●SAI Series SAI Series Surface-Mount, Separate Excitation Switching Type ■Features • • • • • • • Surface-mount package Output current: 0.4 to 0.5A High efficiency: 75 to 89% Requires only 4 external components Phase correction and output voltage adjustment performed internally Built-in reference oscillator (60kHz) Built-in overcurrent and thermal protection circuits ■Applications • Power supplies for telecommunication equipment • Onboard local power supplies ■Lineup Part Number SAI01 SAI02 SAI03 SAI04 SAI06 VO(V) 5.0 3.3 12.0 15.0 9.0 IO(A) 0.5 0.4 ■Absolute Maximum Ratings Symbol Ratings Unit DC Input Voltage Parameter VIN 35 V Power Dissipation PD 0.75 W Junction Temperature Tj +125 °C Storage Temperature Tstg –40 to +125 °C SW Terminal Applied Reverse Voltage VSW –1 V Thermal Resistance(junction to case) Rth(j-c) 20 °C/W ■Recommended Operating Conditions Parameter DC Input Voltage Range VIN Output Current Range IO Operating Junction Temperature Range 72 Ratings Symbol Tjop SAI01 SAI02 SAI03 SAI04 SAI06 7 to 33 5.3 to 28 15 to 33 18 to 33 12 to 33 0 to 0.5 0 to 0.4 –30 to +125 Unit V A °C ●SAI Series ■Electrical Characteristics (Ta=25°C) Ratings Parameter Symbol SAI01 VO Output Voltage Conditions typ. max. min. 4.80 5.00 3.30 Conditions VIN=15V, IO=0.3A Ripple Rejection 9.45 89 86 VIN=27V, IO=0.3A VIN=21V, IO=0.3A % 60 60 60 60 60 VIN=20V, IO=0.3A VIN=15V, IO=0.3A VIN=24V, IO=0.3A VIN=27V, IO=0.3A VIN=21V, IO=0.3A 100 100 90 100 60 30 80 VIN=8 to 28V, IO=0.3A 40 20 130 130 kHZ 110 30 70 95 90 120 50 80 VIN=24V, IO=0.1 to 0.4A VIN=27V, IO=0.1 to 0.4A VIN=21V, IO=0.1 to 0.4A ∆VO/∆Ta ±0.5 ±0.5 ±1.5 ±1.5 ±1.0 RREJ 45 45 45 45 45 f=100 to 120HZ f=100 to 120HZ f=100 to 120HZ f=100 to 120HZ f=100 to 120HZ IS1 0.55 0.55 Conditions VIN=10V 0.45 VIN=8V 0.45 VIN=18V mV/°C dB 0.45 VIN=21V A VIN=15V (unit: mm) b 1VIN 4.32 max. a 4.7 ±0.25 4 .GND ±0.2 2 SW 3VOS ±0.2 0.75 –0.05 +0.15 2.54 ±0.15 mV VIN=15V, IO=0.1 to 0.4A ■Outline Drawing 0.89 mV VIN=18 to 30V, IO=0.3A VIN=21 to 30V, IO=0.3A VIN=15 to 30V, IO=0.3A VIN=20V, IO=0.1 to 0.4A Overcurrent Protection 1.4 max. 6.8 3.6 a. Part Number b. Lot Number A Case temperature measuring point ±0.2 4.0 ±0.5 8.0 A max. ±0.2 q w e r VIN SWOUT VOS GND 0.25 0.3 –0.05 +0.15 6.3 Plastic Mold Package Type Flammability: UL94V-0 Weight: Approx. 0.22g 0~0.15 3.0 ±0.3 1.0 9.8 ±0.2 ±0.3 ■Standard External Circuit ■Block Diagram VIN V VIN=21V, IO=0.3A 88 Conditions Starting Current VIN=27V, IO=0.3A 9.00 VIN=24V, IO=0.3A ∆VOLOAD Temperature Coefficient of Output Voltage VIN=24V, IO=0.3A 8.55 75 80 Conditions 11.40 12.00 12.60 14.25 15.00 15.75 Unit typ. max. VIN=15V, IO=0.3A Conditions VIN=10 to 30V, IO=0.3A Load Regulation 3.43 SAI06 typ. max. min. 80 ∆VOLINE Line Regulation 3.17 SAI04 typ. max. min. VIN=20V, IO=0.3A f Switching Frequency 5.20 VIN=20V, IO=0.3A Conditions SAI03 typ. max. min. η Efficiency SAI02 min. 1 2 SWOUT OCP Reg. OSC VIN 1 SAI TSD Reset SWOUT VIN Drive C1 100µF Comp. + GND 4 VOS L1 2 3.3V 5V : 200µH 9V 12V 15V : 300µH VO 3 D1 SFPB54 (Sanken) + C2 330µF 3 VOS Amp. GND GND VREF 4 GND 73 ●SAI Series ■Example of Printed Circuit Board VIN a) For optimum operation, there must be only one GND line originating from terminal 4 and each component must be connected with the shortest possible wiring. b) To prevent heating of the IC, it is best to make the GND pattern as large as possible since the internal frame and terminal 4 (GND) are connected to each other. SW 2 1 + L1 DI1 C1 SAI 4 + 3 GND C2 VO ■Ta-PD Characteristics 0.8 0.7 Power Dissipation PD (W) PD=VO•IO • Glass epoxy substrate (95×69×1.2) • Natural cooling 0.6 100 –1 ηχ –VF•IO 1– VO VIN The efficiency depends on the input voltage and the output current. Thus, obtain the value from the efficiency graph on page 75 and substitute the percentage in the formula above. 