380 V Quasi-Resonant Operation Threshold Voltage 1(2) VBD(TH1) 2−8 0.14 0.24 0.34 V Quasi-Resonant Operation Threshold Voltage 2(2) VBD(TH2) 2−8 0.07 0.17 0.27 V Maximum Feedback Current IFB(MAX) 1−8 −320 −205 −120 μA Standby Operation Standby Operation Threshold Voltage VFB(STBOP) 1−8 0.45 0.80 1.15 V Protection Operation Maximum On-time tON(MAX) 5−8 30.0 40.0 50.0 µs Leading Edge Blanking Time tBW 5−8 ― 495 ― ns Overcurrent Detection Threshold Voltage (Normal Operation) VOCP(H) 6−8 0.820 0.910 1.000 V Overcurrent Detection Threshold Voltage (Input Compensation in Operation) VOCP(L) VBD = −3 V 6−8 0.560 0.660 0.760 V BD Pin Current IBD(O) VBD = −3 V 2−8 −250 −83 −30 μA OLP Bias Current IFB(OLP) VFB/OLP = 5V 1−8 −15 −10 −5 μA OLP Threshold Voltage VFB(OLP) 1−8 5.50 5.96 6.40 V Circuit Current after OLP ICC(OLP) 7−8 ― 575 ― μA VCC Pin OVP Threshold Voltage VCC(OVP) 7−8 28.5 31.5 34.0 V FB Pin Maximum Voltage in Feedback Operation VFB(MAX) IFB = −12µA 1−8 3.70 4.05 4.40 V (1) VCC(BIAS) > VCC(OFF) (2) VBD(TH1) > VBD(TH2)

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 5 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 Parameter Symbol Conditions Pins Min. Typ. Max. Unit Thermal Shutdown Temperature Tj(TSD) ― 135 ― ― °C Drive Circuit DRV Pin Output Voltage VDRV 5−8 7.5 8.1 8.7 V DRV Pin Source Current (Peak) IDRV(SO) 5−8 ― −150 ― mA DRV Pin Sink Current (Peak) IDRV(SI) 5−8 ― 608 ― mA Thermal Characteristics Thermal Resistance θj-A ― ― ― 180 °C /W

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 6 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 3. Block Diagram 4. Pin Configuration Definitions FB/OLP BD ST DRV OCP GND VCC Number Name Function

1 FB/OLP Constant voltage control, standby control, and

Overload detection signal input

2 BD Bottom detection and input compensation signal

3 ― (Pin removed)

4 ST Startup current input

5 DRV Gate drive output

6 OCP Overcurrent detection signal input

7 VCC Supply voltage input and overvoltage detection

8 GND Ground

5 DRV

6 OCP

1 FB/OLP

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 8 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 6. Physical Dimensions NOTES: - Dimensions in millimeters - Bare lead frame: Pb-free (RoHS compliant) 7. Marking Diagram Part Number S C 1 S 3 1 1 S K Y M D A Control Number Lot Number : Y is the last digit of the year of manufacture (0 to 9) M is the month of the year (1 to 9, O, N, or D) D is the period of days represented by : 1: the first 10 days of the month (1st to 10th) 2: the second 10 days of the month (11th to 20th) 3: the last 10–11 days of the month (21st to 31st)

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 14 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 Threshold Voltage 2, V BD(TH2) = 0.17V, the power MOSFET turns on again. In addition, at this point, the threshold voltage automatically increases to V BD(TH1) to prevent malfunction of the quasi -resonant operation from noise interference.

• RBD1 and RBD2 Setup RBD1 and R BD2 must set the range for the quasi - resonant signal , VBD(TH1) = 0.34V(max.) or more under input and output conditions where V CC becomes lowest, but less than the absolute maximum rating of the BD pin, 6.0V, under conditions where VCC becomes highest. The target voltage of E rev2 is about 3.0V, and the effective pulse width must be 1.0µs or more between the two points V BD(TH1) = 0.34 V (max.) and V BD(TH2) = 0.27 V (max.)
• CBD Setup The delay time, t ONDLY, after which the power MOSFET turns on, is adjusted by the value of C BD, so that the power MOSFET turns on a t the bottom -on of VDS as shown in Figure 8-12, while the power MOSFET drain voltage, V DS, the drain current, ID, and the quasi - resonant signal, under the maximum input voltage and the maximum output power . An initial reference value for CBD is about 1000pF. The following show how to adjust the turn-on point:
• If the turn -on point precedes the bottom of the V DS signal (see Figure 8-14), it causes higher switching losses. In that situation, after confir ming the initi al turn-on point, delay the turn -on point by increasing the CBD value gradually, so that the turn-on will match the bottom point of VDS.
• In the converse situation, if the turn -on point lags behind the VDS bottom point (see Figure 8-15), it causes higher switching losses also. After confirming the initial turn -on point, advance the turn-on point by decreasing the CBD value gradually, so that the turn-on will match the bottom point of VDS. GND VCC BD ST OCP D2 R2 D P ROCP CV Q1 RBD2 RBD1 DZBD CBD Erev2 EIN EFLY EIN Flyback voltage Forward voltage Efw1 Erev1 ｔON Auxiliary Winding Voltage Waveform Erev2 0 VBD(TH1)VBD(TH2) Clamping Snubber R12 About 3.0 V recommended , but less than 6.0 V acceptable BD pin Voltage Waveform RST Figure 8-13. BD Pin Peripheral Circuit (Left) and Auxiliary Winding Voltage (Right)

