BM2P26CK-EVK-001

Isolated Flyback Type PWM Mode BM2P26CK-Z Evaluation Board Notice ＜High Voltage Safety Precautions＞ ◇ Read all safety precautions before use Please note that this document covers only the BM2P26CK-Z evaluation board (BM2P26CK-EVK-001) and its functions. For additional information, please refer to the datasheet. To ensure safe operation, please carefully read all precautions before handling the evaluation board Depending on the configuration of the board and voltages used, Potentially lethal voltages may be generated. Therefore, please make sure to read and observe all safety precautions described in the red box below. Before Use [1] Verify that the parts/components are not damaged or missing (i.e. due to the drops). [2] Check that there are no conductive foreign objects on the board. [3] Be careful when performing soldering on the module and/or evaluation board to ensure that solder splash does not occur. [4] Check that there is no condensation or water droplets on the circuit board. During Use [5] Be careful to not allow conductive objects to come into contact with the board. [6] Brief accidental contact or even bringing your hand close to the board may result in discharge and lead to severe injury or death. Therefore, DO NOT touch the board with your bare hands or bring them too close to the board. In addition, as mentioned above please exercise extreme caution when using conductive tools such as tweezers and screwdrivers. [7] If used under conditions beyond its rated voltage, it may cause defects such as short-circuit or, depending on the circumstances, explosion or other permanent damages. [8] Be sure to wear insulated gloves when handling is required during operation. After Use [9] The ROHM Evaluation Board contains the circuits which store the high voltage. Since it stores the charges even after the connected power circuits are cut, please discharge the electricity after using it, and please deal with it after confirming such electric discharge. [10] Protect against electric shocks by wearing insulated gloves when handling. This evaluation board is intended for use only in research and development facilities and should by handled only by qualified personnel familiar with all safety and operating procedures. We recommend carrying out operation in a safe environment that includes the use of high voltage signage at all entrances, safety interlocks, and protective glasses. www.rohm.com © 2018 ROHM Co., Ltd. All rights reserved. HVB01E User’s Guide AC/DC Converter (Output 2.5 W 5 V) Isolated Flyback Type PWM Mode BM2P26CK-Z Evaluation Board BM2P26CK-EVK-001 General Description This evaluation board’s output voltage is 5 V for an input voltage 90 Vac to 264 Vac and the maximum output current is 0.5 A. The BM2P26CK-Z is an AC/DC flyback converter in PWM Mode with integrated 800 V MOSFET. BM2P26CK-Z contributes to low power consumption. The built-in 650 V startup circuit in Current is restricted in each cycle and excellent performance is achieved in bandwidth and transient response since current mode control is utilized. load, the switching frequency is reduced and high efficiency is achieved. The switching frequency is operating at 100 kHz. Built-in the low on resistor (6.0 Ω) and high voltage tolerant MOSFET (800 V) make designs easy. (achieved) IEC62368-1 standard authorization. At light A built-in frequency hopping function contributes to low EMI. The BMP2P26CK-Z has reached This evaluation board is compliant with CISPR22 Class. B which is the test of the noise pin voltage and emission by an optimum EMI design. Figure 1. BM2P26CK-EVK-001 Electronics Characteristics Not guarantee the characteristics is representative value. Parameter Input Voltage Range Input Frequency Output Voltage Maximum Output Power (Note 1) Output Current Range Standby Power Power Efficiency Output Ripple Voltage(Note 2) Operating Temperature Range Unless otherwise noted, V IN = 230 Vac, I OUT = 0.5 A, Ta = 25 °C Min Typ Max Units 90 230 264 V 47 50/60 63 Hz 4.75 5.00 5.25 V - - 2.5 W 0.0 0.5 0.5 A - 40 - mW 65 71.1 - % - 60 - mVpp -10 +25 +65 °C Conditions I OUT = 0.5 A I OUT = 0 A (Note 1) Adjust operating time, within any parts surface temperature under 105 °C (Note 2) Not include spike noise. © 2019 ROHM Co., Ltd. 1/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Operation Procedure 1 Necessary Equipment (1) AC power supply (90 Vac to 264 Vac, 10 W or more) (2) Load equipment (0.5 A at maximum value) (3) DC voltmeter 2 Connect to Each Equipment (1) Set the AC power supply to 90 Vac to 264 Vac with power supply off. (2) Set the load 0.5 A or less. (3) Connect the N pin of the power supply to the CN1-1: AC (N) pin and the L pin to the CN1-2: AC (L) pin with mains cable (wires) (4) Connect the plus pin of load to the CN2-2 (VOUT) pin and the minus pin to the CN2-1 (GND) pin with output cable (wires). (5) Connect the wattmeter to the power supply in order to measure input voltage and current. (6) Connect the plus pin of the DC voltmeter to the CN2-2 (VOUT) pin and the minus pin to the CN2-1 (GND) pin in order to measure the output voltage. (7) Turn on the output of the AC power supply. (8) Confirm that the DC voltmeter displays 5 V. (9) Enable the load. (10) Confirm by the DC voltmeter whether the voltage effect is occurred by the resistance of wires. Load V AC power supply wattmeter CN1-1 AC (N) CN2-2 VOUT CN1-2 AC (L) DC voltmeter CN2-1 GND Figure 2. Diagram of How to Connect © 2019 ROHM Co., Ltd. 2/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Application Circuit The flyback topology is adopted in this evaluation board. The BM2P26CK-Z has a built in Super Junction MOSFET which is high voltage tolerant V DSS : 800 V and low resistance R DS(ON) : 6.0 Ω, and this MOSFET contributes to make the power consumption low. It monitors the output voltage (VOUT) by the feedback circuit and feeds back to the FB pin of the BM2P26CK-Z through the optocoupler. At startup, the voltage from the VH pin is supplied to the VCC pin thorough the startup circuit and it makes the VCC pin voltage increase. When the VCC pin voltage exceeds the UVLO released voltage 15.50 V (Typ), the BM2P26CK-Z switch begins. After start of switching, the startup circuit is turned off and it cut the supply from the VH pin, in order to have low power consumption for instance in standby mode. value is 0.192 A (Min). In addition, the BM2P26CK-Z has a built in current detection resistor of which the over current detection The residual voltage discharge circuit of the insert power supply plug (X capacitor discharge function) is built in the IC and it is possible to make the value of X capacitor large. Figure 3. Application Circuit Figure 4. Wave Form of Residual Voltage © 2019 ROHM Co., Ltd. 3/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 General Description of BM2P26CK-Z Key Specifications Features  X Capacitor Discharge Function   PWM Current Mode VCC Pin Voltage:  Frequency Hopping Function DRAIN Pin Voltage: 800 V (Max)  Burst Operation at Light Load VH Pin Voltage: 650 V (Max)  Frequency Reduction Function  Current at Switching Operation: 0.60 mA (Typ)  Built-in 650 V Startup Circuit  Current at Burst Operation: 0.35 mA (Typ)  Built-in 800 V Super Junction MOSFET  Maximum Switching Frequency: 100 kHz (Typ)  VCC UVLO (Under Voltage Lockout)  Operation Temperature Range:  VCC OVP (Over Voltage Protection)  MOSFET On Resistor:  Over Current Detection Function per Cycle  Over Current Detection Function AC Compensation Applications  Soft Start Function AC Adaptor, Various Household Applications (TV, Vacuum  External Latch Function Cleaner, Humidifier, Air Cleaner, Air Conditioner, IH Cooking Operation Power Supply Voltage Range 11.9 V to 25.5 V -40 °C to +105 °C 6.0 Ω (Typ) Heater and Rice Cooker, etc.) Pin Configuration Package W(Typ) x D(Typ) x H(Typ) 7 6 DRAIN GND LATCH 5 1 FB 3 DRAIN 4 VCC 2 DIP7K 9.27 mm x 6.35 mm x 8.63 mm VH (Note 1) Product structure: Silicon integrated circuit. This product has no designed protection against radioactive rays. (Note 2) Operating the IC over the absolute maximum ratings may damage the IC. and the internal circuitry. The damage can either be a short circuit between pins or an open circuit between pins Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings. Pin Description No. Pin Name I/O 1 VCC I Power supply input pin 2 FB I Feedback signal input pin 3 GND - GND pin 4 LATCH I External latch pin 5 VH I AC voltage startup pin © 2019 ROHM Co., Ltd. Function 6 DRAIN I/O MOSFET DRAIN pin 7 DRAIN I/O MOSFET DRAIN pin 4/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Design Overview 1 Key Parameters Parameter Symbol Min Typ Max Units V IN 90 230 264 V V OUT 4.75 5.00 5.25 V Output Current Range I OUT 0.0 0.5 0.5 A Maximum Switching Frequency f SW 94 100 106 kHz Over Current Detection Current I PEAK 0.192 - - A η - 65 - % Input Voltage Range Output Voltage (Note 1) Power Supply Efficiency (Note 1) The setting maximum output current I OUT_MAX is calculated by the formula below. 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂_𝑀𝑀𝑀𝑀𝑀𝑀 = 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂_𝑀𝑀𝑀𝑀𝑀𝑀 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂 𝜂𝜂 2 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂 0.5 × 1.1 = × 1.1 = 0.85 𝜂𝜂 0.65 Conditions At 10μs The value 1.1 indicates margin. [A] is the maximum output current. is the output current. is the power supply efficiency. Input Capacitor: C2 Select the value of the input capacitor with Table 1 as an indication. Table 1. Indication of Input Capacitor Selection Input Voltage (Vac) 85 to 264 180 to 264 C IN (µF) / PIN ( W ) 2 1 (Note 1) P IN : Input Power Example: When the output electricity P OUT = 2.5 W, 𝑃𝑃𝑂𝑂𝑂𝑂𝑂𝑂 2.5 ×2= × 2 = 7.7 𝜂𝜂 0.65 [μF] 𝑃𝑃𝑂𝑂𝑂𝑂𝑂𝑂 is the output power. 𝜂𝜂 is the power supply efficiency. Therefore, it is necessary for the input capacitor to be equivalent to 7.7 μF. © 2019 ROHM Co., Ltd. 5/33 A 10 μF capacitor is selected in this case. No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 2 Input Capacitor: C2 – continued It is necessary for C2’s withstand voltage to be the maximum input voltage or more. selected to it regarding the maximum value 264*√2 Vdc. The capacitor rated voltage is Btw 400 V rated capacitor should be sufficient The simulation circuit and result (the voltage wave form after smoothing) is shown in below. The AC input is 90 V / 50 Hz, C2 is 10 μF x 0.8 (including a permissible difference). Then the smoothing minimum voltage (V INDCMIN ) is 93 V. 125 120 Vdc / V 115 110 105 100 95 30 40 Time/mSecs Figure 5. Simulation Circuit Diagram 3 50 60 70 80 90 100 10mSecs/div Figure 6. Simulation Result Design of Transformer: T1 For design of the transformer, calculate like the following steps. 