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BL Series

BL series products are isolated DC-DC converters suitable for medical and measuring instruments that require low noise.
The BLA and BLC series are compact isolated DC-DC converters that achieve very low noise (8mVp-p) and high efficiency by employing an original resonance circuit. 5-sided metal shield case suppresses radiation noise. Those are extremely reliable products. Ideal for noise isolation between analog and digital circuits. It is also suitable for the amplifiers in a measurement instruments that amplify small signals.
photo_BL

Features

  • Output voltage adjustable
  • ON/OFF control
  • Dual output model can be used as a single output power supply
  • Withstand voltage; 500V AC
  • Overcurrent protection
  • UVLO
  • No use of electrolytic or tantalum capacitors
  • 5-sided metal shielded
  • Operating temperature; -40°C to +85°C (temperature derating required)
  • RoHS compliant

BLA Series

ModelInput Voltage
Vdc[V]		Output Voltage
Vdc[V]		Output Current
[mA]		Line Reg.
[%](typ.)		Load Reg.
[%](typ.)		Noise
[mVp-p](typ.)		Efficiency
[%](typ.)		Size
(W*D*H/mm)		DatasheetPurchase
BLA05-05S303 to 950 to 3000.40.858020.3x14.0x9.7DigiKey
chip1stop
corestaff
BLA05-12S1212 (15)0 to 125 (100)0.350.85582DigiKey
chip1stop
corestaff
BLA05-12W06+/-12 (+/-15)0 to 60 (50)0.75582DigiKey
chip1stop
corestaff
BLA12-05S309 to 1850 to 3000.40.8578DigiKey
chip1stop
corestaff
BLA12-12S1212 (15)0 to 125 (100)0.350.85581DigiKey
chip1stop
corestaff
BLA12-12W06+/-12 (+/-15)0 to 60 (50)0.75582DigiKey
chip1stop
corestaff

Note 1: The output voltage spec in parentheses is for the condition that Vadj is shorted to –Vout.
Note 2: The output current spec in parentheses is the value at the maximum output voltage.
Note 3: The ripple noise and efficiency specs are for the input voltage of 5V at rated load.
Note 4: Ripple noise is measured over 20MHz bandwidth, with MLCCs of 10uF at input and 0.1uF at output.

BLC Series

ModelInput Voltage
Vdc[V]		Output Voltage
Vdc[V]		Output Current
[mA]		Line Reg.
[%](typ.)		Load Reg.
[%](typ.)		Noise
[mVp-p](typ.)		Efficiency
[%](typ.)		Size
(W*D*H/mm)		DatasheetPurchase
BLC05-05S1004.5 to 950 to 10000.40.887723.2x21.1x10.0DigiKey
chip1stop
corestaff
BLC05-12S5012 (15)0 to 500 (400)0.350.85880DigiKey
chip1stop
corestaff
BLC05-12W25+/-12 (+/-15)0 to 250 (200)0.75880DigiKey
chip1stop
corestaff
BLC12-05S1209 to 1850 to 12000.40.8880DigiKey
chip1stop
corestaff
BLC12-12S5012 (15)0 to 500 (400)0.350.85883DigiKey
chip1stop
corestaff
BLC12-12W25+/-12 (+/-15)0 to 250 (200)0.75883DigiKey
chip1stop
corestaff

Note 1: The output voltage spec in parentheses is for the condition that Vadj is shorted to –Vout.
Note 2: The output current spec in parentheses is the value at the maximum output voltage.
Note 3: The ripple noise and efficiency specs are for the nominal input voltage at rated load.
Note 4: Ripple noise is measured over 20MHz bandwidth, with MLCC of 10uF at input and 0.47uF at output.

Very Small Ripple Noise

Low output ripple noise DC-DC converters are required for analog circuits in measurement instruments, analyzers, and image diagnostic equipment.

The BLA and BLC series products realize both small output ripple noise and high efficiency by the adoption of our original resonant circuit.

The left waveforms show the comparison of output ripple noise between a general DC-DC converter and BLA series.

To reduce ripple noise of general DC-DC converters, an LDO may be added in the following stage. The plots on the left show the comparison of the distortion ratio among the three cases of a general DC-DC converter, the BLC series, and a general DC-DC converter with an LDO added in the following stage.

The distortion ratio shows how much the output signal is distorted compared to the input signal and the ratio of the frequency component of the input signal to the frequency component of the output signal other than the input signal. It shows that the BLC series is equivalent to a general DC-DC converter with an LDO added in the following stage. Therefore, by using the BLA or BLC series, the LDO circuit can be removed as shown in the figure below.

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