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 18 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 Normal operation Standby operation Normal operation Burst oscillationOutput current, IOUT Drain current, ID Below several kHz Figure 8-21. Auto Standby Mode Timing 8.5. Overvoltage Protection (OVP) When the voltage between the V CC pin and GND pin increases to the OVP Operation Thresh old Voltage , VCC(OVP) = 31.5V, the overvoltage protection function (OVP) is activated and stops switching operation. While the OVP function is active, because the Bias Assist function is disabled, the V CC pin voltage decreases to V CC(OFF) = 9.4V. Because t he UVLO (Undervoltage Lockout) circuit becomes active, the control circuit stops operation, and the IC reverts to the state before startup. Then, when the V CC pin voltage increases due to the startup current and reaches VCC(ON) = 15.1V, the control circuit returns to normal operation again. In this way, the intermittent oscillation mode is operated by the UVLO circuit repeatedly while there is an excess voltage condition. By this intermittent oscillation, stress on components, such as the power MOSFET and t he secondary rectifier diode, is reduced. Furthermore, because the switching period is shorter than an oscillation stop period, power consumption under intermittent operation can be minimized. When the fault condition is removed, the IC returns to normal operation automatically. When the auxiliary winding supplies the V CC pin voltage, the OVP function is able to detect an excessive output voltage, such as when the detection circuit for output control is open on the secondary side, because the VCC pin voltage is proportional to the output voltage. The output voltage of the secondary side at OVP operation, V OUT(OVP), is calculated approximately as follows: )V(.531×)operationnormal(V )operationnormal(V V CC OUT OUT(OVP) = (3) 8.6. Overload Protection (OLP) When the drain peak current is limited by OCP operation, the output voltage, V OUT, decreases and the feedback current from the secondary photo -coupler, I FB (see Figure 8-22), becomes zero . As a result, the FB/OLP pin voltage increases, charging the capacitor C4, until this voltag e increases to V FB(MAX) = 4.05V. After that, the capacitor C4 is charged by I FB(OLP) = −10µA. When the FB/OLP pin voltage increases to VFB(OLP) = 5.96V, the IC stops switching operation. When the OLP function is activated, the Bias Assist function is disabled, as mentioned in Section 8.5, and intermittent mode op eration by the UVLO circuit is performed repeatedly. When the fault condition is removed, the IC returns to normal operation automatically. The time o f the FB/OLP pin voltage from VFB(MAX) = 4.05V to VFB(OLP) = 5.96V is defined as the OLP Delay Time, t DLY. Because the capacitor C3 for phase compensation is small compared to C4, in the case of I FB(OLP) = –10μA, the approximate value of t DLY is determined as follows: ( ) )OLP(FB )MAX(FB)OLP(FB DLY I 4C×VV t ≒ ( ) A)μ(10 4C×)V(05.4)V(96.5= (4) In the case of C4 = 4.7μF, the value of t DLY would be approximately 0.9s. The recommended value of R1 is 47kΩ.

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 24 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 Each parameter, such as the peak drain current, I DP, is calculated as follows: VPONDLY C'Lπt ××= (11) ( )ONDLY0ONON tf1D'D ×−= (12) IN(MIN)2 O IN E 1PI ×η= (13) I2I ON IN DP ×= (14) ValueAL 'LN P P −= (15) where: tONDLY is the delay time of quasi-resonant operation, IIN is the average input current, η2 is the conversion efficiency of the power supply, IDP is the peak drain current DON' is the on-duty after compensation, and VO is the secondary side output voltage The minimum operation frequency of quasi -resonant operation, fO, can be calculated by Equation (17) In transformer design, AL-value and NP must be set in a way that the ferrite core does not saturate. Here, use ampere turn value (AT), the result of I DP × N P and the graph of NI -Limit (AT) versus AL-value (Figure 9-2 is an example of it). NI -Limit is the limit that the ampere turn value should not exceed; otherwise the core saturates. When choosing a ferrite core to match the relationship of NI-Limit (AT) versus AL-value, it is recommended to set the calculated NI-Limit value below about 30% from the NI-Limit curve of ferrite core data, as shown in the hatched area containing the design point in Figure 9-2, to provide a design margin in consideration of temperature effects and other variations. ( ) ON)MIN(INV P V ON)MIN(IN O O DEC2π CDE4π η η f ××× ××× +×+×− (17) Figure 9-2. Example of NI -Limit vs. AL-Value Characteristics

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 27 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 D2 R2 D P PC1C4 CV GND VCC BD FB/OLP ST OCP SSC1S311A RBD2 RBD1 DZBD CBD ROCP D3 R5 S Main power circuit trace GND trace for the IC DRV A Secondary rectifier trace R12 RST Figure 9-7. Peripheral Circuit Example around the IC (SSC1S311A)

SSC1S311A-DSE Rev.1.3 SANKEN ELECTRIC CO., LTD. 28 Dec. 22, 2017 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2012 Important Notes

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