The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series BTA series is a thin, high efficiency, low noise isolated DC-DC converter. Contrived to adopt new circuit to achieve miniaturization. Circuit construction is high-efficiency and simple. Adjustable output voltage and remote ON/OFF control has been added as a new function. <Features> -Adjustable Output Voltage -Remote ON/OFF Control -Dual Power Supply usable as Single Power Supply -Isolation Voltage AC500V -Built-in over-Current Protection -Built-in Low Input Voltage Protection -Built-in Over Input Current Protection element -No electrolytic Capacitor, No Tantalum Capacitor -MTTF 2,000,000 Hrs -Metallic Shield Cover -Halogen-Free PCB Used -Between Primary and Secondary capacitance approx. 60 to 140pF -Operating Temp. Range -40C to 85C (Temp. Derating required) -RoHS Compliance <Model, Rating> Model combination Table 1 Input V Vdc Output V Vdc Output I mA Line Reg. Load Reg. Noise mV(max.) mV(max.) mVpp(typ.) 3.3 0 to 400 BTA05-03S40 20 40 40 5 0 to 300 BTA05-05S30 4.5 to 9 12(15) 0 to 125 (100) 40 100 BTA05-12S12 30 12(15) 0 to 60 (50) 80 600 BTA05-12W06 3.3 0 to 400 BTA12-03S40 20 40 40 5 0 to 300 BTA12-05S30 9 to 18 12(15) 0 to 125 (100) 40 100 BTA12-12S12 30 12(15) 0 to 60 (50) 80 600 BTA12-12W06 3.3 0 to 400 BTA24-03S40 20 40 40 5 0 to 300 BTA24-05S30 18 to 36 12(15) 0 to 125 (100) 40 100 BTA24-12S12 30 12(15) 0 to 60 (50) 80 600 BTA24-12W06 3.3 0 to 400 BTA48-03S40 20 40 40 5 0 to 300 BTA48-05S30 36 to 76 12(15) 0 to 125 (100) 40 100 BTA48-12S12 30 12(15) 0 to 60 (50) 80 600 BTA48-12W06 Note1 : Specify the type in the column of the model name. D:DIP type, S:SMD type Ex.) DIP type: BTA05-03S40D, SMD type: BTA05-03S40S Note2 : The Output voltage inside () is when it is short between Vadj and -Vout. Note3 : The output current inside () is when adjusted to the max. output voltage. Efficiency %(typ.) 71 77 80 79 73 78 82 81 72 77 81 79 70 75 80 79 1 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series <Specification> Input Voltage Range Rating Output Voltage Adjustable Output Voltage Range Line Regulation Load Regulation Temp. Regulation Ripple/Noise Efficiency Over Current Protection Circuit Over Voltage Protection Circuit Low Input Voltage Protection Over Input Current Protection Remote ON/OFF Stand by Current Isolation Voltage Isolation resistance Primary-Secondary capacitance Operating Temp. Range Storage Temp. Range Humidity Range Cooling Condition Vibration Shock Weight Table2 Refer to Table 1 3.3V3%, 5V3%, 12V3%, 12V5% (Vadj pin at open) 3.15 to 3.6V (For 3.3V), 4.75 to 6.0V (For 5V), 11.4 to 15V (For 12V), 11.4 to 15V (For 12V) Please refer to Table1 (rating Output, for the regulation of Input Voltage Range of Table1) Refer to table1 (Rating Input/Output Voltage, for the regulation of load 0 to 100% (Output is when load is at balance)) 80mV max. (For 3.3V, 5V), 200mV max. (For 12V), 300mV max. (For 12V) (Input/Output rating, For operating temp. -40C to 50C) Refer to Table 1 (Rating Input/Output, At room temp, 20MHz bandwidth) 70% to 82% typ. (Rating Input/Output, At room temp., Refer to table 1) Operates at 105% or more rating load current, auto recovery type. Avoid long time short-circuit Condition. None Available (Refer to p.11) Built-in fuse in the input (refer to p.12) Between 2pin (ON/OFF) and -3pin (-Vin) : Output goes OFF at open, Output goes ON when in short. (Refer to p.9) 0.6 to 2.4mA typ. (Depend on the model) Input-OutputInput-Case, Output-Case AC500V 1min. Input-OutputInput-Case, Output-Case Over 50M at DC500V. Approx. 