Bel Power Solutions point-of-load converters are recommended for regulated bus converters in intermediate bus architectures (IBAs). The YNV12T10 non-isolated DC-DC converter provides up to 10 A of output current in an industry standard through hole (SIP) package. The YNV12T10 converter operates from a 9.614 VDC input. These converters are ideal for intermediate bus architectures where point-of-load power is often required. They provide a resistor-programmable adjustable output voltage from 0.7525v to 5.5v.
YNV12T10 converters provide excellent thermal performance even in high temperature environments

Minimum airflow. This is achieved through the use of circuitry, packaging and processing techniques
RoHS lead-free and lead-free solders are super efficient, superior thermal management and products with very smooth body contours.
Provides up to 10 A (50 W) with smooth body contour and heat sink Industry standard footprint and pinout minimize impedance to system airflow, enhancing single entry (SIP) packages for upstream and downstream equipment: 2.0 "x 0.575 " x 0.28" cooldown.
(50.8 x 14.59 x 7.11 mm) assembled using 100 % automation, combined with a weight: 0.25 oz [7 g] advanced power electronics and thermal design, enabling a synchronous buck converter topology in a product with extreme reliability.
Start-up to Pre-Biased Output No Minimum Load Operating Ambient Temperature: -40°C to 85°C
Remote output detection Intermediate bus structure Remote on/off (positive or negative) § Data communication  Fixed frequency operation § Distributed power architecture Auto reset output over current protection? Automatic reset of servers and workstations Over temperature protection High reliability, MTBF = 35.5 million hours All materials comply with UL94, V-0 flammability rating? Efficient - No need for a heatsink to pass the latest and revised ITE? Reduced total solution board area Safety standards, UL/CSA 60950-1 and IEC60950-1? Minimize part numbers in inventory

Input and output impedance
The YNV12T10 converter should be connected to the DC power supply with low impedance. In many applications, the inductance associated with the distribution from the power supply to the converter input can affect converter stability. To ensure the stability of the converter and reduce the input ripple voltage, decoupling capacitors are recommended. The converter has an internal input capacitance of 20µF and very low ESR ceramic capacitors. In a typical application, a low ESR tantalum or POS capacitor will suffice to provide adequate ripple voltage filtering and at the input of the converter. However, to reduce the input ripple voltage, it is recommended to use very low ESR ceramic capacitors 47µF-100µF at the input of the converter. They should be as close as possible to the input pins of the converter.
The YNV12T10 is designed for stable operation with or without external capacitors. It is recommended to place low ESR ceramic capacitors (47µF minimum) as close to the load as possible to improve transient performance and reduce output voltage ripple.

When connecting loads to the output pins of the converter, it is important to maintain low resistance and low inductance PCB traces in order to maintain good load regulation.
On/Off (pin 10)
The ON/OFF pin is used to remotely turn the power converter on or off via a system signal. There are two remote control options available, positive logic (standard option) and negative logic, both referenced to GND. A typical connection is shown in Figure A.
Forward logic version turns the converter on when the ON/OFF pin is at logic high or left open and turns off the converter when it is logic low or shorted to ground

Figure A: Circuit configuration for on/off function.
The negative logic version turns on the converter when the ON/OFF pin is at logic low or left open, and turns off the converter when the ON/OFF pin is at logic high or connected to a VIN.
The ON/OFF pin is internally pulled up to the VIN for the positive logic version and the VIN for the negative logic version. TTL or CMOS logic gates, open collector (open drain) transistors can be used to drive the on/off pins. When using an open-collector (open-drain) transistor with the negative logic option, as shown in Figure a, add a 75K pull-up resistor (R*) to the VIN (Vin); the device must be able to:
- Drops to 0.2 mA at low level voltages of  0.8V - Rises to 0.25 mA at high logic levels of 2.3V–5V - Rises to 0.75 mA when connected to VIN.
Remote control (pin 3)

The converter's remote sensing function compensates for the voltage drop that occurs only between the converter's output pins and the load. The sensing pin (pin 3) should be attached to the load or where adjustment is required. There is no sense function on the output ground return pin where a solid ground plane should provide a low voltage drop.
If remote sensing is not required, the sense pin must be connected to any output pin to ensure that the converter will regulate at the specified output voltage. Without these connections, the converter will output a slightly higher output voltage than specified.

