●SI-8400L/8500L Series SI-8400L/8500L Series Separate Excitation Switching Type with Coil ■Features • • • • • • Integrated switching IC and coil construction Requires 2 external components only Low switching noise Heatsink not required Built-in overcurrent and thermal protection circuits Built-in soft start circuit (Output ON/OFF control)...SI-8500L Series ■Applications • Telephone power supplies • Onboard local power supplies ■Lineup Part Number SI-8401L SI-8402L SI-8403L SI-8405L SI-8501L SI-8502L SI-8503L SI-8504L SI-8505L VO(V) 5.0 12.0 3.3 15.0 5.0 12.0 3.3 9.0 15.0 IO(A) 0.5 0.4 0.5 0.4 1.0 ■Absolute Maximum Ratings Parameter Ratings Symbol Unit SI-8400L SI-8500L DC Input Voltage VIN Power Dissipation PD 35 V Junction Temperature Tj +100 °C Storage Temperature Tstg –25 to +85 °C 1.25 3 W ■Recommended Operating Conditions Parameter Ratings Symbol Unit SI-8401L SI-8402L SI-8403L SI-8405L VIN 7 to 33 15 to 33 5.3 to 33 18 to 33 Output Current Range IO 0 to 0.5 0 to 0.4 0 to 0.5 0 to 0.4 Operating Temperature Range Top DC Input Voltage Range Parameter DC Input Voltage Range VIN A °C –20 to +85 Ratings Symbol V Unit SI-8501L SI-8502L SI-8503L SI-8504L SI-8505L 7 to 33 15 to 33 5.3 to 33 12 to 33 18 to 33 V Output Current Range IO 0 to 1.0 A Operating Temperature Range Top –20 to +85 °C 96 ●SI-8400L/8500L Series ■Electrical Characteristics (Ta=25°C) Ratings Parameter Output Voltage Symbol VO SI-8401L typ. max. min. typ. max. min. typ. max. 4.80 5.00 5.20 11.40 12.00 12.60 3.17 3.30 3.43 14.25 15.00 15.75 VIN=20V, IO=0.3A η Load Regulation Temperature Coefficient of Output Voltage Switching Ripple Voltage (C2=470µF) Overcurrent Protection Starting Current VIN=15V, IO=0.3A 88 75 89 VIN=24V, IO=0.3A VIN=15V, IO=0.3A VIN=27V, IO=0.3A % 60 60 60 60 VIN=20V, IO=0.3A VIN=24V, IO=0.3A VIN=15V, IO=0.3A VIN=27V, IO=0.3A 80 100 100 130 60 80 kHZ 100 130 VIN=10 to 30V, IO=0.3A VIN=18 to 30V, IO=0.3A VIN=8 to 30V, IO=0.3A VIN=21 to 30V, IO=0.3A 30 70 20 90 ∆VOLOAD 40 95 30 VIN=24V, IO=0.1 to 0.4A VIN=15V, IO=0.1 to 0.4A VIN=27V, IO=0.1 to 0.4A ∆VO/∆Ta ±0.5 ±1.5 ±0.5 ±1.5 ∆Vr 20 Conditions IS1 35 VIN=20V, IO=0.3A 15 VIN=24V, IO=0.3A 0.55 Conditions 70 40 VIN=15V, IO=0.3A 0.45 VIN=10V 30 0.55 VIN=18V mV 120 VIN=20V, IO=0.1 to 0.4A 40 V VIN=27V, IO=0.3A 80 ∆VOLINE Conditions VIN=24V, IO=0.3A VIN=20V, IO=0.3A f Conditions Unit min. Conditions Line Regulation SI-8405L max. Conditions Switching Frequency SI-8403L typ. Conditions Efficiency SI-8402L min. mV mV/°C 80 mVp-p VIN=27V, IO=0.3A 0.45 VIN=8V A VIN=21V (Ta=25°C) Ratings Parameter Output Voltage Symbol VO Conditions Efficiency Line Regulation Switching Ripple Voltage (C2=470µF) Overcurrent Protection Starting Current 5.20 VIN=20V, IO=0.5A SI-8503L typ. max. min. 11.40 12.00 12.60 VIN=24V, IO=0.5A 3.17 SI-8504L SI-8505L typ. max. min. typ. max. min. 3.30 9.00 3.43 VIN=15V, IO=0.5A 8.55 9.45 VIN=21V, IO=0.5A Unit typ. max. 14.25 15.00 15.75 83 89 79 87 90 VIN=24V, IO=0.5A VIN=15V, IO=0.5A VIN=21V, IO=0.5A VIN=25V, IO=0.5A 60 60 60 60 60 VIN=20V, IO=0.5A VIN=24V, IO=0.5A VIN=15V, IO=0.5A VIN=21V, IO=0.5A VIN=25V, IO=0.5A 70 130 VIN=10 to 30V, IO=0.5A 30 70 130 VIN=18 to 30V, IO=0.5A 55 30 50 80 VIN=8 to 30V, IO=0.5A 55 20 70 130 VIN=15 to 30V, IO=0.5A 45 30 70 % kHZ 130 55 30 55 VIN=24V, IO=0.2 to 0.8A VIN=15V, IO=0.2 to 0.8A VIN=21V, IO=0.2 to 0.8A VIN=25V, IO=0.2 to 0.8A ∆VO/∆Ta ±0.5 ±1.5 ±0.5 ±1.0 ±1.5 ∆Vr 45 30 15 25 30 VIN=20V, IO=0.5A VIN=24V, IO=0.5A VIN=15V, IO=0.5A VIN=21V, IO=0.5A VIN=25V, IO=0.5A 1.1 1.1 1.1 1.1 IS1 