60 to 140pF (Depend on the model) Operating Temp. -40C to 85C (Need temp. derating from 50C) Storage Temp.-40C to 85C Humidity range 95%R.H. max. (Max. wet bulb 38C, non-condensing) Air Convention (Set in a place where good convection is ensured) 10 to 55Hz All amplitude 1.52mmp-p (2 hours in each orthogonal axes), Scanning time 15min. Acceleration 100G (3directions, 3times each, 18times in total), Persistent time 6ms 3.2g typ. DIP type W=16.6 L=16.8 H=8.4 typ. (mm) (For detail dimensions, refer to the outline on p.7) Outline SMD type W=16.6 L=19.8 H=8.5 typ.(mm) (For detail dimensions, refer to the outline on p.7) NOTE : Unless condition is specified, above specification is regulated as rating value. 2 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 1- Application Range This datasheet applies to the isolated DC/DC converter, BTA series. 2- Model/Rating Model BTA05-03S40D BTA05-03S40S BTA05-05S30D BTA05-05S30S BTA05-12S12D BTA05-12S12S BTA05-12W06D BTA05-12W06S BTA12-03S40D BTA12-03S40S BTA12-05S30D BTA12-05S30S BTA12-12S12D BTA12-12S12S BTA12-12W06D BTA12-12W06S BTA24-03S40D BTA24-03S40S BTA24-05S30D BTA24-05S30S BTA24-12S12D BTA24-12S12S BTA24-12W06D BTA24-12W06S BTA48-03S40D BTA48-03S40S BTA48-05S30D BTA48-05S30S BTA48-12S12D BTA48-12S12S BTA48-12W06D BTA48-12W06S Rating Input Voltage Rating Output 3.3V, 400mA 5.0V, 300mA DC5V 12V, 125mA 12V, each60mA 3.3V, 400mA 5.0V, 300mA DC12V 12V, 125mA 12V, each60mA 3.3V, 400mA 5.0V, 300mA DC24V 12V, 125mA 12V, each60mA 3.3V, 400mA 5.0V, 300mA DC48V 12V, 125mA 12V, each60mA Package DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD DIP SMD 3- Environmental Condition 3-1 Temp. range When Operating : 40C to 85C (Derating required from 50C) When Storage : -40C to 85C 3-2 Humidity Range When Operating : 95%R.H. max. (Max. wet-bulb temp. 38C, non-condensing) When storage : 95%R.H. max. (Max. wet-bulb temp. 38C, non-condensing) 3 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 4-Specification 4-1 Input Condition, Output Characteristics When condition is not mentioned in this data sheet, input is rating input, output is rating output, ambient temp. is 25C5C. Max. Output Voltage Output Constancy. Efficiency *5 Ripple/Noise *6 (%)typ. Input(m Load(m Temp. (mVp-p)typ./ max. *4 V) V) (mV) Output Voltage *2 *2 (V) Output Current (mA) BTA05-03S40 3.33% 0 to 400 20 40 80 40 / 120 71 BTA05-05S30 5.03% 0 to 300 20 40 80 40 / 120 77 123% 0 to 125 40 100 200 30 / 120 80 153% 0 to 100 40 100 200 30 / 120 80 125% 0 to 60 x 2 80 600 300 30 / 120 79 155% 0 to 50 x 2 80 600 300 30 / 120 79 BTA12-03S40 3.33% 0 to 400 20 40 80 40 / 120 73 BTA12-05S30 5.03% 0 to 300 20 40 80 40 / 120 78 123% 0 to 125 40 100 200 30 / 120 82 153% 0 to 100 40 100 200 30 / 120 82 125% 0 to 60 x 2 80 600 300 30 / 120 81 Model *1 BTA05-12S12 Input Voltage (V) 4.5 to 9 BTA05-12W06 BTA12-12S12 