3.1 Decide on Transformer Current Slope Coefficient k Solve the transformer current slope coefficient k by the steps below. It is necessary for Duty to be set to 0.5 or less and for the transformer current slope coefficient k to be set to 1 or less. The duty cycle is set to 0.42 in this example. The primary voltage occurred from the secondary voltage of the transformer V OR is calculated by the formula below. 𝑉𝑉𝑂𝑂𝑂𝑂 = = 𝑉𝑉𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼 × 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 93 × 0.42 = 67.3 1 − 0.42 [V] 𝑉𝑉𝑂𝑂𝑂𝑂 is the primary voltage occurred from the secondary voltage of the transformer 𝑉𝑉𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼 is the smoothing minimum voltage. 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 is Duty cycle. © 2019 ROHM Co., Ltd. 6/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 3.1 Decide on Transformer Current Slope Coefficient k – continued Once V OR is calculated, the winding ratio N of the transformer is calculated. 𝑁𝑁 = 𝑁𝑁𝑃𝑃 𝑉𝑉𝑂𝑂𝑂𝑂 = 𝑁𝑁𝑆𝑆 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐹𝐹 = 67.3 = 11.6 5 + 0.8 𝑁𝑁 is the winding ratio of the transformer. 𝑁𝑁𝑃𝑃 is the number of primary winding turns. 𝑁𝑁𝑆𝑆 is the number of secondary winding turns. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑉𝑉𝐹𝐹 is the forward voltage of the secondary diode. Next, the secondary peak current I SP and primary peak current I PP is calculated by the formula below. Firstly, calculate them without the delay time of the built-in MOSFET (t DELAY1 ), do including t DELAY1 after calculating LP. 𝐼𝐼𝑆𝑆𝑆𝑆 = 𝐼𝐼𝑃𝑃𝑃𝑃 × 𝑁𝑁 𝐼𝐼𝑃𝑃𝑃𝑃 = 𝐼𝐼𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 + 𝐼𝐼𝑃𝑃𝑃𝑃 = 0.110 It is calculated as 𝐼𝐼𝑃𝑃𝑃𝑃 𝑉𝑉𝐼𝐼𝐼𝐼 𝐿𝐿𝑃𝑃 × 𝑡𝑡𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷1 [A] = 𝐼𝐼𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 . Therefore, 𝐼𝐼𝑆𝑆𝑆𝑆 = 0.192 × 11.6 = 2.23 [A] 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. 𝐼𝐼𝑃𝑃𝑃𝑃 is the primary peak current. N is the winding ratio of the transformer. 𝐼𝐼𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 is the over current detection current of BM2P26CK-Z. 𝐿𝐿𝑃𝑃 is the secondary inductance of the transformer. 𝑡𝑡𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷1 is the delay time of the built-in MOSFET. © 2019 ROHM Co., Ltd. 7/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 3.1 Decide on Transformer Current Slope Coefficient k – continued According to the above, the transformer current slope coefficient k is calculated by the formula below. 𝑘𝑘 = 2 − 𝑘𝑘 = 2 − 2 × 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂_𝑀𝑀𝑀𝑀𝑀𝑀 (1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷) × 𝐼𝐼𝑆𝑆𝑆𝑆 2 × 0.85 = 0.69 (1 − 0.42) × 2.23 𝑘𝑘 is the transformer current slope coefficient 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂_𝑀𝑀𝑀𝑀𝑀𝑀 is the setting maximum output current. 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 is the duty cycle. 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. In addition, it is possible to calculated ΔI S from the above. [A] 𝛥𝛥𝛥𝛥𝑆𝑆 = 𝐼𝐼𝑆𝑆𝑆𝑆 × 𝑘𝑘 = 2.23 × 0.69 = 1.54 𝛥𝛥𝛥𝛥𝑆𝑆 is the amount of change of the secondary current. 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. 𝑘𝑘 is the transformer current slope coefficient. (Note) The output current is calculated by the formula below because it is the average value of the transformer’s secondary current. 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂 = 0.5 × (𝐼𝐼𝑆𝑆𝑆𝑆 + 𝐼𝐼𝑆𝑆𝑆𝑆 ) × (1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷) 𝛥𝛥𝛥𝛥𝑆𝑆 = 𝐼𝐼𝑆𝑆𝑆𝑆 − 𝐼𝐼𝑆𝑆𝑆𝑆 𝐿𝐿𝑆𝑆 = therefore, 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐹𝐹 1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 × 𝛥𝛥𝐼𝐼𝑆𝑆 𝑓𝑓𝑆𝑆𝑆𝑆 𝑘𝑘 = ∆𝐼𝐼𝑆𝑆 𝐼𝐼𝑆𝑆𝑆𝑆 ISP ISB 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂 is the output current. IOUT 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary bottom current. 𝛥𝛥𝛥𝛥𝑆𝑆 is the amount of change of the secondary current. 𝑘𝑘 is the transformer current slope coefficient. 𝐿𝐿𝑆𝑆 is the secondary inductance of the transformer. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑉𝑉𝐹𝐹 is the forward voltage of the secondary diode. 𝑓𝑓𝑆𝑆𝑆𝑆 is the switching frequency. 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 is the duty cycle. © 2019 ROHM Co., Ltd. 8/33 1-Duty Figure 7. Secondary Current No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 3 Design of Transformer – continued 3.2 Calculating the Inductance L S and L P of the Transformer Firstly, calculate the secondary inductance L S of the transformer. 𝐿𝐿𝑆𝑆 = 𝐿𝐿𝑆𝑆 = (𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐹𝐹 ) (1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷) × ∆𝐼𝐼𝑆𝑆 𝑓𝑓𝑆𝑆𝑆𝑆_𝑀𝑀𝑀𝑀𝑀𝑀 (5 + 0.8) (1 − 0.42) × = 23.2 1.54 94 [μH] 𝐿𝐿𝑆𝑆 is the secondary inductance of the transformer. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑉𝑉𝐹𝐹 is the forward voltage of the secondary diode. 𝛥𝛥𝛥𝛥𝑆𝑆 is the amount of change of the secondary current. 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 is the duty cycle. 𝑓𝑓𝑆𝑆𝑆𝑆_𝑀𝑀𝑀𝑀𝑀𝑀 is the minimum switching frequency. Secondarily, calculate the primary inductance L P . 𝐿𝐿𝑃𝑃 = 𝐿𝐿𝑆𝑆 × 𝑁𝑁 2 = 23.2 × 11.62 = 3.13 [mH] 𝐿𝐿𝑃𝑃 is the primary inductance of the transformer. 𝐿𝐿𝑆𝑆 is the secondary inductance of the transformer. 