Remote detection circuit configuration.
Since the sense wires carry minimal current, there is no need for large traces on the end user board. However, the sense trace should be close to the ground plane to minimize system noise and ensure optimal performance.
When utilizing the remote sensing feature, care must be taken not to exceed the maximum allowable output power capability of the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given conditions.
When using remote sensing, the output voltage of the converter can be 0.5V higher than rated to maintain the desired voltage across the load. Therefore, the designer must reduce the maximum current (originally obtained from the derating curve) by the same percentage as necessary to ensure that the actual output power of the converter remains at or below the maximum allowable output power.
Output Voltage Programming (Pin 9)
The output voltage can be programmed from 0.7525V to 5.5V by connecting an external resistor between the trim pin (Pin 9) and the ground pin (Pin 5) The trimmer resistor for the desired output voltage can be calculated using the following formula RTRIM

Output voltage programming configuration.
Note that the tolerance of the trimmer resistor directly affects the output voltage tolerance. Standard 1% or 0.5% resistors are recommended; for tighter tolerances, two parallel resistors are recommended instead of one of the standard values in Table 1.
The ground pin of the trimmer resistor should be connected directly to the converter ground pin (pin 5) with no voltage drop across it. Table 1 provides trimmer resistor values for common output voltages.

Input Undervoltage Lockout Input undervoltage lockout is standard on this converter. When the input voltage drops below a predetermined voltage, the converter will shut down; when the vehicle identification number (Vin) returns to the specified range, the converter will automatically start.
The input voltage must be at least 9.6V (usually 9V) for the converter to turn on. Once the converter turns on, it turns off when the input voltage drops below 8.5V.
Output Over Current Protection (OCP)
The converter has overcurrent and short circuit protection. When an overcurrent condition is sensed, the converter will enter hiccup mode. Once the overload or short-circuit condition is removed, Vout will return to its nominal value.
Overheating Protection (OTP)
The frequency converter will shut down in an overtemperature condition to protect itself from overheating caused by operation outside the thermal derating curve or during abnormal conditions such as system fan failure. After the torque converter has cooled to a safe operating temperature, it will restart automatically.
Safety requirements are revised through the latest edition of ITE safety standards, UL/CSA 60950-1 and IEC60950-1.
Under any operating conditions, the maximum DC voltage between the two pins is VIN. Therefore, the device has an extra-low voltage (ELV) output that meets SELV requirements with all input voltages at ELV.
The converter has no internal fuse. To comply with safety agency requirements, a fuse with a maximum rating of 15 amps must be used in series with the input line.
Basic Information The converter has been characterized for many operational aspects including thermal derating (maximum load current as a function of ambient temperature and airflow) vertical and horizontal mounting, efficiency, startup and shutdown parameters, output ripple and noise, transient response Load changes, overloads and short circuits.
Plots are numbered as shown in figure xy, where x represents different output voltages and y is related to a specific curve (y=1 for vertical thermal derating, ...). For example, Figure x.1 typically refers to vertical thermal derating of all output voltages.
The following pages contain specific plots or waveforms related to the converter. The following are additional comments on specific data.
Test Conditions All thermal and efficiency data were obtained with the converter soldered to a test board, specifically a 0.060" thick four-layer printed wiring board (PWB). The top and bottom layers were not metallized. The two inner layers consist of two oz copper composition to provide traces to connect to the converter.
The lack of outer metallization and limited thermal connections ensure that heat transfer from the converter to the PWB is minimized. This provides a worst-case but consistent situation for thermal derating purposes.
All measurements requiring airflow were performed at di/dt's vertical and horizontal wind tunnel facilities using infrared (IR) thermal imaging and thermocouples.
Ensuring that components on the converter do not exceed their ratings is important to maintain high reliability. If the converter is expected to operate at or near the maximum load specified on the transition curve, it is prudent to check the actual operating temperature in the application. Thermal imaging is best; if this capability is not available, a thermocouple can be used. Bel Power Solutions recommends using AWG#40 size thermocouples to ensure measurement accuracy. Careful placement of thermocouple leads will further reduce measurement errors. Refer to Figure D for optimal measurement thermocouple locations.
The relationship between the load current and the ambient temperature and airflow velocity is shown in the figure. The maximum temperature is 120°C. Ambient temperature varies between 25°C and 85°C, airflow rates from 30 to 500 LFM (0.15m/s to 2.5 m/s), vertical and horizontal converter installations. The airflow during the test was parallel to the long axis of the converter, from the input pins to the output pins.
For each set of conditions, the maximum load current is defined as the lowest value:
(i) any MOSFET temperature indicated by the MOSFET temperature shall not exceed the output current at the maximum specified temperature (120°C), or (ii) the maximum current rating of the converter (10A) during normal operation shall not exceed the maximum FET temperature less than or equal to the derating curve of 120°C. To operate within the derating curve, the temperature on the PCB at the thermocouple location shown in Figure D should not exceed 120°C.

efficiency
Efficiency vs. load current plot at 25°C ambient temperature, 200 LFM (1 m/s) airflow velocity, and input voltages of 9.6 V, 12 V, and 14 V.
Power consumption
Power consumption vs. load current at Ta=25°C, airflow velocity of 200 LFM (1 m/s), vertical installation, input voltages of 9.6 V, 12 V, and 14 V.
Ripple and Noise The output voltage ripple waveform is measured at full rated load current. Note that all output voltage waveforms are measured with 1µF ceramic capacitors.
The output voltage ripple and input reflected ripple current waveforms were obtained with the test setup shown in Figure E.