Texas Instruments PT3321A, PT3321C, PT3321N, PT3322A, PT3322C Datasheet

For assistance or to order, call	[phone]			Revised 5/19/99
P T 3 3 2 0		S e r i e s
			30 WATT ISOLATED	Application Notes
				Mechanical Outline
			DC/DC CONVERTER
				Product Selector Guide

SIPs

New	30W	Isolated

The PT3320 is a new series of highinput voltage, 30 Watt, isolated DC to DC converters housed in a unique vertical or horizontal 19-pin SIP package. The 36 to 75V input range allows easy integration into many distributed power applications which utilize 48V bus architectures.

The PT3320 series is available with output voltages from 2V to 15V. The output voltage is adjustable from 90 to

110% of nominal with the addition of an external resistor. Other easy to use features include an inhibit function and differential remote sense which automatically compensates for any voltage drop from the converter to the load. The PT3320 includes built in current limit, short circuit protection and overtemperature shutdown.

The PT3320 requires a 330µF output capacitor for proper operation.

Patent pending*

Standard Application																						Pin-Out Information
																						Pin	Function					Pin	Function
VO Adjust																						1	Do Not Use					10	-Vo
													+REMOTE SENSE
	+V					18					19											2	Inhibit					11	-Vo
	IN					7-9	PT3320					14-17			+VO						3		Do Not Use					12	-Vo
						2																4	-Vin					13	-Remote Sense
				+									C		+			LOAD			5		-Vin				14		+Vo
		C						4-6	13	10-12
				IN									OUT
																					6		-Vin				15		+Vo
	Inhibit					Q1									-VO							7	+Vin					16	+Vo
	-VIN												-REMOTE SENSE								8		+Vin				17		+Vo
				Cin		= Optional 100µF/100V electrolytic
				Cout = Required 330µF electrolytic																		9	+Vin					18	Vo Adjust
				Q1		= NFET																					19		+Remote Sense
Preliminary Specifications
	Characteristics																								PT3320 SERIES
	(Ta = 25°C unless noted)								Symbols						Conditions										Min		Typ			Max	Units
	Output Current								Io						Over Vin range						Vo = 3.3V				0.25		—			8.0	A
																					Vo = 5V				0.25		—			6.0	A
																					Vo = 12V				0.1		—			2.5	A
	On/Off Standby Current								Iin standby						Vin = 48V, Pin 1 = -Vin										—		8			16	mA
	Short Circuit Current								Isc						Vin = 48V										—		2xIomax			—	A
	Input Voltage Range								Vin						Over Io Range										36.0		48.0			75.0	V
	Output Voltage Tolerance								∆Vo						Over Vin Range										—		±1.0			—	%Vo
															TA= -40°C to +85°C
	Line Regulation								Regline						Over Vin range @ max Io										—		±0.5			—	%Vo
	Load Regulation								Regload						10% to 100% of Io max										—		±0.5			—	%Vo
	Vo Ripple/Noise								Vn						Vin=48V, Io=Io max, Vo>5V										—		1.0			—	%Vo
															Vin=48V, Io=Io max, Vo<5V										—		50			—	mVpp
	Transient Response								ttr						50% load change, 1A/µSec										—		100			—	µSec
															Vo over/undershoot, Vo>5V										—		3.0			—	%Vo
	Efficiency								η						Vin=48V, Io=6A, Vo=3.3V										—		80			—	%
															Vin=48V, Io=6A, Vo=5V										—		84			—	%
															Vin=48V, Io=2.5A, Vo=12V										—		85			—	%
	Switching Frequency								ƒo						Over Vin and Io						Vo<10V				600		750			900	kHz
																					Vo>10V				400		500			600	kHz
	Recommended Operating								Ta						Vin = 48V @ max Io										-40*		—			+85	°C
	Temperature Range														Airflow = 200 LFM
	Storage Temperature								Ts						—										-40		—			+125	°C
	Mechanical Shock								—						Per Mil-Std-883D, method 2002.3,										—		500			—	G’s
															1mS, half-sine, mounted to a fixture
	Mechanical Vibration								—						Per Mil-Std-883D, method 2007.2,										—		10			—	G’s
															20-2000Hz, soldered in a PC board
	Weight								—						—										—		40			—	grams
	Input/Output Isolation								—						—										1500		—			—	VDC
	Capacitance								—						—										—		1200			—	pF
	Resistance								—						—										10		—			—	MΩ
	Flammability									—					Materials meet UL 94V-0
	Inhibit (pin 2)								On**						Referenced to -Vin										2.5		—			15	VDC
									Off																0		—			0.8	VDC

*At temperatures below 0°C, the PT3320 series requires output capacitors with temperature stable dielectrics such as tantalum or Oscon.