𝑁𝑁 is the ratio of winding number of the transformer. BM2P26CK-Z has a built-in AC voltage compensation function and it compensates the over current detection current. The over current detection current I PP2 which corresponds to the delay time of the built-in MOSFET is calculated by the formula below. 𝐼𝐼𝑃𝑃𝑃𝑃2 = 𝐼𝐼𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 + 𝑉𝑉𝐷𝐷𝐷𝐷 × 𝑡𝑡𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷2 𝐿𝐿𝑃𝑃 𝐼𝐼𝑃𝑃𝑃𝑃2 is the over current detection current which corresponds to the delay time of a built-in MOSFET. 𝐼𝐼𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 is the secondary inductance of the transformer. 𝑉𝑉𝐷𝐷𝐷𝐷 is the ratio of winding number of the transformer. 𝐿𝐿𝑃𝑃 is the primary inductance of the transformer. 𝑡𝑡𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷2 is the delay time after the detection of over current. Because the minimum value of t DELAY2 is 200 ns, 𝐼𝐼𝑃𝑃𝑃𝑃2 = 0.192 + © 2019 ROHM Co., Ltd. 93 3.13 𝑚𝑚 × 200 𝑛𝑛 = 0.198 9/33 [A] No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 3.2 Calculating the Inductance L S and L P of the Transformer – continued Recalculate the below using the value I PEAK2 obtained in this section. 𝐼𝐼𝑆𝑆𝑆𝑆 = 𝐼𝐼𝑃𝑃𝑃𝑃2 × 𝑁𝑁 = 0.198 × 11.6 = 2.30 𝑘𝑘 = 2 − 2 × 0.85 = 0.72 (1 − 0.42) × 2.30 𝛥𝛥𝛥𝛥𝑆𝑆 = 𝐼𝐼𝑆𝑆𝑆𝑆 × 𝑘𝑘 = 2.30 × 0.72 = 1.65 [A] [A] 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. 𝐼𝐼𝑃𝑃𝑃𝑃2 is the over current detection current of BM2P26CK-Z which corresponds to the delay time of a built-in MOSFET. 𝑁𝑁 is the ratio of winding number of the transformer. 𝑘𝑘 is the transformer current slope coefficient. 𝛥𝛥𝛥𝛥𝑆𝑆 is the amount of change of the secondary current. Calculate the inductance values again. 𝐿𝐿𝑆𝑆 = 𝐿𝐿𝑆𝑆 = (𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐹𝐹 ) (1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷) × ∆𝐼𝐼𝑆𝑆 𝑓𝑓𝑆𝑆𝑆𝑆_𝑀𝑀𝑀𝑀𝑀𝑀 (5 + 0.8) (1 − 0.42) × = 21.6 1.65 94 𝐿𝐿𝑃𝑃 = 𝐿𝐿𝑆𝑆 × 𝑁𝑁 2 = 21.6 × 11.62 = 2.91 [μH] [mH] 𝐿𝐿𝑆𝑆 is the secondary inductance of the transformer. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑉𝑉𝐹𝐹 is the forward voltage of the secondary diode. 𝛥𝛥𝛥𝛥𝑆𝑆 is the amount of change of the secondary current. 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 is the duty cycle. 𝑓𝑓𝑆𝑆𝑆𝑆_𝑀𝑀𝑀𝑀𝑀𝑀 is the minimum switching frequency. 3.3 Decide on Transformer Size By Po(max) = 2.5 W, EE16 is selected for the core size of transformer because of large winging number. Table 2. Output Power and Transformer Core Output Power Po (W) Core Size Core’s Cross Section Ae (mm2) to 5 to 8 to 10 EI13/EE13 EI16/EE16 EI19/EE19 17.1 18.9 23.1 (Note) The above is reference value. © 2019 ROHM Co., Ltd. Confirm their detail to the manufacture. 10/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 3 Design of Transformer – continued 3.4 Calculating of Primary Winding Number N P Maximum magnetic flux density B (T) of general ferrite cores is 0.4 T at Ta = 100 °C. Thus, B SAT is set to 0.35 T and the core whose cross section Ae is 18.9 mm2 is selected. 𝐿𝐿𝑃𝑃 × 𝐼𝐼𝑃𝑃𝑃𝑃2 2810 𝜇𝜇𝜇𝜇 × 0.198 𝐴𝐴 𝑁𝑁𝑃𝑃 > = = 87.1 𝐴𝐴𝐴𝐴 × 𝐵𝐵𝑆𝑆𝑆𝑆𝑆𝑆 18.9 𝑚𝑚𝑚𝑚2 × 0.35 𝑇𝑇 [T] 𝑁𝑁𝑃𝑃 is the primary winding number of the transformer. 𝐿𝐿𝑃𝑃 is the primary inductance of the transformer. 𝐼𝐼𝑃𝑃𝑃𝑃2 is the over current detection current of BM2P26CK-Z which corresponds to the delay time of a built-in MOSFET. 𝐴𝐴𝑒𝑒 is the core’s cross section. 𝐵𝐵𝑆𝑆𝑆𝑆𝑆𝑆 is the effective saturation magnetic flux density. Therefore, the primary winding number N P is set to 88 turns or more. For this example, it is calculated in N P = 114 turns so that the wire is winded tightly from the bobbin size of the transformer. 3.4 Calculating of Secondary Winding Number N S The secondary winding number N S is calculated by the formula below. From 𝑁𝑁𝑃𝑃 𝑁𝑁𝑆𝑆 𝑁𝑁𝑆𝑆 = 𝑁𝑁𝑃𝑃 = 11.6 𝑁𝑁𝑆𝑆 , 114 = 9.8 ≒ 10 11.6 [T] is the primary winding number of the transformer. is the secondary winding number of the transformer. Therefore, N S is set to 10 turns. 𝑁𝑁 = So the ratio of the winding number is shown in below. 𝑁𝑁𝑃𝑃 114 = = 11.4 𝑁𝑁𝑆𝑆 10 𝑁𝑁 is the winging ratio of the transformer. 𝑁𝑁𝑆𝑆 is the number of secondary turns of the transformer. 𝑁𝑁𝑃𝑃 is the number of primary turns of the transformer. © 2019 ROHM Co., Ltd. 11/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 3 Design of Transformer – continued 3.6 Calculating of the VCC winding number N D When the VCC pin voltage V CC = 16 V and the forward voltage of the VCC pin diode V F_VCC = 1 V, the VCC winding number N D is calculated by the formula below. 𝑁𝑁𝐷𝐷 = 𝑁𝑁𝑆𝑆 × 𝑉𝑉𝐶𝐶𝐶𝐶 + 𝑉𝑉𝐹𝐹_𝑉𝑉𝑉𝑉𝑉𝑉 16 𝑉𝑉 + 1.0𝑉𝑉 = 10 𝑇𝑇 × = 29.3[T] 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐹𝐹 5.0 𝑉𝑉 + 0.8 𝑉𝑉 𝑁𝑁𝐷𝐷 is the VCC winding number. 𝑁𝑁𝑆𝑆 is the secondary winding number of the transformer. 𝑉𝑉𝐶𝐶𝐶𝐶 is the VCC pin voltage. 𝑉𝑉𝐹𝐹_𝑉𝑉𝑉𝑉𝑉𝑉 is the forward voltage of the VCC pin diode. 𝑉𝑉𝑂𝑂𝑂𝑂𝑇𝑇 is the output voltage. 𝑉𝑉𝐹𝐹 is the forward voltage of the secondary diode. According to above, N D is set to 30 turns. 3.7 And set the V CC to 15 V or more. Recalculation of the primary inductance value L P The all value it is necessary for the calculation of the primary inductance L P is obtained, and then recalculation by the steps below. 