Input Specifications

Input Voltage (+In to -In)	See Chart Above
Input Overvoltage (100mSec)	24Vin; 50VDC: 48Vin; 80VDC
Input Ripple Rejection (120Hz)	60dB, typ.
Undervoltage Lockout	Yes
Input Reverse Voltage Protection	Yes
Inrush Current	0.5A²S, max.
Reflected Ripple, 12uH Source Impedance (Note 3)	30mA p-p, typ.
Switching Frequency	260kHz, typ.
Recommended Fuse	(Note 2)

General Specifications

High Logic Level or Leave ON/OFF P in Open	3.0 VDC, min.
External Leakage Current Allowed for Logic High (Note 9)	10uA, max.
Input Diode Protection Voltage	50 VDC, max.
Low Logic Level or Tie ON/OFF Pin to -Input	1.0 VDC, max.
Sinking Current for Logic Low	500uA, max.
Open Circuit voltage at Primary ON/OFF Pin (10)
Positive Logic	2.3 VDC, typ.
Negative Logic	1.5 VDC, typ.
Output Resistance	3kΩ, typ.
Idle Current (Module is OFF)	8mA DC, typ.
Turn-on Time to 1% Error	60ms, typ.
Positive Logic Option	High - Module ON; Low - Module OFF
Negative Logic Option	High - Module OFF; Low - Module ON
Efficiency	See Chart Above

Physical Specifications

Size (Inches)	2.4” x 2.28” x 0.55”
Size (mm)	60.96 x 57.91 x 13.97mm
Weight (g)	114g
Weight (oz)	4.6 oz

Output Specifications

Output Voltage	See Chart Above
Output Amps	See Chart Above
Output Set Point (Vo, set)	±1%, max.
Turn On Overshoot	0%, typ.
Temperature Coefficient	3.3V: 0.01%/°C max.; 5V-24V: 0.005%/°C max.
Ripple and Noise (Note 8)	See Chart Above)
Load Current (Note 4)
Load Transient Overshoot (Note 7)	3%, typ.
Load Transient Recovery Time (Note 6)	200uSec, typ.
Load Regulation (Note5) Min-Max Load	0.02%, typ; 0.2%, max.
Line Regulation (Vin = Min-Max)	0.01%, typ; 0.1%, max.
Overvoltage Protection (OVP) Threshold OVP Type - Nonlatching; Open Loop Overvoltage Clamp	115%, min; 135%, max.
Output Current Limit (V out = 90% of V out-nom)	120% typ.
Output Short circuit Current (Vout = 0.25V)	140% typ., 150% max.

Environmental Specifications

Baseplate Operating Temperature	-40 to +100°C
Storage Temperature	-40 to +120°C
Thermal Impedance (Note 11)	7°C/W typ.
Thermal Shutdown Baseplate Temperature (Auto Restart)	110°C, typ.
MTBF	>1Mhrs.

Notes

1. Refer to the Astrodyne Application Notes for the definition of terms, measurement circuits, and other information.

2. Refer to the Astrodyne Application Notes for information on fusing. For inrush current, refer to the specifications above.

3. 33uF capacitor connected to two "Input" pin.s Then place current sensor in series with 12uH industor between 33uF and the source. The reflected ripple current is measured over 5Hz to 20MHz bandwidth (current sensor is located between the converter input pin and the 12uH inductor)..

4. Optimum performance is obtained when this power supply is operated within the minimum to maximum load specifications. No damage to module will occur when the output is operated at less than minimum load, but the output voltage may contain a low frequency component that may exceed output noise specifications.

5. Load regulation is defined as the output voltage change when changing load current from maximum to minimum. The voltage is measured at the output pin.

6. Load Transient Recovery Time is defined as the time for the output to settle from a 50 to 75% or 25% step load change to a 1% error band of output voltage (rise time of step = 2uSec).

7. Load Transient Overshoot is defined as the peak overshoot during a transient as defined in the Note 6 above.

8. Noise is measured per the Astrodyne Application Notes. Output noise is measured with a 10uF tantalum capacitor in parallel with a 0.1uF ceramic capacitor connected across the output to CMN. Measurement bandwidth is 0-20MHz.

9. When an external On/Off switch is used, such as open collector switch, logic high requires the switch to be high-impedance. Switch leakage currents greater than 20uA may be sufficient to trigger the On/Off to the logic-low state.

10. Most switches would be suitable for logic On/Off control, in case there is a problem, you can make following estimation and then leave some margin.

When open collector is used for logic high, "Open circuit Voltage at On/Off Pin", "Output Resistance" and "External Leakage Current Allowed for Logic High" are used to estimate the high impedance requirement of open collector.

When switch is used for logic low, "Open Circuit voltage at On/Off Pin", "Output Resistance" and "Low Logic Level" are used to estimate the low impedance requirement of switch.

11. Thermal impedance is tested with the converter mounted vertically and facing another printed circuit board 1/2 inch away. if converter is mounted horizontally with no obstructions, thermal impedance is approximately 10°C/W.

12. Water Washability - These DC/DC converters are designed to withstand most solder/wash processes. Careful attention should be used when assessing the applicability in your specific manufacturing process. converters are not hermetically sealed.

13. Torque fasteners into threaded mounting inserts at 12in. lbs. or less. Greater torque may result in damage to unit and void the warranty.

14. Input imedance on these units needs to be kept to a minimum. The 9-36Vdc DC units need a maximum input imedance of 0.2 Ohms and the 18-75Vdc DC units need a maximum input impedance of 0.8 Ohms. In order to support this requirement, the 9-36Vdc Dc units need 25uF of capacitance (low ESR) for every 1.0uH of inductance between the power source and the DC/DC converter. The 18-75Vdc DC units need 1.7uF of capacitance (low ESR) for every 1.0uH of inductance between the power source and the DC/DC converter. Inductance includes all sources and should take into account input power lines.

15. RoHS Compliance:

See Astrodyne Website www.astrodyne.com for the complete RoHS Compliance statement and Application Notes.

All specifications are typical at nominal input, full load, and 25°C unless otherwise noted.