2. Scope of application of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

High-reliability electronic system for ground ,vehicle ,radar , aviation and aerospace, etc

3. Description of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

HNDO5S3R3 is a high reliable, output voltage adjustable non-isolated DC to DC converters with BUCK circuit topology and pulse width modulation principle. The output sampling voltage is directly feedbacked to modulate the pulse width to achieve closed-loop control to meet the stability of the voltage output requirements. By changing the external resistance method to achieve the output voltage 0.8V-3.3V adjustable.. The series of products are made by thick-film hybrid integrated production process, metal sealed package. The design and manufacturing process of HNDO5S3R3 Series converters are in compliance with MIL-PRF-38534.

4.Technical Specifications of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

Table 2 Rated conditions and recommended operating conditions

Absolute Max. Rating
Input voltage：3V～5.5V Input voltage（Transient,1s）：6V Output Power：18.2W Storage temperature：-65℃～150℃	Mechanical Shock：1500g Lead solderable temperature：300℃（15s） Weight：13.5g

Table 3 Electrical characteristics

Parameter	Conditions	HNDO5S3R3		Unit
	（Unless otherwise specified，-55℃≤Tc≤125℃，	Q/HW21914-2012
	VIN=5V±0.15V）	Min	Max
Output voltage	VIN=3V～5.5V，IO=5A	0.8	2.5	V
	VIN=4V～5.5V，IO=5A	2.5	3.3
Output current	VIN=3V～5.5V	-	5	A
Output Ripple Voltage/mV	TA=25℃	-	35	mV
	IO=5A，Vo=3.3V
	BW =10kHz～2MHz
Load Regulation/mV	IO=0→5A，Vo=3.3V	-	40	mV
Efficiency/%	Vo=3.3V，Io=4A	93	-	%
Isolation/MΩ	Input to output or any pin to case(except pin 3)at 500V，Tc=25℃	100	-	MΩ
Inhibit voltage	TA=25℃，Vo=3.3V，IO=5A	0	0.8	V
Start-up Delay (ms)	VIN：0→5V，Vo=3.3V	-	10	ms
Start-up Overshoot(mV pK)	VIN：0→5V，Vo=3.3V	-	200	mV

5.Circuit block diagram of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

6. Typical Characteristic Curve(Testing condition as per Tc=25℃，VIN=5V±0.15V, Vo=3.3V，full load. unless otherwise specified) of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

Fig 3 HNDO5S3R3 Efficiency curve


Fig 4 HNDO5S3R3 Load

Fig 5 HNDO5S3R3 Overshoot/Start-up Delay


Fig 6  MTBF Temperature Curve（HNDO5S3R3）
（Ground good condition is expected）

7.Pin Designations of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

Figure 7 Bottom View
Table 4 Pin Designation

Pin	Symbol	Designation
1	NC	NC
2	VIN	Input
3	GNDC	Case ground
4	VO	Output
5	GND	Common GND
6	VTR	Output Trimming
7	INH	Inhibit

8. Typical Connection Diagram of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

In fig 8，By adjusting the external resistor Rtr，can achieve different output voltage，Rtr and VO relationship is shown as follow：

Vo（V）	Rtr(kΩ) reference
3.3	3.3
2.6	6.55
2.5	7.25
0.8	NC

Fig 9 Inhibit Driver Circuit Diagram
In fig 9，By adjusting the external capacitor, can extended circuit start-up delay time.
(C=0.1μF, Delay time extension 3ms, Depending on the output situation)

In fig 10, By adjusting the parameters of inductance and capacity, can reduce the input ripple voltage.
（When L=4.7uH，C1=100uF ,C2=47 uF，Input ripple voltage is 100mV, Depending on the output situation）

9. Package Specifications of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

 

Fig 11 Bottom View

Fig 12 Side View

Table 5  Package Outline

Symbols	Unit/mm
	Minimum	Nominal	Maximum
A	-	-	7.36
Φb1	0.32	-	0.58
Φb2	0.87	-	1.13
D	-	-	25.14
E	-	-	20.66
e a	-	5.08	-
e1 a	-	12.70	-
e2 a	-	7.62	-
Z	2.62	-	3.22
L	5.40	-	-
a e, e1, e2 interchangeability dimensions are guaranteed by the manufacture and inspection of the enclosure，this specification is not required as an assessment.

Table 6  Case Materials

Case Model	Header	Header Plating	Cover	Cover Plating	Pin	Pin Plating	Sealing	Notes
UPP2520-07	Cold Rolled Steel（10#）	Ni	Iron-nickel alloy(4J42)	Ni	Copper –core Compound	Au	Compression

10.Ordering Information of HNDO5S3R3 High Reliability Point of Load DC to DC Converters (POL)

Application Notes:

☆  Both positive and negative terminals for power supply shall be correctly connected when power is applied so as to avoid permanent damage to the device.
☆  Testing position shall be the root of the pin of the device when the electrical characteristic is measured.
☆  The baseplate of the device shall be closely attached to the circuit board during device mounting so as to avoid the damage on pins. The shockproof actions shall be adopted when necessary.
☆  Pins shall not be bended to avoid the glass insulator cracking and case leaking.
☆  Pins at inhibit terminal shall be hung in the air during no operation.
☆  When ordering this device，the detail electrical specification shall be based on relevant standards. While data offered in this document shall be for reference only.