Document 183-1
Magnetics for LM258X Flyback Regulator
These standard flyback regulator transformers are de-
signed for use with National Semiconductor LM2585,
LM2586, LM2587 and LM2588 SIMPLE SWITCHER®
switching regulators.
They are available in surface mount and through hole
configurations. All feature 500 V isolation between wind-
ings and a variety of available turns ratios.
Volt-time
Input Inductance Inductance product Leakage
DCR (Ohms)
pri sec
Ref.
Part
voltage at 0 Adc
at Ipk
max
Inductance1
Turns ratio
pri : sec
Ipk2
number number
(V) ±15%(µH) min (µH) (Vµsec) max (µH)
Output
5 V, 1.6 A
5 V, 1.6 A
(A)
T1 (SM) Q4435-BL 4 – 6
T1 (PC) Q4434-BL 4 – 6
T2 (SM) Q4436-BL 4 – 6
22
22
22
19.0
19.8
17.6
166.5
162.0
166.5
0.7
2.0
0.5
0.020
0.028
0.025
0.025
0.028
1:1
1:1
4.85
5.0
0.23(10-11)
0.25 (9-8)
1 : 2.5
1 : 2.5
12 V, 0.35 A 5.0
12 V, 0.35 A
T2 (PC) Q4337-BL 4 – 6
T3 (PC) Q4343-BL 18 – 36
T4 (PC) Q4344-BL 18 – 36
22
85
85
19.8
76.5
76.5
162.0
364.5
364.5
2.0
3.5
3.5
0.030
0.150
0.145
0.32 (8-7)
0.32 (6-5)
1 : 2.5
1 : 2.5
12 V, 0.35 A 5.0
12 V, 0.35 A
0.011(10-9)
0.011(7-6)
1 : 0.8
1 : 0.8
12 V, 1.4 A
12 V, 1.4 A
3.0
0.20(10-9)
0.20 (7-6)
0.03 (4-5)
1 : 0.8
1 : 0.8
1 : 0.35
12 V, 0.75 A 3.0
12 V, 0.75 A
5 V, 3.0 A
T5 (SM) Q4437-BL 18 – 36
T5 (PC) Q4338-BL 18 – 36
55
66
47.3
59.4
299.7
499.5
2.0
3.5
0.110
0.090
0.035(10-11) 1 : 0.5
5 V, 1.8 A
3.0
3.0
0.30 (9-8)
0.32 (4-5)
1 : 1.167 12 V, 0.25 A
1 : 1.167 12 V, 0.25 A
0.039(8-7)
0.58 (6-5)
0.60 (3-4)
1 : 0.5
1 : 1.167 12 V, 0.25 A
1 : 1.167 12 V, 0.25 A
5 V, 1.8 A
T6 (SM) Q4438-BL 18 – 36
T6 (PC) Q4339-BL 18 – 36
65
66
57.0
59.4
299.7
499.5
3.0
3.0
0.065
0.090
0.15(10-11)
0.15 (9-8)
1 : 1.2
1 : 1.2
12 V, 0.63 A 3.0
12 V, 0.63 A
0.20 (8-7)
0.24 (5-6)
1 : 1.2
1 : 1.2
12 V, 0.63 A 3.0
12 V, 0.63 A
T7 (SM) S6057-AL 4 – 6
T7 (PC) S6000-AL 4 – 6
47
47
40.0
40.0
233.1
212.6
2.0
2.0
0.065
0.065
0.065
0.042
1 :1
1 : 1
5 V, 0.9 A
5 V, 0.9 A
3.0
3.0
1. Leakage inductance measured across the primary at 0.10 Vrms, 100 kHz.
2. DC current at which the primary inductance is measured.
3. Electrical specifications at 25° C.
Core material Ferrite
Ambient temperature –40°C to +85°C
Weight
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Q4435-BL: 9.0 g
Q4337-BL: 11.4 g
Q4338-BL: 11.5 g
Q4339-BL: 11.6 g
Q4343-BL: 25.1 g
Q4344-BL: 23.1 g
Q4434-BL: 11.5 g
Q4436-BL: 8.7 g
Q4437-BL: 8.2 g
Q4438-BL: 8.6 g
S6000-AL:
S6057-AL:
10.6 g
8.2 g
Storage temperature Component: –40°C to +85°C.
Packaging: –40°C to +80°C
Resistance to soldering heat (SM parts) Max three 40 second
reflows at +260°C, parts cooled to room temperature between cycles
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
Mean Time Between Failures (MTBF) 26,315,789 hours
PCB washing Only pure water or alcohol recommended
Specifications subject to change without notice.
Please check our website for latest information.
Document183-1 Revised10/31/08
© Coilcraft, Inc. 2009