Datel 20A manual Performance/Functional Specifications

2 0 A , S I N G L E O U T P U T D C / D C C O N V E R T E R S USQ Models

Performance/Functional Specifications

Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. (1)

	Input
Input Voltage Range:
D24 Models	18-36 Volts (24V nominal)
D48 Models	36-75 Volts (48V nominal)
Overvoltage Shutdown	None (3)
Start-Up Threshold: (4)
D24 Models	15.5-18 Volts (16.5V typical)
D48 Models	28.5-32 Volts (30V typical)
Undervoltage Shutdown: (4)
D24 Models	14.5-16.5 Volts (15.5V typical)
D48 Models	26.5-29.5 Volts (28.3V typical)
Input Current:
Normal Operating Conditions	See Ordering Guide
Inrush Transient	0.05A2 sec maximum
Standby Mode:
Off, UV, Thermal Shutdown	3mA
Input Reflected Ripple Current (5)	5mAp-p
Internal Input Filter Type:
D24 Models	Pi (0.01µF - 1.5µH - 3.3µF)
D48 Models	Pi (0.01µF - 4.7µH - 3.3µF)
Reverse-Polarity Protection (3)	1 minute duration, 5A maximum
Remote On/Off Control (Pin 2): (6)
Positive Logic ("P" Suffix Models)	On = open, open collector or
	2.5-5V applied. IIN = 150µA max.
	Off = pulled low to 0-0.8V IIN = 800µA max.
Negative Logic ("N" Suffix Models)	On = pulled low to 0-0.8V IIN = 800µA max.
	Off = open, open collector or
	2.5-5V applied. IIN = 150µA max.

	Output
Minimum Loading	No load
Maximum Capacitive Loading (7)	25,000µF
VOUT Accuracy (Full Load):
Initial	±1% maximum
Temperature Coefficient	±0.02% per °C
Extreme (8)	±3%
VOUT Trim Range (9)	+10%, –20%
Remote Sense Compensation (4)	+10%
Ripple/Noise (20MHz BW)	See Ordering Guide
Line/Load Regulation	See Ordering Guide
Efficiency	See Ordering Guide
Isolation Voltage:
Input-to-Output	1500Vdc minimum
Input-to-Case	1500Vdc minimum
Output-to-Case	1500Vdc minimum
Isolation Resistance	100MΩ
Isolation Capacitance	650pF
Current Limit Inception (90% VOUT) (10)
1.2VOUT	22-30 Amps (26A typical)
1.5, 1.8, 2.5, 3.3, 5VOUT	22-29 Amps (26A typical)
12VOUT	9.2-10.5 Amps (9.9A typical)
15VOUT	7.6-8.9 Amps (8.25A typical)
18VOUT	6-7.75 Amps (6.5A typical)
24VOUT	4.8-6 Amps (5.5A typical)
Short Circuit: (4)
Current	Hiccup
Duration	Continuous

Output (Continued)
Overvoltage Protection: (4)	Magnetic feedback
1.5VOUT	2.2 Volts
1.8VOUT	2.7 Volts
2.5VOUT	3.8 Volts
3.3VOUT	4.9 Volts
5VOUT	6.4 Volts
12VOUT	15 Volts
15VOUT	20 Volts
18VOUT	22.5 Volts
24VOUT	30 Volts
Dynamic Characteristics
Dynamic Load Response (11)	See Dynamic Load Response
	under Technical Notes
Start-Up Time: (4) (12)
VIN to VOUT	5msec typical, 8msec maximum
On/Off to VOUT	5msec typical, 8msec maximum
Switching Frequency	(11)
Environmental
Calculated MTBF: (13)	>2.5 million hours
Operating Temperature (Ambient): (4) (14)
Without Derating	Model and air flow dependent
With Derating	To +110°C (baseplate)
Baseplate Temperature: (4) (14)
Maximum Allowable	+110°C
Thermal Shutdown	+115-122°C, +118°C typical.
Physical
Dimensions	1.45" x 2.28" x 0.40" (36.8 x 57.9 x 10.2mm)
Case Material	Cast aluminum
Baseplate Material	Aluminum
Shielding	Neither the aluminum case nor baseplate
	are connected to a package pin
Pin Material	Brass, solder coated
Weight:	1.52 ounces (43 grams)
Primary-to-Secondary Insulation Level	Basic

(1)All models are tested and specified with external output capacitors (1µF ceramic in parallel with 10µF tantalum), unless otherwise noted. These converters have no minimum-load require ments and will effectively regulate under no-load conditions.

(2)Contact DATEL for input voltage ranges (18-36V, 24V nominal) other than those listed.

(3)See Absolute Maximum Ratings for allowable input voltages.

(4)See Technical Notes/Performance Curves for additional explanations and details.

(5)Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33µF input capacitor and a simulated source impedance of 220µF and 12µH. See I/O Filtering, Input Ripple Current and Output Noise for details. The 24V input models can benefit by increasing the 33µF external input capacitance to 100µF, if the application has a high source impedance.

(6)The On/Off Control is designed to be driven with open-collector (or equivalent) logic or the application of appropriate voltages (referenced to –Input (pin 1)). See Remote On/Off Control for more details.

(7)USQ Series DC/DC converters are unconditionally stable, including start-up and short-circuit- shutdown situations, with capacitive loads up to 25,000µF (470µF for 12V, 15V, 18V and 24V models at full load).

(8)Extreme Accuracy refers to the accuracy of either trimmed or untrimmed output voltages over all normal operating ranges and combinations of input voltage, output load and temperature.

(9)See Output Trimming for detailed trim equations.

(10)The Current-Limit Inception point is the output current level at which the USQ’s power-limiting circuitry drops the output voltage 10% from its initial value. See Output Current Limiting and Short-Circuit Protection for more details.

(11)See Dynamic Load Response under Technical Notes for detailed results including switching frequencies. DATEL has performed extensive evaluations of Dynamic Load Response. In addi tion to the 10µF 1µF external capacitors, specifications are also given for 220µF 1µF external output capacitors for quick comparison purposes.

(12)For the Start-Up Time specifications, output settling is defined by the output voltage having reached ±1% of its final value.

(13)MTBF’s are calculated using Telcordia (Bellcore) Method 1 Case 3, ground fixed conditions, +40°C case temperature, and full-load conditions. Contact DATEL for demonstrated life-test data.

(14)All models are fully operational and meet published specifications, including "cold start," at –40°C.

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