9 to 18 BTA12-12W06 155% 0 to 50 x 2 80 600 300 30 / 120 81 BTA24-03S40 3.33% 0 to 400 20 40 80 40 / 120 72 BTA24-05S30 5.03% 0 to 300 20 40 80 40 / 120 77 123% 0 to 125 40 100 200 30 / 120 81 153% 0 to 100 40 100 200 30 / 120 81 125% 0 to 60 x 2 80 600 300 30 / 120 79 155% 0 to 50 x 2 80 600 300 30 / 120 79 BTA48-03S40 3.33% 0 to 400 20 40 80 40 / 120 70 BTA48-05S30 5.03% 0 to 300 20 40 80 40 / 120 75 123% 0 to 125 40 100 200 30 / 120 80 153% 0 to 100 40 100 200 30 / 120 80 125% 0 to 60 x 2 80 600 300 30 / 120 79 155% 0 to 50 x 2 80 600 300 Specify the package in column. D: DIP type(Flow)S: SMD type(Reflow) Output Voltage includes line regulation, load regulation(Balance Load), temp. regulation. 2 output type is when 2 output type has same current. For temp. regulation -40 to 50C. Bandwidth 20MHz When Rating Input Voltage, max. Output Current. 30 / 120 79 BTA24-12S12 18 to 36 BTA24-12W06 BTA48-12S12 36 to 76 BTA48-12W06 *1 *2 *3 *4 *5 *6 4 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 4-2 Capacity of External Capacitor This product has limit to the capacity of external capacitor. Please refer to the below table. Output External Capacitor Capacity +output side -output side *1 0 to 100F -- *1 0 to 100F -- *1 0 to 47F -- *2 *3 0 to 22F 0 to 22F Model BTAXX-03SXXX BTAXX-05SXXX BTAXX-12SXXX BTAXX-12WXXX *1 *2 *3 Sum of C2 and C3 in standard connecting circuit in section6,1 Sum of C2 and C4 in standard connecting circuit in section 6,2 Sum of C3 and C5 in standard connecting circuit in section 6,2 4-3 Temp. Derating Air Convection 100 90 Load Rate(%) 80 70 60 50 40 30 20 10 0 40 30 20 10 0 10 20 30 40 50 60 70 80 90 Ambient Temp.() 5 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 4-4 Measurement Circuit +Vin A Vin + V ON/OFF 1 2 7 BTA-S Series 6 +Vout C1 Vadj SW1 A V SW1 Open = Output OFF Short = Output ON Load SW2 Vin 3 5 SW2 Open: Vout = 3.3V, 5V, 12V Short: Vout = 3.3V3.6V = 5V6V = 12V15V Vout C1: 0.1F (Multilayer Ceramic Capacitor) +Vin A 1 7 +Vout C2 Vin + V ON/OFF 2 BTA-W Series C3 3 6 Vadj V Load V Load 5 SW3 Vin A 4 SW4 A Vout SW3 Open = OutputOFF Short = Output ON SW4 Open: Vout = 12V Short: Vout = 15V C2, C3: 0.1F (Multilayer Ceramic Capacitor) C4 Coaxes cable: 50, 1.5m R1: 51 C4: 0.1F R1 Oscilloscpe (Measuring Ripple/Noise) 4-5 Additional Function Article Over Current Protection Circuit Over Voltage Protection Circuit Low Input Voltage Protection Function Output Voltage Adjustable Range ON/OFF Control Specification/Standarization Operates above 105%, Auto-recovery type None Condition Available 3.15 to 3.6V(BTAXX-03SXXX) 4.75 to 6.0V(BTAXX-05SXXX) 11.4 to 15V(BTAXX-12SXXX) 11.4 to 15V(BTAXX-12WXXX) Output ON at Low(0- 0.4V) Output OFF at open By External Resistor. Refer to 7-2 Refer to 7-1 4-6 Isolation VoltageIsolation Resistance 1- Isolation Voltage Input - OutputInput - CaseOutput - Case : AC500V1min. 2- Isolation Resistance Input - OutputInput - CaseOutput - Case : Over 50M(At DC500V) 6 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 5. Outline and Pin 5-1 DIP type 1- Outline 17.1 max.