Conditions VIN=18V VIN=24V VIN=12V 1.1 VIN=21V mV VIN=21 to 30V, IO=0.5A VIN=20V, IO=0.2 to 0.8A Conditions V VIN=25V, IO=0.5A VIN=20V, IO=0.5A ∆VOLOAD Conditions Temperature Coefficient of Output Voltage 5.00 ∆VOLINE Conditions Load Regulation typ. max. min. 4.80 f Conditions SI-8502L min. η Conditions Switching Frequency SI-8501L mV mV/°C mVp-p A VIN=25V 97 ●SI-8400L/8500L Series ■Outline Drawing (unit:mm) SI-8400L SI-8500L VIN y LIN r e LIN b w GND 14.5±0.5 b a a. Part Number b. Lot Number Open Air Type Weight: Approx. 14.5g 26±0.1 12 a Vo q a. Part Number b. Lot Number Open Air Type Weight: Approx. 5.1g ±0.5 VIN r SK Terminal 1 marking 13.2 (7.62) (2.19) 18 (10.16) 3.7 ±0.6 4.7 φ 0.8max. (2.17) Terminal 1 marking ,,,,,, ,,,, ,,,, ,,, 10 ±0.2 ±0.6 q w e VOUT SS GND ±0.1 26 φ 0.6 4 2 18 ■Block Diagram SI-8400L SI-8500L 3 4 LIN 4 L1 MIC1 VIN Reg. OSC 1 6 VO VIN OCP OSC Reset Comp. TSD Latch & Drive TSD Di1 Di1 Amp. Amp. VREF VREF 2 2 GND S.S. 3 GND ■Standard External Circuit VIN 4 + C1 220µF VIN SI-8400L GND 2 GND Pin compatible with SI-8200L 98 VOUT LIN 3 N.C VO 1 + VIN 6 + C1 470µF C2 470µF GND GND 1 VO Reg. Latch & Drive Comp. L1 MIC1 OCP Reset LIN VIN S.S 2 C3 SI-8500L VOUT GND LIN 3 4 VO 1 + C2 470µF N.C GND C3 is necessary only for using soft start function. Pin compatible with SI-8300L ●SI-8400L/8500L Series ■Ta-PD Characteristics 3.0 1.5 1.0 0.5 0 0 25 50 75 Ambient Temperature Ta (°C) PD=VO•IO SI-8500L Power Dissipation PD (W) Power Dissipation PD (W) SI-8400L 100 VO :Output voltage IO :Output current ηχ :Efficiency (%) 2.0 1.0 0 0 100 –1 ηχ 25 50 75 Ambient Temperature Ta (°C) 100 The efficiency depends on the input voltage and the output current. Thus, obtain the value from the efficiency graph and substitute the percentage in the formula above. ■SI-8500L application circuit Terminal no.2 is for soft start. Connecting a capacitor to the terminal enables the soft start function. See page 85 for the formulas to calculate delay time and rise time. Output can be turned on and off by using the soft start terminal. To stop output, set the soft start terminal voltage to VSSL (0.2V typ.) or less. To switch the potential of the soft start terminal, drive the open collector of the transistor. Since the discharge current from C3 flows to the ON/OFF control transistor, limit the current for protection. The SS terminal is pulled up to the power supply in the IC and no external voltage can be applied. SI-8500L SI-8500L SI-8500L 2 S.S. 2 S.S. 2 S.S. C3 VO. ON/OFF Soft start C3 Soft start +VO ON/OFF ■Caution 1. Allocation of Components For the best operating environment, the ground should be a single ground line at the GND terminal (terminal 2 on the SI-8400L, terminal 3 on the SI-8500L), and the wiring from C1 and C2 to ground should be as short as possible. 2. Capacitors C1 and C2 1) They must satisfy the breakdown voltage and allowable ripple current. Exceeding the ratings of these capacitors or using them without derating shortens their service lives and may also cause abnormal oscillation of the IC. 2) C2 must be a low-impedance type capacitor to ensure minimum ripple voltage and stable switching operation. 3) C3 (SI-8500L only) is a capacitor for soft start. When not using soft start, leave terminal 2 open. It is pulled up inside the IC. 3. Terminals LIN and NC in the connection diagram must be left unconnected to other circuits. 4. The IC's metalic heatsink is electrically floating. Do not connect it to GND or any other circuit. 