𝑉𝑉𝑂𝑂𝑂𝑂 = (𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐹𝐹 ) × 𝑁𝑁 = (5 + 0.8) × 11.4 = 66.1 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 = 𝑉𝑉𝑂𝑂𝑂𝑂 66.1 = = 0.42 𝑉𝑉𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐼𝐼𝐼𝐼 66.1 + 93 𝐼𝐼𝑃𝑃𝑃𝑃2 = 0.192 + 93 × 200 = 0.198 2.91 𝐼𝐼𝑆𝑆𝑆𝑆 = 𝐼𝐼𝑃𝑃𝑃𝑃2 × 𝑁𝑁 = 0.198 × 11.4 = 2.26 𝑘𝑘 = 2 − 2 × 0.85 = 0.73 (1 − 0.41) × 2.26 𝛥𝛥𝛥𝛥𝑆𝑆 = 𝐼𝐼𝑆𝑆𝑆𝑆 × 𝑘𝑘 = 2.26 × 0.73 = 1.65 𝐿𝐿𝑆𝑆 = [V] [A] [A] [A] (𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐹𝐹 ) (1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷) (5 + 0.8) (1 − 0.42) × = × = 22.1 ∆𝐼𝐼𝑆𝑆 𝑓𝑓𝑆𝑆𝑆𝑆_𝑀𝑀𝑀𝑀𝑀𝑀 1.65 94 𝐿𝐿𝑃𝑃 = 𝐿𝐿𝑆𝑆 × 𝑁𝑁 2 = 22.1 × 11.42 = 2.87 [μH] [mH] (Note) The description of each parameter is mentioned in the next page. © 2019 ROHM Co., Ltd. 12/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 3.7 Recalculation of the primary inductance value L P – continued 𝑉𝑉𝑂𝑂𝑂𝑂 is the primary voltage occurred from the secondary voltage of the transformer. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑉𝑉𝐹𝐹 is the forward voltage of the secondary diode. 𝑁𝑁 is the ratio of winding number of the transformer. 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 is the duty cycle. 𝑉𝑉𝐼𝐼𝐼𝐼 is the input voltage. 𝐼𝐼𝑃𝑃𝑃𝑃2 is the over current detection current of BM2P26CK-Z which corresponds to the delay time of a built-in MOSFET. 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. 𝑘𝑘 is the transformer current slope coefficient. 𝛥𝛥𝛥𝛥𝑆𝑆 is the amount of change of the secondary current. 𝐿𝐿𝑆𝑆 is the secondary inductance of the transformer. 𝑓𝑓𝑆𝑆𝑆𝑆_𝑀𝑀𝑀𝑀𝑀𝑀 is the minimum switching frequency. 𝐿𝐿𝑃𝑃 is the primary inductance of the transformer. According to the above, the specification of the transformer is determined like the below. Table 3. Specification of the Transformer (reference) Parameter Symbol Value Unit - EE16 (compatible) - Primary Inductance LP 2.87 mH Primary Winding Number NP 114 turns Secondary Winding Number NS 10 turns VCC Winding Number ND 30 turns Core © 2019 ROHM Co., Ltd. 13/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 3 Design of Transformer – continued 3.8 Design Sample of the Transformer Manufacture Alphatrans Co., Ltd. (1-7-2, Bakurou-cho, Chuo-ku, Osaka City, 541-0059, Japan) http//www.alphatrans.jp/ Product Name XE2373Y Bobbin 10PIN Core EE16  Primary Inductance 2.87 mH ± 10 % (100 kHz, 1 V)  Voltage Endurance Between Primary and Secondary AC1500 V Between Primary and Core AC1500 V Between Secondary and Core  Isolated Resistor AC500 V 100 MΩ or over (DC500 V) ●〇〇〇〇NP2〇〇〇〇 ●　〇　〇NS1〇〇　〇 ●　〇　〇Nd 〇〇　〇 ●　〇　〇NS1〇〇　〇 ●〇〇〇〇NP1〇〇〇〇 Figure 8. Circuit Diagram Figure 9. Structure Diagram Table 4. Product Specification of XE2373Y No. Transformer 1 2 Winding Pin Wire Turn Number Tape Layer Wire Specification 2 2UEW / Φ0.17 x 1 38 1 COMPACT 6 TEX / Φ0.32 x 2 10 1 COMPACT 2UEW / Φ0.17 x 1 30 1 COMPACT TEX / Φ0.32 x 1 10 1 COMPACT 2UEW / Φ0.17 x 1 76 2 COMPACT Start Finish NP1 3 NS1 9 3 ND 4 4 NS1 8 7 5 NP2 2 1 © 2019 ROHM Co., Ltd. 5 14/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Design Overview – continued 4 VCC Pin Diode: D3 A high-speed diode is recommended for the VCC pin diode. The reverse voltage V D1 applied to the VCC pin diode is calculated by the formula below. 𝑉𝑉𝐷𝐷1 = 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂_𝑀𝑀𝑀𝑀𝑀𝑀 + 𝑉𝑉𝐼𝐼𝐼𝐼_𝑀𝑀𝑀𝑀𝑀𝑀 × 𝑉𝑉𝐷𝐷1 = 29.0 + 374 × 𝑁𝑁𝐷𝐷 𝑁𝑁𝑃𝑃 30 = 127 114 [V] 𝑉𝑉𝐷𝐷1 is the reverse voltage applied to the VCC pin diode. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂_𝑀𝑀𝑀𝑀𝑀𝑀 is 29.0 V which is the maximum value of VCC OVP detection voltage of BM2P26CK-Z. 𝑉𝑉𝐼𝐼𝐼𝐼_𝑀𝑀𝑀𝑀𝑀𝑀 is the maximum value of the input voltage. 𝑁𝑁𝐷𝐷 is the VCC winding number. 𝑁𝑁𝑃𝑃 is the primary winding number of transformer. Considering the margin, 127 = 181 ≒ 200 0.7 [V] Therefore, a 200 V product is selected for the VCC pin diode D3. (Recommended item: RF05VAM2S (ROHM) 200 V / 0.5 A) 5 Resistor for Surge Voltage Restrictions for VCC Winding: R5 By the leakage inductance (L LEAK ) of the transformer, large surge voltage (spike noise) occurs at the moment the MOSFET turns on to off. The VCC pin voltage rises and VCC OVP in BM2P26CK-Z may be misdetected when the VCC winging evokes this surge voltage. To reduction the surge voltage evoked to the VCC winding, insert the resistor for restrictions (about 5 Ω to 22 Ω). It is necessary to confirm the state of the VCC pin voltage rising by implementing it in your product. The 5.6 Ω value is selected in this example. Figure 8. Circuit around BM2P26CK-Z © 2019 ROHM Co., Ltd. 15/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Design Overview – continued 6 VCC Pin Capacitor: C5 The value of the VCC pin capacitor C VCC is necessary to stabilize the VCC pin voltage in BM2P26CK-Z. The value 4.7 µF to 22 µF is recommended. The relation of the startup time and VCC pin capacitor is shown in Figure 9. A capacitor (10 µF / 35 V) is selected. Startup Time [s] 0.25 0.20 0.15 0.10 0.05 0.00 0 20 40 60 CVCC [μF] Figure 9. Startup Time (reference) 7 FB Pin Capacitor: C4 C4 is the capacitor for stability of the FB pin. (Recommend about 1000 pF to 0.01 μF) A capacitor (1000 pF) is selected. 8 RCD Snubber Circuit: C6, R7, R6, D4 By the leakage inductance (L LEAK ) of the transformer, large surge voltage occurs at the moment the MOSFET turns on to off. In worst case, the MOSFET may be destroyed because this surge voltage is applied to the between DRAIN and SOURCE of MOSFET. (Recommended Value) To restrict it, it is recommended to insert the RCD snubber circuit. C6: 2200 pF R7: 100 kΩ R6: 10 Ω D4: 800 V / 0.2 A Use a fast recovery diode for the diode D4. The voltage endurance is necessary to be Vds of MOSFET (Max) or more. (Recommended item: RFU02VSM8S (ROHM) 800 V / 0.2 A) Figure 10. MOSFET DRAIN Voltage Wave Form © 2019 ROHM Co., Ltd. 16/33 Figure 11. Snubber Circuit No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Design Overview – continued 9 Output Rectification Diode: D5 Use a high-speed diode (schottky barrier diode or fast recovery diode) for the output rectification diode. When the output voltage V OUT is set to 5.25 V, the reverse voltage V D2 applied to the output rectification diode is calculated by the formula below. 