(16.6 typ.) 3.5 8.5 max. 17.3 max. t=0.3 12.7 16.51 typ. 1 6 7 1 0 9 5.08 7.62 7-0.30.6 2.92 Bottom View 2.7 3.5 0.5 No.8, 9 1.0 5 2 2.54 2.54 1 1 4 8 3 2.54 (1.905) 2.92 (1.905) No.10,1 1 2.7 The outline of the 8 to 11pin is the figure where each pin is viewed from the front side of each pin. Dimensions : mm Tolerance unless otherwise specified0.5 Model name and Manufacturing LOT no. is indicated on upper side. 2- Recommended dimension of the boardPin function 1.905 9 1 +Vin +Vin 2 ON/OFF ON/OFF 3 -Vin -Vin 4 NC -Vout 5 -Vout Common 6 Vadj Vadj 16.51 7 +Vout +Vout Top View 8, 9 Connected to Connected to Case Case Stand off Stand off 7-1.0 2.92 5 2-1.5 8 6 5.08 Upper surface patten is prohibited due to stand offs 7.62 2.54 Function BTA-W 7 3 Pin BTA-S 1 2 2.54 10 4 11 2.54 2.92 12.7 Dimensions : mm 10, 11 7 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 5-2 SMD type 1-Outline 17.1max.(16.6typ.) 8.8max. 0.2min. 17.3max. 1.8 t=0.3 1.8 0.6 Smoothnessbelow0.15 4 2 5 2.54 3 7.62 5.08 2.54 (3.22) 19.81 6 7 (3.22) 2.54 1 Dimension : mm Tolerance without otherwise specified : 0.5 Bottom View Model name and Manufacturing LOT no. is indicated on upper side. 1 2.54 (3.22) 2- Recommended dimension of the boardPin function 7 5.08 2 1.2 2.54 7.62 Upper Surface pattern is prohibited 6 because case is near 5 4 (3.22) 2.54 3 3.2 15.6 3.2 22.0 Pin Function BTA-S BTA-W 1 +Vin +Vin 2 ON/OFF ON/OFF 3 -Vin -Vin 4 NC -Vout 5 -Vout Common 6 Vadj Vadj 7 +Vout +Vout Top View Dimension : mm 8 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 6. Standard Connection Circuit 1-BTA-S Series +Vin +Vin 1 7 +Vout C1 Vin 3 BTA-S Series SW1 SW1 Open = Output OFF Short = Output ON ON/OFF C2 5 C3 Load SW2 Open: Vout = 3.3V, 5V, 12V Short: Vout = 3.3V3.6V = 5V6V = 12V15V Vout SW2 2 6 Vadj C1: 4.7F C2: 4.7F C3: 0.47F 2-BTA-W Series +Vin +Vin 7 1 C1 Vin 3 BTA-W Series SW1 SW1 Open = Output OFF Short = Output ON ON/OFF +Vout C2 C4 C3 Vout C5 5 4 Common SW2 2 6 Load Vadj Load SW2 Open: Vout = 12V Short: Vout = 15V 4.7F C1: C2, C3: 4.7F C4, C5: 0.47F 7. Function 7-1 ON/OFF Control By using ON/OFF Control, output voltage can be ON/OFF controlled without charging or discharging input. Between -Vin pin (Pin3) and ON/OFF pin (Pin2) Low (0 - 0.4V 1mA max.) : Output ON Open (Max. +Vin voltage will generate) : Output OFF +Vin ON/OFF 1 2 or Vin 3 9 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 7-2 Adjustable Output Voltage Output voltage can be set as follow when Vadj pin and -Vout pin is short. Please open this pin when not adjusting the output voltage. Output voltage to connection of Vadj pin -Vout and Model Open Short BTAXX-03SXXX 3.3V 3.6V BTAXX-05SXXX 5.0V 6.0V BTAXX-12SXXX 12V 15V BTAXX-12WXXX 12V 15V Output voltage is adjustable by connecting resistor between Vadj pin and +Vout pin. (Or between Vadj pin and -Vout pin) Note : When adjusting the output voltage, please operate below max. power 7-2-1 To lower the output voltage Output voltage can be lowered by connecting resistor Rb between Adjustable Output Pin (Vadj) and Plus Output Pin (+Vout). Calculation is as below. (Unit of Rb is [k]). BTA-S Series BTA-W Series 7 +Vout 7 +Vout Rb Rb 6 Vadj Load 6 5 Vadj Load Common Load 5 Vout 4 Vout Output Voltage : Vo[V]Connecting resistor : Rb[k] BTAXX-03SXXX Vo = 1.26 x (91.5 + 2.62 Rb) / (39.6 + Rb) Rb = (39.6 Vo - 115.3) / (3.30 - Vo) Adjustable range is up to 3.15V.Rb62 BTAXX-05SXXX Vo = 1.26 x (84.8 + 3.98 Rb) / (31.8 + Rb) Rb = (31.8 Vo - 106.85) / (5.01 - Vo) Adjustable range is up to 4.75V.Rb160 BTAXX-12SXXX Vo = 1.26 x (201 + 9.53 Rb) / (57 + Rb) Rb = (57 Vo - 253.26) / (12.01 - Vo) Adjustable range is up to 11.4V.Rb620 BTAXX-12WXXX Vo = {1.26 x (429 + 19.1 Rb) / (103 + Rb)} / 2 Rb = (206 Vo - 540.54) / (24.07 - 2 Vo) Adjustable range is up to 11.4V. (Rb1500) 10 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 7-2-2 To raise the output voltage Output voltage can be raised by connecting resistor Ra between Adjustable Output Pin (Vadj) and Minus Output Pin (-Vout). (Unit for Ra is[k]) BTA-S Series BTA-W Seires 7 +Vout 7 +Vout Load 6 Vadj Load 5 6 Common Vadj Ra 5 Ra 4 Vout Load Vout Output Voltage : Vo[V]Connecting resistor : Ra[k] BTAXX-03SXXX Vo = 1.26 x (91.5 + 2.62 Ra) / (32 + Ra) Ra = (115.3 - 32 Vo) / (Vo - 3.30) BTAXX-05SXXX Vo = 1.26 x (84.8 + 3.98 Ra) / (17.8 + Ra) Ra = (106.85 - 17.8 Vo) / (Vo - 5.01) BTAXX-12SXXX Vo = 1.26 x (201 + 9.53 Ra) / (16.9 + Ra) Ra = (253.26 - 16.9 Vo) / (Vo - 12.01) BTAXX-12WXXX Vo = {1.26 x (429 + 19.1 Ra) / (18 + Ra)} / 2 Ra = (540.54 - 36 Vo) / (2 Vo - 24.07) 7-3 Output Over Current Protection Function Output voltage will be lowered when output current is in state of over current and start operating over current protection circuit. (Over current protection set point : 105 to 250% of rating current value) It will automatically recover when over current state is released. In order to avoid from damage, please do not hold the over current state for more than 30sec. If by any reason does not auto recover after releasing, please off the output at ON/OFF control or switch off to reactivate. 7-4 Low Input Voltage Protection Function This product builds in low input voltage protection function to avoid malfunction at low input voltage. Commencing operation and termination voltage range is within the below table. Model BTA05 BTA12 BTA24 BTA48 Commencing operation Termination Voltage 3.0 to 4.5V 6.0 to 9.0V 13 to 18V 27 to 36V 11 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 7-5 Input Circuit Protection Function Fuse is built in at input in order to protect circuit at secondary side when overcurrent flows to input by some abnormalities. Rating current and fusing current of the Built-in fuse is as below table. To assure fusing at abnormality, current capacity of power supply should be more than fusing current which is stated in below table. Model Rating Current Fusing Current BTA05 1.25A Above 2.5A BTA12 0.75A Above 1.5A BTA24 0.75A Above 1.5A BTA48 0.75A Above 1.5A 8. An example method to prevent inverse connection of input power supply. This product will be damaged when input polarity is connected reversely. Please add protection circuit when connection may be reversed. Below diagram is an example of using fuse and diode. FUSE Vin + D1 +Vin + 1 7 BTA-S Series C1 ON/OFF Vin +Vout C2 + C3 Load 2 3 5 Vout 12 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 9. Soldering Conditions Soldering is to be executed under the following conditions. 