835-00971 datasheet, PDF - EEWORLD Datasheet

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835-00971: DescriptionSMPS Transformer, 7W; CategoryPower management transformer; File Size93KB，2 Pages; ManufacturerElec & Eltek; Websitehttp://www.eleceltek.com

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835-00971 Overview

SMPS Transformer, 7W

835-00971 Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Elec & Eltek
Reach Compliance Code	unknown
ECCN code	EAR99
Other features	BREADTH & HEIGHT DIM. INCLUDES TERMINALS ALSO; FLY BACK; TURNS RATIO IS 1:0.19
high	11.43 mm
Maximum input voltage	57 V
Minimum input voltage	33 V
length	12.7 mm
Manufacturer's serial number	835-00971
Installation features	SURFACE MOUNT
Number of primary windings	1
Number of secondary windings	2
Maximum operating frequency	200 kHz
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Output voltage 1	3.3 V
method of packing	TAPE & REEL
physical size	L12.7XB15.24XH11.43 (mm)
rated power	7 W
Primary inductance	155 µH
surface mount	YES
Transformer type	SMPS TRANSFORMER
width	15.24 mm

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E & E Magnetic Products Limited

CHEMATICS

Flyback transformers designed for PoE (IEEE802.3af)

powered devices with up to 7 Watts

POWER TRANSFORMER

Flyback Transformer for PoE

For National Semiconductor LM5070 PoE Interface

Designed for 250kHz switching frequency (continuous mode)

with input of 33 - 57V

Low Leakage Inductance

Hipot voltage: 1500Vrms

Operating temperature -40°C to +85°C.

RoHS compliant version is available

Custom design is also available

LECTRICAL

PECIFICATION @

25°C

Part

Number

835-00971

835-00972

835-00973

RoHS

Part

Number

835-00971F

835-00972F

835-00973F

Turns Ratio

Pri : Sec

1 : 0.19

1 : 0.262

1 : 0.667

Pri : Bias

1 : 0.667

Inductance

at 0A

(uH ± 10%)

155

Inductance Leakage

at Ipk

Inductance

(uH Min)

(nH Max)

139.5

4.00

3.60

3.25

DCR

(mOhm Max)

Pri

414

Bias

822

Sec

343

Ipk

(A)

Secondary

Output

0.65 Vout=3.3V,2.12A

0.65

Vout=5.0V,1.4A

Vout=12V,0.6A

Notes:

1. Inductance is measured at 10kHz, 0.1Vrms, 0Adc.

2. Peak primary current, Ipk, is drawn at minimum input voltage.

3. DCR for the secondary is per winding.

4. Leakage Inductance measured between pins 3 and 4 with all other pins shorted.

5. Turns ratio is with the secondary windings connected in parallel.

6. Output of the secondary is with the windings connected in parallel. Bias winding output is 12V, 20mA.

7.Operating temperature range: -40°

to +85°C. The part temperature (ambient temperature + temperature rise)

should not exceed the upper limit of the operating temperature under worst case operating conditions. Circuit design,

component placement, PWB trace size and thickness, airflow and other cooling provisions all affect the part

temperature. Part temperature should be verified in the end application.

2/F Block A, 94 Tokwawan Road, Kowloon, Hong Kong

Tel: (852) 2765 3888

Fax: (852) 2954 3304

PX228(01)

Revised in 07/08

835-00971 Related Products

	835-00971	835-00971F	835-00972	835-00972F	835-00973	835-00973F
Description	SMPS Transformer, 7W	SMPS Transformer, 7W, ROHS COMPLIANT	SMPS Transformer, 7W	SMPS Transformer, 7W, ROHS COMPLIANT	SMPS Transformer, 7W	SMPS Transformer, 7W, ROHS COMPLIANT
Is it lead-free?	Contains lead	Lead free	Contains lead	Lead free	Contains lead	Lead free
Is it Rohs certified?	incompatible	conform to	incompatible	conform to	incompatible	conform to
Maker	Elec & Eltek	Elec & Eltek	Elec & Eltek	Elec & Eltek	Elec & Eltek	Elec & Eltek
Reach Compliance Code	unknown	unknown	unknown	unknown	unknown	unknown
ECCN code	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
Other features	BREADTH & HEIGHT DIM. INCLUDES TERMINALS ALSO; FLY BACK; TURNS RATIO IS 1:0.19	BREADTH & HEIGHT DIM. INCLUDES TERMINALS ALSO; FLY BACK; TURNS RATIO IS 1:0.19	BREADTH & HEIGHT DIM. INCLUDES TERMINALS ALSO; FLY BACK; TURNS RATIO IS 1:0.19	BREADTH & HEIGHT DIM. INCLUDES TERMINALS ALSO; FLY BACK; TURNS RATIO IS 1:0.19	BREADTH & HEIGHT DIM. INCLUDES TERMINALS ALSO; FLY BACK; TURNS RATIO IS 1:0.19	BREADTH & HEIGHT DIM. INCLUDES TERMINALS ALSO; FLY BACK; TURNS RATIO IS 1:0.19
high	11.43 mm	11.43 mm	11.43 mm	11.43 mm	11.43 mm	11.43 mm
Maximum input voltage	57 V	57 V	57 V	57 V	57 V	57 V
Minimum input voltage	33 V	33 V	33 V	33 V	33 V	33 V
length	12.7 mm	12.7 mm	12.7 mm	12.7 mm	12.7 mm	12.7 mm
Manufacturer's serial number	835-00971	835-00971	835-00972	835-00972	835-00973	835-00973
Installation features	SURFACE MOUNT	SURFACE MOUNT	SURFACE MOUNT	SURFACE MOUNT	SURFACE MOUNT	SURFACE MOUNT
Number of primary windings	1	1	1	1	1	1
Number of secondary windings	2	2	2	2	2	2
Maximum operating frequency	200 kHz	200 kHz	200 kHz	200 kHz	200 kHz	200 kHz
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C
Output voltage 1	3.3 V	3.3 V	5 V	5 V	12 V	12 V
method of packing	TAPE & REEL	TAPE & REEL	TAPE & REEL	TAPE & REEL	TAPE & REEL	TAPE & REEL
physical size	L12.7XB15.24XH11.43 (mm)	L12.7XB15.24XH11.43 (mm)	L12.7XB15.24XH11.43 (mm)	L12.7XB15.24XH11.43 (mm)	L12.7XB15.24XH11.43 (mm)	L12.7XB15.24XH11.43 (mm)
rated power	7 W	7 W	7 W	7 W	7 W	7 W
Primary inductance	155 µH	155 µH	155 µH	155 µH	155 µH	155 µH
surface mount	YES	YES	YES	YES	YES	YES
Transformer type	SMPS TRANSFORMER	SMPS TRANSFORMER	SMPS TRANSFORMER	SMPS TRANSFORMER	SMPS TRANSFORMER	SMPS TRANSFORMER
width	15.24 mm	15.24 mm	15.24 mm	15.24 mm	15.24 mm	15.24 mm

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