SAI Series Switching Type Surface-mount and Separate Excitation Type Features ● Surface-mount package with high output and efficiency ● Requires only 4 external components ● Phase correction and output voltage adjustment performed internally ● Built-in reference oscillator (60 kHz) ● Built-in overcurrent and thermal protection circuits Applications ● For power supplies in telephone sets ● For power supplies in office equipment External View ■ Lineup Type No. VO (V) SAI01 5 SAI02 3.3 SAI03 12 SAI04 15 SAI05 13 SAI06 9 IO (A) 0.5 0.4 ■ Absolute Maximum Ratings Parameter Symbol Ratings Unit DC Input Voltage 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 * Refer to Outline Drawing for the case temperature measuring points. ■ Recommended Operating Conditions Ratings Parameter Symbol DC Input Voltage Range VIN Output Current Range IO Operating Junction Temperature Range Tjop SAI01 SAI02 SAI03 SAI04 SAI05 SAI06 7 to 33 5.3 to 33 15 to 33 18 to 33 16 to 33 12 to 33 0 to 0.5 0 to 0.4 –30 to +125 Unit V A °C 5 SAI Series ■ Electrical Characteristics Ratings Parameter Symbol SAI01 SAI02 min typ max min VO Output Voltage SAI03 typ max min SAI04 typ max min SAI05 SAI06 typ max min typ max min Unit typ max 4.80 5.00 5.20 3.17 3.30 3.43 11.40 12.00 12.60 14.25 15.00 15.75 12.35 13.00 13.65 8.55 9.00 9.45 V Condition VIN=20V, IO=0.3A V IN=15V, I O=0.3A V IN=24V, I O=0.3A VIN =27V, I O=0.3A VIN =25V, IO=0.3A VIN =21V, IO=0.3A η Efficiency 80 75 Condition VIN=20V, IO=0.3A VIN=15V, IO=0.3A 89 88 86 VIN=24V, IO=0.3A VIN=27V, IO =0.3A VIN=25V, IO=0.3A VIN =21V, IO=0.3A % f 60 60 60 60 60 60 Condition VIN=20V, IO=0.3A VIN=15V, IO=0.3A VIN=24V, IO=0.3A VIN=27V, IO=0.3A VIN=25V, IO=0.3A VIN =21V, IO=0.3A ∆VOLINE 80 60 100 100 100 90 Switching Frequency Line Regulation 88 100 80 130 130 130 kHz 110 mV Condition VIN =10 to 30V, IO=0.3A VIN =8 to 30V, IO=0.3A VIN =18 to 30V, IO=0.3A VIN =21 to 30V, IO =0.3A VIN =19 to 30V, IO=0.3A VIN =15 to 30V, IO=0.3A ∆VOLOAD Load Regulation 30 40 20 30 70 95 90 120 75 100 50 80 mV Condition VIN=20V, IO=0.1 to 0.4A VIN=15V, IO=0.1 to 0.4A VIN=24V, IO=0.1 to 0.4A VIN=27V, IO=0.1 to 0.4A VIN =25V, IO=0.1 to 0.4A VIN =21V, IO=0.1 to 0.4A Temperature Coefficient of Output Voltage ∆Vo/∆T ±0.5 ±0.5 ±1.5 ±1.5 ±1.5 ±1.0 RREJ 45 45 45 45 45 45 Ripple Rejection dB Condition IS Overcurrent Protection Starting Current f=100 to 120Hz 0.55 0.55 0.45 VIN=10V VIN =8V VIN=18V VIN =21V VIN =19V VIN =15V ■ Block Diagram 1VIN ±0.2 b 1.4±0.2 +0.15 0.75 –0.05 0.45 4.32 a 4.7max. ±0.25 2.54 ±0.15 0.89 0.45 2 SW 3VOS A 0.45 A Condition ■ Outline Drawing (unit:mm) 4 .GND mV/°C 6.8 max. 8.0 3.6 VIN 1 2 SW ±0.2 Ocp Reg. 4.0max. ±0.5 6.3±0.2 Reset Osc +0.15 0.3 –0.05 0.26 0~0.1 1.0 ±0.3 3.0 ±0.2 9.8±0.3 Plastic Mold Package Type Flammability: UL94V-0 Weight: Approx. 