** If pin 2 is left open, the PT3320 will operate when input power is applied.

Features

•30W Output Power

•Input Voltage Range: 36V to 75V

•1500 VDC Isolation

•Vo Inhibit

•Vo Adjust

•Differential Remote Sense

•Current Limit

•Short-Circuit Protection

•Over-Temperature Shutdown

•Undervoltage Lockout

•Flexibile SIP Package

•UL 1950, CSA 22.2 950 approval pending

•Meets EN60950

Ordering Information

PT3321¨ = 3.3V/8A PT3322¨ = 5.0V/6A PT3323¨ = 12.0V/2.5A PT3324¨ = 15.0V/2A PT3325¨ = 2.0V/8A PT3326¨ = 2.5V/8A PT3327¨ = 1.8V/8A PT3328¨ = 5.2V/6A

PT Series Suffix (PT1234X)

Case/Pin

Configuration

Vertical Through-Hole	N
Horizontal Through-Hole	A
Horizontal Surface Mount	C

(For dimensions and PC board layout, see Package Styles 840 and 850.)

* Note: This product is the subject of one or more patents. Other patents pending.

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

For assistance or to order, call [phone]

P T 3 3 2 0 S e r i e s

C H A R A C T E R I S T I C D A T A

PT3321, 3.3 VDC (See Note 1)

PT3322, 5.0 VDC (See Note 1)

Efficiency vs Output Current

	90
	80
(%)	70
Efficiency
	60
	50
	40
	0	2	4	6	8

Iout (A)

		Efficiency vs Output Current
		90
		80
Vin	(%)	70						Vin
36.0V								36.0V
	Efficiency
48.0V								48.0V
60.0V		60						60.0V
75.0V								75.0V
		50
		40
		0	1	2	3	4	5	6

Iout (A)

PT3323, 12.0 VDC (See Note 1)

	Efficiency vs Output Current
	90
	80
(%)	70					Vin
						36.0V
Efficiency
						48.0V
						60.0V
	60					75.0V
	50
	40
	0.0	0.5	1.0	1.5	2.0	2.5

Iout (A)

Ripple vs Output Current

Ripple vs Output Current

Ripple vs Output Current

40						50								160
														140
30						40								120
Ripple(mV)				Vin	Ripple(mV)	20							Ripple(mV)	60					Vin
				75.0V															75.0V
				36.0V		30						Vin		100					36.0V
20				48.0V								36.0V		80					48.0V
				60.0V								48.0V							60.0V
												60.0V
												75.0V
10						10								40
														20
0						0								0
0	2	4	6	8		0	1	2	3	4	5	6		0.0	0.5	1.0	1.5	2.0	2.5

Iout (A)

Iout (A)

Iout (A)

Power Dissipation vs Output Current

	8
	6
(Watts)					Vin
					36.0V
	4				48.0V
					60.0V
PD
					75.0V
	2
	0
	0	2	4	6	8

Iout (A)

Power Dissipation vs Output Current

	7
	6
	5						Vin
(Watts)
	4						36.0V
							48.0V
PD	3						60.0V
							75.0V
	2
	1
	0
	0	1	2	3	4	5	6

Iout (A)

Power Dissipation vs Output Current

	6
	5
	4					Vin
(Watts)						36.0V
	3					48.0V
						60.0V
PD	2					75.0V
	1
	0
	0.0	0.5	1.0	1.5	2.0	2.5

Iout (A)

	Safe Operating Area (@Vin=48V)
	90
(°C)	80
	70
Temperature
	50				120LFM
	60				Airflow
					Nat conv
Ambient					60LFM
					200LFM
	40
	30
	20
	0	2	4	6	8
			Iout (A)

	Safe Operating Area (@Vin=48V)
	90
(°C)	80
	70
Temperature							200LFM
	50
							Airflow
	60						Nat conv
							60LFM
Ambient							120LFM
	40
	30
	20
	0	1	2	3	4	5	6
				Iout (A)

	Safe Operating Area (@Vin=48V)
	90
(°C)	80
	70
Temperature						200LFM
	50
						Airflow
	60					Nat conv
						60LFM
Ambient						120LFM
	40
	30
	20
	0	0.5	1	1.5	2	2.5

Iout (A)

Note 1: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the DC-DC Converter.

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com