4 Electrical Parameters

This section shows the electrical parameters of the SA50-28 Single Series device under the following conditions unless otherwise specified:


Parameter	Output	Conditions	Min	Nom	Max	Units
Input voltage
(Vin)	—	Note 2	20	28	40	V
Output voltage
(V_OUT)	28V	I_OUT = 100% rated load	27.73	28.00	28.27	V
	15V		14.85	15.00	15.15
	12V		11.88	12.00	12.12
	5V		5.05	5.10	5.15
	3.3V		3.27	3.30	3.33
Output Voltage Adjust
(V_ADJ)	—	—	5	—	—	%
Output power
(P_OUT)	28V	Note 13 In all cases Output power must be kept within P_out rating.	0	—	50	W
	15V				50
	12V				50
	5V				50
	3.3V				33
Output current
(I_OUT)	28V	—	0	—	1.8	A
	15V				3.3
	12V				4.2
	5V				10
	3.3V				10
Line regulation
(VR_LINE)	28V	V_IN = 20 V, 28 V, 40 V I_OUT = 10%, 50%, 100% rated Note 12	-56	—	56	mV
	15V		-30		30
	12V		-24		24
	5V		-10		10
	3.3V		-10		10
Load regulation
(VR_LOAD)	28V	V_IN = 20 V, 28 V, 40 V I_OUT = 10%, 50%, 100% rated Note 11	-280	—	280	mV
	15V		-150		150
	12V		-120		120
	5V		̶ 50		50
	3.3V		-50		50
Input current
(I_IN)	—	I_OUT=0, pin3 open	—	100	150	mA
(I_IN)	—	Pin 3 shorted to pin 2	—	2	5	mA
Output ripple
(V_RIP)	28V	V_IN = 20 V, 28 V, 40 V I_OUT = 100% rated, Note 4	—	100	280	mV p-p
	15V		—	75	150
	12V		—	60	120
	5V		—	25	50
	3.3V		—	25	50
Switching frequency
(FS)	—	Sync input (pin 4) open	200	220	240	kHz
Efficiency
(EFF)	28V	I_OUT = 100% rated load	78	82	—	%
	15V		77	82	—
	12V		76	82	—
	5V		71	81	—
	3.3V		62	79	—
Inhibit input
Inhibit input: ON Threshold	—	Note 1	4.5	—	—	V
Inhibit input: OFF drive current (sink)	—	Note 1	1000	—	—	µA
Inhibit input: OFF Threshold	—	Note 1	—	—	2	V
Current limit point
(% rated output)	—	When V_OUT = 90% of nominal set point	105	—	145	%
Synchronization
frequency range	—	The external clock on sync input (pin 4)	500	—	600	kHz
Synchronization pulse-high level	—	Note 1	4.0	—	10.0	V
Synchronization pulse-low level	—	Note 1	-0.5	—	0.5	V
Synchronization pulse-transition rate	—	Note 1	200	—	—	V/µs
Synchronization pulse-duty cycle	—	Note 1	10	—	80	%
Power dissipation, load fault
(PD)	—	Short circuit, overload Note 6	—	—	24	W
Output response to step load changes
(V_TLD)	28V	(50% to/from 100%) rated load Note 7	-2200	—	2200	mV peak
	15V		-1200		1200
	12V		-900		900
	5V		-500		500
	3.3V		-300		300
Recovery time, step load changes
(T_TLD)	—	(50% to/from 100%) rated load Notes 7, 8	—	200	2000	µs
Output response to step line changes
(V_TLN)	28V	20V to/from 40V I_OUT = 100% rated load Note 9	-1000	—	1000	mV peak
	15V		-600		600
	12V		-480		480
	5V		-300		300
	3.3V		-300		300
Recovery time, step line changes
(T_TLN)	—	20V to/from 40V I_OUT = 100% rated load Notes 8, 9	—	200	2000	µs
Turn-on response: overshoot
(V_OS) (main)	28V	(0% to 100%) rated load Notes 3, 4, 10	—	—	2800	mV
	15V		—	—	1500
	12V		—	—	1200
	5V		—	—	500
	3.3V		—	—	500
Turn-on response: turn-on delay
(T_DLY)	—	Note 10	0.1	—	10	ms
Capacitive load
(CL)	28V	Note 5	—	—	200	µF
	15V		—	—	350
	12V		—	—	450
	5V		—	—	1000
	3.3V		—	—	1000
Line rejection
—	—	DC to 50 kHz, I_OUT = 100% rated load	30	60	—	dB
Isolation
—	—	50V @25°C Input (1-3) to All (4-12) Sync (4-5) to All (1-3, 6-12) Chassis (6) to All (1-5, 7-12)	100	—	—	MΩ
Mass
—	—	Standard case style A, B	—	120	—	g
MTBF
—	—	MIL-HDBK-217F2, SF, 35°C	—	8.22x10⁶	—	hrs