𝑉𝑉𝐷𝐷2 = 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 + 𝑉𝑉𝐼𝐼𝐼𝐼_𝑀𝑀𝑀𝑀𝑀𝑀 × 𝑉𝑉𝐷𝐷2 = 5.25 + 374 × 𝑁𝑁𝑆𝑆 𝑁𝑁𝑃𝑃 30 = 38.5 114 [V] 𝑉𝑉𝐷𝐷2 is the reverse voltage applied to the output rectification diode. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑉𝑉𝐼𝐼𝐼𝐼_𝑀𝑀𝑀𝑀𝑀𝑀 is the maximum input voltage. 𝑁𝑁𝑆𝑆 is the secondary winding number of the transformer. 𝑁𝑁𝑃𝑃 is the primary winding number of the transformer. Considering the margin, 38.5 = 55 ≒ 60 0.7 [V] And the current I S (rms) flowing to the output diode is calculated by the formula below. 𝐼𝐼𝑆𝑆(𝑟𝑟𝑟𝑟𝑟𝑟) = 𝐼𝐼𝑆𝑆𝑆𝑆 × � 1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 1 − 0.42 = 2.26 × � = 0.99 3 3 [A] 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 is the duty cycle. A diode (3 A / 60 V) is selected in this evaluation board. It is recommended to be set the voltage margin to 80 % or less and the current margin to 50 % or less. (Recommended item: RB058LAM-60 (ROHM) 60 V / 3.0 A) © 2019 ROHM Co., Ltd. 17/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Design Overview – continued 10 Output Capacitor: C9 The output capacitor is determined by the peak to peak ripple voltage (ΔV PP ) and ripple current which are acceptable at the maximum load current value. At the MOSFET on, the output diode is off. Then the current is supplied to the load current from the output capacitor. At the MOSFET off, the diode becomes on, and the current supplied to both of the output capacitor and the load current. The secondary peak current I SP is calculated from the rating output current. 𝐼𝐼𝑆𝑆𝑆𝑆 = 𝐼𝐼𝑆𝑆𝑆𝑆 = 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂 ∆𝐼𝐼𝑆𝑆 + 1 − 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 2 0.5 1.48 + = 1.60 1 − 0.42 2 [A] 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂 is the output current. 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 is the duty cycle. ∆𝐼𝐼𝑆𝑆 is the amount of change of the secondary current. At V IN = 100 V, P OUT = 2.5 W, the impedance Z C of the output capacitor is calculated by the formula below when the ΔV PP is set to be 0.15 V. 𝑍𝑍𝐶𝐶 < ∆𝑉𝑉𝑃𝑃𝑃𝑃 0.15 = = 0.094 𝐼𝐼𝑆𝑆𝑆𝑆 1.6 [Ω] 𝑍𝑍𝐶𝐶 is the impedance of the output capacitor. ∆𝑉𝑉𝑃𝑃𝑃𝑃 is the output ripple voltage. 𝐼𝐼𝑆𝑆𝑆𝑆 is the secondary peak current. And the ripple current I C (rms) to the capacitor is calculated by the formula below. 𝐼𝐼𝐶𝐶(𝑟𝑟𝑟𝑟𝑟𝑟) = �𝐼𝐼𝐶𝐶(𝑟𝑟𝑟𝑟𝑟𝑟) 2 − 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂 2 = �0.732 − 0.52 = 0.53 [A] 𝐼𝐼𝐶𝐶(𝑟𝑟𝑟𝑟𝑟𝑟) is the root mean square value of the ripple current to the capacitor. 𝐼𝐼𝑂𝑂𝑂𝑂𝑂𝑂 is the output current. © 2019 ROHM Co., Ltd. 18/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 10 Output Capacitor: C9 – continued Because the voltage endurance of the capacitor is determined by referring to 80 % of the derating corresponding to the output voltage. 5 = 6.3 0.8 [V] Therefore, the voltage rating is set to be 10 V. On this evaluation board, the low impedance type for the switching power supply is used. (Recommend item: 860 040 75 008 (WURTH) 25 V, 470 µF, Rating ripple current: 1.2 A, Impedance: 68 mΩ (Max)) It is necessary to confirm the actual ripple voltage and current on the actual machines.) Figure 12. Circuit around Output 11 Setting Resistor of Output Voltage V OUT : R9, R10, R11 The output voltage V OUT is calculated by the formula below. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 = �1 + 𝑅𝑅9 + 𝑅𝑅10 � × 𝑉𝑉𝑅𝑅𝑅𝑅𝑅𝑅 𝑅𝑅11 First, decide the value of R11. In this evaluation board, a resistor 5.6 kΩ is selected. The combined resistance (R9 + R10) of the feedback resistor is calculated by the formula below. 𝑅𝑅9 + 𝑅𝑅10 = 𝑅𝑅11 × �1 + 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 5 � = 5.6 × �1 + � = 5.6 𝑉𝑉𝑅𝑅𝑅𝑅𝑅𝑅 2.495 [kΩ] 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑅𝑅9 is the resistance value of R9. 𝑅𝑅10 is the resistance value of R10. 𝑅𝑅11 is the resistance value of R11. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑉𝑉𝑅𝑅𝑅𝑅𝑅𝑅 is the reference voltage of the shunt regulator. (2.495 V) Therefore, the value below is recommended. (Recommended value) © 2019 ROHM Co., Ltd. R9: 0 Ω R10: 5.6 kΩ 19/33 R11: 5.6 kΩ No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Design Overview – continued 12 Design of the Feedback Circuit: R12, R14, R15, C12 R15 is the setting resistor of the dark current of the shunt regulator. From its specifications, the current I MIN which makes its operation stable is 1.0 mA. The current is supplied from R15. The voltage applied to R15 is the value that is took the cathode voltage V KA of the shunt regulator from the output voltage. 𝑅𝑅14 < 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 − 𝑉𝑉𝐾𝐾𝐾𝐾 5 − 2.495 = 𝐼𝐼𝑀𝑀𝑀𝑀𝑀𝑀 1 [kΩ] 𝑅𝑅14 is the resistance value of R14. 𝑉𝑉𝑂𝑂𝑂𝑂𝑂𝑂 is the output voltage. 𝑉𝑉𝐾𝐾𝐾𝐾 is the cathode voltage of the shunt regulator. 