K-CUT B1209S-1W DC-DC 12 to 9V Isolated Step-down Power Module

Requirement on output load
To ensure this module can operate efficiently and reliably, During operation, the minimum output load is not less than 10% of the full load, and this product should never be operated under no load! If the actual output power is very small, please connect a resistor with proper resistance at the output end in parallel to increase the load, or use our company’s products with a lower rated output power (B_S-W2 & B_D-W2 Series).
Recommended circuit
If you want to further decrease the input/output ripple, an “LC” filtering network may be connected to the input and output ends of the DC/DC converter, see  It should also be noted that the inductance and the frequency of the “LC” filtering network should be staggered with the DC/DC frequency to avoid mutual interference. However, the capacitance of the output filter capacitor must be proper. If the capacitance is too big, a startup problem might arise. For every channel of output, provided the safe and reliable operation is ensured, the greatest capacitance of its filter capacitor is seen.
Output Voltage Regulation and Over-voltage Protection Circuit
The simplest device for output voltage regulation, over-voltage and over-current protection is a linear voltage regulator with overheat protection that is connected to the input or output end in a series
Overload Protection
Under normal operating conditions, the output circuit of these products has no protection against overload. The simplest method is to connect a self-recovery fuse in series at the input end or add a circuit breaker to the circuit.
No parallel connection or plug-and-play

FEATURES

1.  Efficiency up to 70%
2.  Miniature DIP Package
3.  1KVDC Isolation
4.  Temperature Range: -40°C ~ +85°C
5.  Internal SMD Construction
6.  Industry Standard Pinout
7.  No Heat sink is Required No External Component is Required
8.  PCB Mounting
9.  RoHS Compliance
10. 1W DC/DC Converter,+-10% Input/Short Circuit Protection, Unregulated

APPLICATIONS
The B_S-1W & B_D-1W Series is specially designed for applications where a single power supply is isolated from the input power supply in a distributed power supply system on a circuit board.
These products apply to:
1) Where the voltage of the input power supply is fixed (voltage variation ≤ ±10%);
2) Where isolation is necessary between input and output (isolation voltage ≤1000VDC);
3) Where the regulation of the output voltage and the output ripple and noise are not demanding.
Such as purely digital circuits, ordinary low
frequency analogue circuits and IGBT power device-driven circuits, etc.

For  more information read the datasheet

Package Include:

1 x K-CUT B1209S-1W DC-DC 12 to 9V Isolated Step-down Power Module