5. Since the SI-8400L and 8500L series have an open-package construction, they can only be operated in specific environments. Verify the operating environment and use the conditions indicated in the reliability data. 99 ●SI-8400L/8500L Series ■Typical Characteristics (SI-8400L Series) Rise Characteristics(SI-8401L) Efficiency Characteristics(SI-8401L) Ta=25°C 6 100 5.2 Efficiency η (%) A A 0.5 =0 IO 3 0.3A 2 20V 25V 33V 10V 7V 80 70 VIN 7V 10V 20V 60 25V 33V Output Voltage VO (V) 0.1A 4 Ta=25°C 5.3 90 5 Output Voltage VO (V) Load Regulation(SI-8401L) Ta=25°C 5.1 20V VIN=33V 5.0 10V 7V 4.9 4.8 1 50 4 6 8 0 0 10 0.1 Temperature Characteristics(SI-8401L) 0.4 0 0 0.5 70 5.1 5.0 VO 60 4.9 f 50 4.8 40 4.7 –20 0 20 40 60 80 4 3 2 0.5 VIN=20V, IO=20mA 4 3 2 1 0 0 100 0 0.4 5 1 0 –40 0.3 6 20V 5 0.2 Thermal Protection Characteristics(SI-8401L) V 80 5.2 =7 η 0.1 Output Current IO (A) Ta=25°C VIN 90 6 Output Voltage VO (V) Efficiency η (%) Frequency f (kHz) 0.3 Overcurrent Protection Characteristics(SI-8401L) 5.3 Output Voltage VO (V) VIN=20V, IO=0.3A 100 0.2 Output Current IO (A) Input Voltage VIN (V) Output Voltage VO (V) 2 V 0 33 0 0.5 1.0 1.5 0 2.0 0 Output Current IO (A) Ambient Temperature Ta (°C) 50 100 150 200 Case Temperature TC (°C) Note on Thermal Protection: The thermal protection circuit is intended for protection against heat during instantaneous shortcircuiting. Its operation is not guaranteed for shortcircuiting over extended periods of time. Rise Characteristics(SI-8402L) Efficiency Characteristics(SI-8402L) Ta=25°C 14 4 70 60 5 10 15 Input Voltage VIN (V) 20 0 0 12.1 VIN=33V 24V 12.0 20V 15V 11.9 11.8 50 2 100 80 Output Voltage VO (V) 6 0 0 12.2 33 24 VI V V N= 15 V Efficiency η (%) 8 4A I O= 0A 10 Ta=25°C 12.3 90 0.2A 0. Output Voltage VO (V) 12 Load Regulation(SI-8402L) Ta=25°C 100 0.1 0.2 0.3 Output Current IO (A) 0.4 0 0 0.1 0.2 0.3 Output Current IO (A) 0.4 ●SI-8400L/8500L Series ■Typical Characteristics (SI-8500L Series) Rise Characteristics(SI-8501L) Efficiency Characteristics(SI-8501L) Ta=25°C 7 100 3 80 60 50 1 40 0 5 10 15 20V V 33 70 2 0 Output Voltage VO (V) 0.5A VIN= 0 20 7 5.10 6 0.25 0 5.00 70 VO f 4.95 50 4.90 40 4.85 0 40 0.75 0 0 1 0.5 0.75 1 Thermal Protection Characteristics(SI-8401L) Ta=25°C VIN=20V, IO=0A 7 6 5 4 3 20V 2 5 4 3 2 1 1 0 120 80 0.25 Output Current IO (A) 33V 5.05 80 0 –40 0.5 VIN=7V η Output Voltage VO (V) 90 5.15 15V 7V 4.90 Overcurrent Protection Characteristics(SI-8401L) Output Voltage VO (V) VIN=20V, IO=0.5A VIN =33V 20V 4.95 Output Current IO (A) Temperature Characteristics(SI-8401L) 60 5.00 4.85 Input Voltage VIN (V) 100 5.05 Output Voltage VO (V) 4 Efficiency η (%) IO = 0A 1A Output Voltage VO (V) 5.10 7V 5 Ta=25°C 5.15 90 6 Efficiency η (%) Frequency f (kHz) Load Regulation(SI-8501L) Ta=25°C 0 0 1 Ambient Temperature Ta (°C) 2 3 0 0 4 40 80 120 160 Ambient Temperature Ta (°C) Output Current IO (A) Note on Thermal Protection: The thermal protection circuit is intended for protection against heat during instantaneous shortcircuiting. Its operation is not guaranteed for shortcircuiting over extended periods of time. Rise Characteristics(SI-8502L) Efficiency Characteristics(SI-8502L) Efficiency η (%) 1A 8 6 4 2 0 0 V 80 24 0.5A 10 VIN 12.2 =1 3V 3 70 60 50 10 15 Input Voltage VIN (V) 20 0 0 12.1 24V VIN=33V 12.0 18V 15V 11.9 11.8 11.7 40 5 Ta=25°C 12.3 5V 90 IO= 0A Output Voltage VO (V) 12 Load Regulation(SI-8502L) Ta=25°C 100 Output Voltage VO (V) Ta=25°C 14 0.25 0.5 0.75 Output Current IO (A) 1.0 00 0.25 0.5 0.75 1 Output Current IO (A) 101