𝐼𝐼𝑀𝑀𝑀𝑀𝑀𝑀 is the current which makes shunt regulator’s operation stable (Recommended Value) R15 (Setting resistor of the dark current) 2.2 kΩ R12 (Current limiting Resistor of the feedback circuit) 300 Ω to 2.2 kΩ R14 (Phase Compensation Circuit) 2.7 kΩ C16(Phase Compensation Circuit) 0.22 μF Figure 13. Feedback Circuit © 2019 ROHM Co., Ltd. 20/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Design Overview – continued 13 EMI Measures For the EMI measures, a filter (FL1) and X Capacitor (C1) is connected to the input part. A common mode filter is used for FL1 and the capacitor whose value is up to 6.8 μF can be connected to C1. (Note) The constants is reference value. Design it considering the effect of noise. Figure 14. Input Filter Circuit 13.1 Discharge Circuit of X Capacitor: D1, D2, R4 When the input voltage runs out, the charge stored in X Capacitor is discharged via D1, D2 and R4. (Recommended item: D1 and D2: 1N4001 R4: 100 Ω) 13.2 Capacitor between Primary and Secondary Side: C7 Use the Y capacitor which is about 2200 pF for C7. 13.3 RC Snubber Circuit: C8, R8 For the emission measures, RC snubber circuit is added to the secondary rectification diode. Use the 1000 pF capacitor for C8 and 10 Ω resistor for R8. Figure 15. RC Snubber Circuit of secondary rectification diode. © 2019 ROHM Co., Ltd. 21/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Measurement DATA Load Regulation 100 5.25 5.15 90V Efficiency [%] Output Voltage: VOUT [V] 1 115 V 5.05 132 V 4.95 176 V 4.85 230 V 0.2 0.3 0.4 115 V 40 132 V 20 176 V 230 V 4.75 0.1 90V 60 0 264 V 0.0 80 0 0.5 0.1 0.2 0.3 0.4 0.5 264 V Output Current [A] Output Current: IOUT [A] Figure 16. Load Regulation (V OUT vs I OUT ) Figure 17. Load Regulation (Efficiency vs I OUT ) Table 5. Load Regulation (V IN =115 Vac) Table 6. Load Regulation (V IN =230 Vac) I OUT [A] V OUT [V] Efficiency [%] I OUT [A] V OUT [V] Efficiency [%] 0.01 4.981 48.83 0.01 4.981 45.28 0.02 4.981 57.92 0.02 4.981 55.34 0.05 4.981 65.54 0.05 4.981 62.26 0.07 4.981 68.23 0.07 4.981 65.79 0.1 4.981 70.35 0.1 4.981 67.31 0.2 4.980 73.13 0.2 4.980 70.64 0.5 4.980 78.01 0.5 4.980 71.14 © 2019 ROHM Co., Ltd. 22/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Measurement DATA – continued 5.25 5.20 5.15 5.10 5.05 5.00 4.95 4.90 4.85 4.80 4.75 IOUT 0.0 A 0.2 A 0.5 A 90 140 190 240 Efficiency [%] Line Regulation VOUT [V] 2 100 90 80 70 60 50 40 30 20 10 0 IOUT 0.01 A 0.2 A 0.5 A 90 VIN [V] 190 240 VIN (V) Figure 18. Line Regulation (V OUT vs V IN ) Figure 19. Line Regulation (Efficiency vs V IN ) Table 7. Line Regulation Table 8. Efficiency Regulation I OUT (A) V IN [Vac] 140 I OUT (A) V IN [Vac] 0.0 0.2 0.5 90 4.980 4.980 4.980 0.0 0.2 0.5 90 49.80 75.00 76.15 115 4.981 4.980 4.980 115 48.83 73.13 78.01 132 4.980 4.980 4.980 132 45.69 72.59 76.66 176 4.981 4.981 4.980 176 47.44 71.26 75.41 230 4.981 4.980 4.980 230 45.28 70.64 71.14 264 4.980 4.981 4.980 264 45.28 70.15 72.38 © 2019 ROHM Co., Ltd. 23/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Measurement DATA – continued Switching Frequency Switching Frequecy [kHz] 3 100 90 80 70 60 50 40 30 20 10 0 115 V 230 V 0 0.1 0.2 0.3 0.4 0.5 IOUT [A] Figure 20. Switching Frequency vs I OUT Table 9. Measurement Result of Switching Frequency V IN (V) I OUT [A] © 2019 ROHM Co., Ltd. 115 230 0 0.28 0.27 0.001 0.42 0.40 0.002 0.56 0.50 0.005 1.00 0.89 0.007 1.29 1.12 0.01 1.67 1.49 0.02 2.94 2.79 0.05 6.36 6.25 0.07 8.72 8.62 0.1 8.23 11.76 0.2 45.40 23.58 0.5 100.00 60.97 24/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Measurement DATA – continued 4 Switching Wave Form MOSFET VDS MOSFET VDS 100 V / Div 100 V / Div Drain Current ID Figure 21. MOSFET Wave Form V IN = 90 Vac, I OUT = 0. 5 A Secondary Diode Voltage VD 0.2 A / Div Drain Current ID 0.2 A / Div Figure 22. MOSFET Wave Form V IN = 264 Vac, I OUT = 0.5 A Secondary Diode Voltage VD 10 V / Div 20 V / Div Secondary Diode Current IS Secondary Diode Current IS 1.0 A / Div Figure 23. Diode Wave Form V IN = 90 Vac, I OUT = 0.5 A © 2019 ROHM Co., Ltd. 25/33 1.0 A / Div Figure 24. Diode Wave Form V IN = 264 Vac, I OUT = 0.5 A No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 4 Switching Wave Form – continued MOSFET VDS MOSFET VDS 20 V / Div Drain Current ID 5 A / Div Figure 25. MOSFET Wave Form V IN = 90 Vac 1 A / Div Drain Current ID Figure 26.Diode Wave Form V IN = 264 Vac Output Shorted 5 100 V / Div Output Shorted Startup Wave Form Input Voltage VIN Input Voltage VIN 250 V / Div 100 V / Div 2 V / Div 2 V / Div Output Voltage VOUT Output Voltage VOUT Figure 27. V IN = 90 Vac, I OUT = 0.5 A © 2019 ROHM Co., Ltd. Figure 28. V IN = 264 Vac, I OUT = 0.5 A 26/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Measurement DATA – continued 6 Dynamic Load Fluctuation Output Ripple Voltage VRIPPLE Output Ripple Voltage VRIPPLE 50 mV / Div 50 mV / Div Output Current IOUT Output Current IOUT 0.5 A / Div Figure 29. V IN = 115 Vac, I OUT = switch 0 A /0.5 A 7 0.5 A / Div Figure 30. V IN = 230 Vac, I OUT = switch 0 A / 0.5 A Output Voltage Ripple Wave Form 50 mV / Div 50 mV / Div Output Ripple Voltage VRIPPLE Output Ripple Voltage VRIPPLE = 42 mVpp = 44 mVpp Figure 31. V IN = 115 Vac, I OUT = 0.5 A 8 Figure 32. V IN = 230 Vac, I OUT = 0.5 A Temperature of Parts Surface They are measured after 15 minutes from applying a power supply. Table 10. Surface Temperature of Parts (Ta = 27 °C) Part BM2P26CK-Z Diode © 2019 ROHM Co., Ltd. Condition V IN = 90 Vac, I OUT = 0.5 A V IN = 264 Vac, I OUT = 0.5 A 47.6 °C 50.5 °C 27/33 57.8 °C 54.0 °C