●SI-8800L/8900L Series SI-8800L/8900L Series Separate Excitation Switching Type with Transformer ■Features • • • • • • Integrated switching IC and transformer construction Requires only input/output and soft start capacitors as external components Low switching noise Heatsink not required Built-in overcurrent protection circuit (+5V) ±2–output lineup (SI-8811L, SI-8911L) ■Applications • Telephone power supplies • Onboard local power supplies ■Lineup Ch1 Part Number Ch2 VO(V) IO(A) VO(V) IO(A) SI-8811L +5 0.45 –5 0.05 SI-8911L +5 0.3 –5 0.1 SI-8921L/8922L +5 0.6 ■Absolute Maximum Rating Ratings Symbol Parameter SI-8811L SI-8911L Unit SI-8921L SI-8922L DC Input Voltage VIN 35 60 Power Dissipation PD 1.15 Junction Temperature Tj +100 °C Storage Temperature Tstg –25 to +85 °C 1.3 V 1.67 1.67 W ■Recommended Operating Conditions Ratings Parameter Symbol SI-8811L min. typ. SI-8911L max. min. typ. SI-8921L max. min. typ. SI-8922L max. min. typ. Unit max. DC Input Voltage Range VIN 12 20 30 24 40 55 24 40 55 20 40 55 V Output Current Range 1 IO1 50 250 450 20 150 300*2 0 300 600 0 300 600 mA Output Current Range 2 IO2 0 –20 –50*1 0 –50 –100 Operating Temperature Range Top –10 +70 –10 *1: Output current 2 depends on the input/output conditions *2: If IO2=50mA or more, the condition IO1>0.5×IO2 is recommended. 102 +60 mA –10 +65 –10 +65 °C ●SI-8800L/8900L Series ■Electrical Characteristics (Ta=25°C) Ratings Parameter Symbol SI-8811L VO1 Output Voltage 1 SI-8911L VO2 η Efficiency min. typ. max. min. typ. max. min. typ. max. 4.75 5.00 5.25 4.75 5.00 5.25 4.95 5.10 5.20 4.95 5.10 5.20 –5.00 –5.25 –4.75 –5.00 65 f 50 68 ∆Vr1 50 50 Voltage 1 Conditions ∆Vr2 Conditions % 60 68 80 50 80 60 68 80 50 80 kHZ mVp-p 50 50 mVp-p Recommended operating conditions (typ.) 22 24 Conditions Voltage 72 Recommended operating conditions (typ.) VSt Operation Starting 72 Recommended operating conditions (typ.) Switching Ripple Voltage 2 –5.25 Recommended operating conditions 72 Switching Ripple V Recommended operating conditions Conditions Switching Frequency Unit max. –4.75 Conditions SI-8922L typ. Conditions Output Voltage 2 SI-8921L min. 22 24 17 20 V Recommended operating conditions (typ.) ■Outline Drawing (unit: mm) SI-8811L, 8911L, 8921L, 8922L 19 a b 22 ±0.2 y ±0.2 o a. Part Number b. Lot Number SK q 16.8 ±0.2 t Open Air Type Weight: Approx. 9.3g ±0.2 22 ±0.1 1 ±0.6 0.8max. (4×P3.175=12.7) (16.5) 4 ,,,,,,,,,, ,,,,,,,,,,, 18 ±0.6 Terminal 1 marking 103 ●SI-8800L/8900L Series ■Block Diagram SI-8811L SI-8911L 3 VIN (+) 9 VO1 1 9 Tr1 VO1 VIN 1 8 3 T1 Amp. Vref T1 Amp. GND GND 7 Vref 8 PWM OSC VIN (–) Start Drive PWM OSC OCP Reg. VO2 7 5 Tr1 VO2 Start 4 2 S.S Drive –Reg. OCP 2 S.S 6 5 6 4 SI-8921L/8922L 7 VIN 1 VO 6 3 Amp. T1 Vref PWM OSC Start Drive Tr1 GND 5 OCP 2 S.S ■Standard External Circuit VIN (+) 1 2 + 9 + C1 SI-8811L 3 4 7 5 6 VIN C4 GND 8 + C2 VIN (–) VO1 + C5 VO2 + C3 : 35V/470µF : 16V/10µF : 10V/220µF : 16V/1200µF : 10V/47µF C1,2,3,5 : Nippon Chemi-con SME Series or equivalent C4 : Nippon Chemi-con SXE Series or equivalent 1 2 + 9 3 SI-8911L 8 + C1 C2 4 C3 + VO1 + 7 5 + C4 GND C5 6 C1(for smoothing VIN) C2(for soft start) C3(for smoothing VO2Reg input) C4(for smoothing VO1) C5(for smoothing