0.22 g 6 TSD Drive Comp. a. Type b. Lot number A Case temperature measuring point Terminal Connections (1) Input (2) Switching output (3) Output Voltage Detection (4) Ground 3 VOS Amp. VREF 4 GND ■ Standard External Circuit ■ Ta-PD Characteristics 0.8 VIN SAI DC Input C1 100µF SW + GND 4 GND VOS L1 2 VOUT 3 DC Output D1 SFPB54 (Sanken) + C2 330µF • Glass epoxy substrate (95 × 69 × 1.2) • Natural cooling 0.7 Power Dissipation PD (W) 1 VIN 3.3V 5V : 200µH 12V 13V 15V : 300µH 0.6 0.5 0.4 0.3 0.2 GND 0.1 0 -30 0 25 50 75 100 125 Ambient temperature Ta (°C) ■ Example of Printed-circuit board VIN SW 2 1 L1 DI1 + SAI C1 4 + 3 Vo C 2 GND 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 larger since the internal frame and terminal 4 (GND) are connected to each other. PD = VO • I O 100 VO ηχ –1 –VF • IO 1– VIN The efficiency depends on the input voltage and the output current. Thus, obtain the value from the efficiency graph on page 8 and substitute the percentage in the formula above. VO : Output voltage IO : Output current ηχ : Efficiency (%) VF : Diode forward voltage SFPB54-0.3V Thermal design for D1 must be performed separately. ■ Selecting external components 1. Inductor L1 q It must be suited for switching regulators. Do not use inductors for noise filters as they generate excessive heat. w 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. e The rated current must be satisfied. If the rated current is exceeded, magnetic saturation leads to overcurrent. 2. Capacitors C1 and C2 q They must satisfy the breakdown voltage and allowable ripple current. Use of these capacitors over their derating values shortens their service lives and may also cause abnormal oscillation of the IC. w 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 intend to use an equivalent diode, be sure to make use of 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. 7 SAI Series SAI Series Typical Characteristics Rise Characteristics (SAI01) Efficiency Characteristics (SAI01) Ta=25°C 6 5.2 3 80 2 1 Output Voltage VO (V) 4 VIN 7V 10V 70 20V 25V 33V 60 50 6 8 10 0 0.1 0.2 0.3 Output Current IO (A) Temperature Characteristics (SAI01) 5.3 6 5.2 5 η 80 5.1 VO 70 60 5.0 4.9 f 50 4.8 40 0 50 100 Ambient Temperature Ta (°C) 0 150 Ta=25°C 8 90 8 6 4 2 0 100 Efficiency η (%) Output Voltage VO (V) 10 15 10 Input Voltage VIN (V) 20 0.2 0.3 0.4 0.5 Thermal Protection Characteristics (SAI01) VIN=20V,IO=20mA 6 5 7V 20V 33V 4 3 2 0.5 1.5 1.0 Output Current IO (A) 2.0 4 3 2 1 0 Ta=25°C 12.2 24V 33V 60 50 0 0.1 0.3 0.2 Output Current IO (A) 200 Ta=25°C 12.3 VIN 15V 80 70 150 50 100 Case Temperature TC (°C) Load Regulation (SAI03) 40 5 0.1 Output Current IO (A) Efficiency Characteristics (SAI03) IO 0A 0.2A 0.4A 12 0 Ta=25°C 0 Rise Characteristics (SAI03) 14 4.8 0.5 1 4.7 0 –50 4.9 VIN Output Voltage VO (V) Efficiency η (%) frequency f (kHz) 90 VIN 33V 20V 10V 7V 5.0 Overcurrent Protection Characteristics (SAI01) Outoput Voltage Vo (V) VIN=20V, IO=0.3A 100 0.4 Output Voltage VO (V) 4 Input Voltage VIN (V) Output Voltage VO (V) 2 5.1 4.7 40 0 Ta=25°C 5.3 90 IOUT 0A 0.1A 0.5A Efficiency η (%) Output Voltage VO (V) Ta=25°C 100 5 0 Load Regulation (SAI01) 0.4 VIN 33V 12.1 24V 12.0 20V 15V 11.9 11.8 0 0.1 0.3 0.2 Output Current IO (A) 0.4