1- Soldering Iron (DIP Type, SMD Type) 380C 3sec. 2- Soldering Dip (DIP type) 260C 10sec. 3- Reflow (SMD type) Reflow Temp. Profile Solder Sn-3Ag-0.5Cu A 1.0 to 3.0/s A' Ty1: Ty2: Ty1 to Ty2: B 1.0 to 4.0/s B' TP: Above 225: C 1.0 to 5.0/s Surface Temp. () TP 225 Ty2 Ty1 A A' B B' 15010 17010 40 to 100s 245max. 20 to 40s C Soldering Dip Time(s) Do not vibrate the product during reflow. Reflow can be done only once. (Please do not mount backside.) NOTE: Eutectic soldering can be used within condition as above. 10. Material of Pin and case Pin : Phosphor bronze (Ni Foundation Sn Plating) Case : SPCC (Ni Plating) 11. Vibration / Shock Test Vibration : 10 to 55Hz All Amplitude 1.52mmp-p (2 hours in each of 3 orthogonal axes) Scanning time 15min. Shock : Acceleration 100G (3 times in each of 3 orthogonal axes, Total 18 times ) Duration 6ms 12. Cleaning Condition This product can not be washed whole. No clean solder paste is recommended for this product. When and if cleaning should be necessary only for DIP type, use IPA and hand-wash only soldered surface by brush cleaning. After cleaning be sure to dry up before using. 13 DC-DC Converter BDD20081203 The Fifth Generation, Ultra Small Size, Isolated DC-DC Converter 1.5Watt BTA Series 13. Environmental Compliance This product is RoHS compliance. Halogen free material is used for PCB. {Note} RoHS Compliance : Based on EU Directive2002/95/EC. 14. Precautions -This product intends to be used for general electronic equipments (Clerical work machines, Telecommunications equipments, and Measurement equipments). Therefore, do not use for medical equipments, nuclear power equipments, and trains, etc. the malfunction and damage of which may influence directly to human life and property. Please confirm when using it in the case except general electronic equipment. -For this product, parallel operation is not possible. -For mounting this product, please do not use connector or socket. The performance may not be fulfilled by the effect of contacting resistor. Please mount to PCB by soldering. -This product has a built-in over-current, short protection, but long time short circuit will cause failure, so avoid it. -The product may be damaged if it is used under nonstandard electric and environmental conditions such as temperature. Please be sure to keep the standards. -Do not store in a place where corridible gas may be generated or at a dusty place. -The soldering may degrade, so be careful when safekeeping in a place with high-temperature, hu,idity and rapid temperature change for more than 1 year. -There is a possibility of damage by static. When the worker has electrified static, please earth discharge and working on an earthed worktable will be recommended. -This product does not have a built in over voltage protection. -No test certificate is attached to this product. 15. Guarantee This product shall be guaranteed for 5 years. During this period, if there should be any failure definitely due to our designing or manufacturing workmanship, we will repair or replace it with new one at our own expense. But in case that it should be modified and/or made internal remodeling by buyer itself whatsoever, we can not guarantee it. This guarantee shall cover only 1.5Watt BTA series. 14 DC-DC Converter BDD20081203