VO2) : 63V/220µF : 10V/33µF : 10V/220µF : 16V/1200µF : 10V/100µF VO2 C1,2,3,5 : Nippon Chemi-con SME Series or equivalent C4 : Nippon Chemi-con SXE Series or equivalent GND VIN 1 C1(for smoothing VIN) C2(for soft start) C3(for smoothing VO2) 2 SI-8921L 7 + + C1 C2 GND 104 C1(for smoothing VIN) C2(for soft start) C3(for smoothing VO2Reg input) C4(for smoothing VO1) C5(for smoothing VO2) 3 SI-8922L 6 4 5 + C3 : 63V/180µF : 10V/22µF : 10V/1200µF VO GND C1,2 C3 : Nippon Chemi-con SME Series or equivalent : Nippon Chemi-con SXE Series or equivalent ●SI-8800L/8900L Series ■Ta-PD Characteristics SI-8811L 0.5 0 0 25 50 75 Ambient Temperature Ta (°C) 100 100 –1 ηχ SI-8911L VO :Output voltage IO :Output current ηχ :Efficiency (%) 1.0 0.5 0 0 25 50 SI-8921L 8922L 1.0 PD=VO•IO SI-8911L Power Dissipation PD (W) Power Dissipation PD (W) SI-8921L 8922L 1.5 1.5 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. ■Caution 1. A low-impedance capacitor suitable for switching applications must be used for the external capacitor and must be connected as close to the IC as possible in order to assure low ripple voltage and stable switching operation. 2. The SI-881L/8911L series does not have a built-in overcurrent protection circuit on terminal VO2(–5V). Thus, avoid short-circuit conditions that may cause an overcurrent. 3. Do not connect VIN(–) of SI-8811L to GND. The overcurrent protection circuit may not work if they are connected. 4. Terminals left unconnected in the connection diagram must not be connected to other circuits. 5. The IC's metallic heatsink is electrically floating. Do not connect it to GND or any other circuit. 6. Since the SI-8800L and 8900L series have an open-package construction, they can be operated in specific environments. Verify the operating environment and use the IC within the conditions indicated in the reliability data. 105 ●SI-8800L/8900L Series ■Typical Characteristics (Ta=25°C) SI-8811L SI-8911L Rise Characteristics lO1=50mA lO2 =0mA lO1=250mA lO2 =–20mA 2 lO1=450mA lO2 =–50mA 0 2 4 6 8 10 12 –2 14 16 18 VIN 20 (V) lO1=50mA lO2 =0mA lO1=250mA lO2 =–20mA lO1=450mA lO2 =–50mA –4 Rise Characteristics 6 6 4 5 lO1 20 to 30mA 2 0 5 10 20 25 30 35 VIN 40 (V) –2 lO2 0 to 100mA Efficiency Characteristics 25V 30V Efficiency η (%) 65 10 15 20 25 30 35 40 VIN=55 45 V 70 70 60 5 Efficiency Characteristics 55V VIN= 70 2 80 V 40 60 Efficiency η (%) 75 3 Input Voltage VIN (V) 80 VIN=12V 15V 20V 4 0 0 Input Voltage VIN (V) Efficiency Characteristics 80 0.3A 1 –4 Input Voltage VIN (V) Efficiency η (%) 15 –6 –6 0.6A lO=0 Output Voltage VO (V) 4 VO2 (V) Output Voltage VO1 (V) VO2 (V) Output Voltage VO1 (V) 6 SI-8921L Rise Characteristics V 24 50 40 48 40VV 30V 24V 50 40 30 60 30 20 IO2 = –50mA constant 0 0 50 IO2 = –100mA constant 100 150 200 250 300 350 400 450 500 Output Current 1 lO1 (A) SI-8922L 8 6 3 0.6A 0.5A IO=0.4A Output Voltage VO (V) 7 4 2 1 00 10 30 20 40 Input Voltage VIN (V) Efficiency Characteristics 80 VIN=55 V 48V 40V 30V 24V Efficiency η (%) 70 60 50 40 30 20 00 0.1 0.2 0.3 0.4 0.5 0.6 Output Current lO (A) 106 50 100 150 200 250 300 Output Current 1 lO1 (A) Rise Characteristics 5 0 0 0.7 0.8 350 400 0 0 0.1 0.2 0.3 0.4 0.5 0.6 Output Current lO (A) 0.7 0.8