0.5 0.4 0.3 0.2 0.1 0 –30 0 25 50 75 100 125 Ambient Temperature Ta (°C) VO :Output voltage IO :Output current ηx :Efficiency (%) VF :Diode forward voltage SFPB54-0.3V Thermal design for D1 must be considered separately. ■Selecting External Components 1. Inductor L1 1) It must be suited for switching regulators. Do not use inductors as noise filters as they generate excessive heat. 2) It must have the appropriate inductance value. If the inductance is too small (150µH or lower), abnormal oscillation may occur causing operation problems in the overcurrent protection circuit within the rated current range. 3) The rated current must be satisfied. If the rated current is exceeded, magnetic saturation leads to overcurrent. 2. Capacitors C1 and C2 1) They must satisfy the withstand 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. A low-impedance type capacitor is recommended for C2 to ensure minimum ripple voltage and stable switching operation. 3. Diode D1 The Sanken SFPB54 diode is recommended for D1. If you intended to use an equivalent diode, be sure to use a Schottky Barrier diode and make sure that the reverse voltage applied to terminal 2 of the IC does not exceed the value (–1V) given in the absolute maximum ratings. If you use a fast recovery diode or any other diode, application of a reverse voltage generated from the recovery or ON voltage of the diode may damage the IC. Application Variable output voltage Output voltage can be adjusted in the same way as SI-8000S in page 85. 74 ●SAI Series ■Typical Characteristics Rise Characteristics(SAI01) Efficiency Characteristics(SAI01) Ta=25°C 6 0.1A 2 = VIN V 20V 10 60 25V 33V 3 7V 50 1 8 0 0 10 0.1 Input Voltage VIN (V) 0.4 0 0 0.5 0.1 4.9 f 50 4.8 40 4.7 0.4 0.5 Thermal Protection Characteristics(SAI01) VIN=20V, IO=20mA 5 20V 4 3 2 4 3 2 1 1 0 150 100 0.3 6 V 5.0 0.2 Output Current IO (A) Ta=25°C =7 5.1 VO 50 4.8 5 Output Voltage VO (V) 80 0 0.3 6 5.2 η 0 –50 7V 4.9 Overcurrent Protection Characteristics(SAI01) 5.3 Output Voltage VO (V) 90 60 0.2 VIN VIN=20V, IO=0.3A 70 10V Output Current IO (A) Temperature Characteristics(SAI01) 100 20V VIN=33V 5.0 Output Voltage VO (V) 6 V 4 33 2 5.1 4.7 40 0 0 Efficiency η (%) Frequency f (kHz) Output Voltage VO (V) Efficiency η (%) A IO= 0A 0.5 Output Voltage VO (V) 5.2 80 70 Ta=25°C 5.3 90 5 4 Load Regulation(SAI01) Ta=25°C 100 00 0.5 1.0 1.5 0 0 2.0 Ambient Temperature Ta (°C) 50 100 150 200 Case Temperature TC (°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(SAI03) Efficiency Characteristics(SAI03) 100 8 6 60 50 2 40 5 10 15 Input Voltage VIN (V) 20 V 33 70 4 0 0 V 24 V 0.2A 12.2 =1 IN 80 Efficiency η (%) 10 0 Ta=25°C 12.3 5V 0. 4A 0A 90 IO= Output Voltage VO (V) 12 Load Regulation(SAI03) Ta=25°C Output Voltage VO (V) Ta=25°C 14 12.1 12.0 VIN=33V 24V 20V 15V 11.9 11.8 0 0.1 0.2 0.3 Output Current IO (A) 0.4 0 0 0.1 0.2 0.3 0.4 Output Current IO (A) 75