No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Measurement DATA – continued 9 EMI 9.1 Noise Pin Voltage QP margin: AVE margin: 17.3 dB 18.5 dB QP margin: AVE margin: 10.9 dB 5.5 dB Figure 33. V IN 115 Vac / 60 Hz, I OUT 0.5 A Figure 34. V IN 230 Vac / 50 Hz, I OUT 0.5 A © 2019 ROHM Co., Ltd. 28/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 9 EMI – continued 9.2 Electric Field Strength (3 m Method) QP margin: 10.2 dB QP margin: 11.3 dB Figure 35. V IN 115 Vac / 60 Hz, I OUT 0.5 A Figure 36. V IN 230 Vac / 50 Hz, I OUT 0.5 A © 2019 ROHM Co., Ltd. 29/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Circuit Diagram (Condition) V IN = 90 Vac to 264 Vac, V OUT = 5 V Figure 37. Circuit Diagram of BM2P26CK-EVK-001 © 2019 ROHM Co., Ltd. 30/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Bill of Materials Capacitor Diode Diode - Bridge Fuse IC Opto-coupler Item Spec C1 0.47uF/310V 890 334 025 039 CS WURTH C2 10uF/450V 450BXC10MFC 10×20 Rubycon Parts name Maker C3 - - - C4 1000pF/100V GRM2165C2A102J Murata C5 10uF/35V GMK316AB7106KL-TR Murata C6 2.2nF/1kV GRM31BR73A222KW01L Murata C7 2200pF/250V DE1E3RA222MJ4BQ01F Murata C8 1000pF/100V GRM2165C2A102J Murata C9 470uF/25V 860 040 75 008 WURTH C10 - C11 0.1uF/100V HMK107B7104MA-T Taiyou Yuden C12 0.22uF/16V EMK107B7224KAHT Taiyou Yuden C13 - - - D1 1kV 1A 1N4007 D2 1kV 1A 1N4007 D3 0.5A/200V RF05VSM2S ROHM D4 0.2A / 800 V RFU02VSM8S ROHM D5 3A/60V RB058LAM-60 ROHM DB1 1A/800V D1UBA80-7062 SHINDENGEN F1 1A/300V 36911000000 Littelfuse IC1 BM2P26CK ROHM IC2 TL431BIDBZT TI PC1 LTV-817-B LiteOn CommonMode-Coil LF1 UF9.8V-20 ALPHA TRANS Connector CN1 B02P-NV(LF)(SN) JST Varistor ZNR1 470V V470ZA05P Littelfuse R4 100 KTR18PZPZJ101 ROHM R5 5.6 MCR18PZPZJ５R6 ROHM R6 10 MCR18EZPJ100 ROHM R7 100k MCR25JZHJ104 ROHM R8 10 MCR18EZPJ100 ROHM R9 0 MCR03PZPZJ000 ROHM R10 5.6k MCR03EZPFX5601 ROHM R11 5.6k MCR03EZPFX5601 ROHM R12 1k MCR03PZPZJ102 ROHM Resistor Transfomer © 2019 ROHM Co., Ltd. R13 - - R14 2.7k MCR03PZPZJ272 ROHM R15 2.2k MCR03PZPZJ222 ROHM T1 3.49mH TT0092 ALPHA TRANS 31/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Layout Size 55 mm x 90 mm Figure 38. TOP Silk Screen (Top view) Figure 39. Bottom Layout (Top View) © 2019 ROHM Co., Ltd. 32/33 No. 62UG052E Rev.001 2019.10 User’s Guide BM2P26CK-EVK-001 Revision History Date Rev. 10.Oct.2019 001 © 2019 ROHM Co., Ltd. Changes New Release 33/33 No. 62UG052E Rev.001 2019.10 Notice Notes 1) The information contained herein is subject to change without notice. 2) Before you use our Products, please contact our sales representative and verify the latest specifications : 3) Although ROHM is continuously working to improve product reliability and quality, semiconductors can break down and malfunction due to various factors. Therefore, in order to prevent personal injury or fire arising from failure, please take safety measures such as complying with the derating characteristics, implementing redundant and fire prevention designs, and utilizing backups and fail-safe procedures. ROHM shall have no responsibility for any damages arising out of the use of our Poducts beyond the rating specified by ROHM. 4) Examples of application circuits, circuit constants and any other information contained herein are provided only to illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. 5) The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM or any other parties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use of such technical information. 6) The Products specified in this document are not designed to be radiation tolerant. 7) For use of our Products in applications requiring a high degree of reliability (as exemplified below), please contact and consult with a ROHM representative : transportation equipment (i.e. cars, ships, trains), primary communication equipment, traffic lights, fire/crime prevention, safety equipment, medical systems, servers, solar cells, and power transmission systems. 8) Do not use our Products in applications requiring extremely high reliability, such as aerospace equipment, nuclear power control systems, and submarine repeaters. 9) ROHM shall have no responsibility for any damages or injury arising from non-compliance with the recommended usage conditions and specifications contained herein. 10) ROHM has used reasonable care to ensurH the accuracy of the information contained in this document. However, ROHM does not warrants that such information is error-free, and ROHM shall have no responsibility for any damages arising from any inaccuracy or misprint of such information. 11) Please use the Products in accordance with any applicable environmental laws and regulations, such as the RoHS Directive. For more details, including RoHS compatibility, please contact a ROHM sales office. ROHM shall have no responsibility for any damages or losses resulting non-compliance with any applicable laws or regulations. 12) When providing our Products and technologies contained in this document to other countries, you must abide by the procedures and provisions stipulated in all applicable export laws and regulations, including without limitation the US Export Administration Regulations and the Foreign Exchange and Foreign Trade Act. 13) This document, in part or in whole, may not be reprinted or reproduced without prior consent of ROHM. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ ZZZURKPFRP ‹652+0&R/WG$OOULJKWVUHVHUYHG 5%