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.
Ref.
number
T1 (SM)
T1 (PC)
T2 (SM)
T2 (PC)
T3 (PC)
T4 (PC)
Part
number
Q4435-BL
Q4434-BL
Q4436-BL
Q4337-BL
Volt-time
Input Inductance Inductance product Leakage
DCR (Ohms)
voltage at 0 Adc
at
I
pk
max
Inductance
1
(V)
±15% (µH) min (µH) (Vµsec) max (µH)
pri
sec
4–6
4–6
4–6
4–6
22
22
22
22
85
85
19.0
19.8
17.6
19.8
76.5
76.5
166.5
162.0
166.5
162.0
364.5
364.5
0.7
2.0
0.5
2.0
3.5
3.5
0.020
0.028
0.025
0.030
0.150
0.145
0.025
0.028
0.23 (10-11)
0.25 (9-8)
0.32 (8-7)
0.32 (6-5)
0.011 (10-9)
0.011 (7-6)
0.20 (10-9)
0.20 (7-6)
0.03 (4-5)
0.035 (10-11)
0.30 (9-8)
0.32 (4-5)
0.039 (8-7)
0.58 (6-5)
0.60 (3-4)
0.15 (10-11)
0.15 (9-8)
0.20 (8-7)
0.24 (5-6)
0.065
0.042
Turns ratio
pri : sec
1:1
1:1
1 : 2.5
1 : 2.5
1 : 2.5
1 : 2.5
1 : 0.8
1 : 0.8
1 : 0.8
1 : 0.8
1 : 0.35
1 : 0.5
1 : 1.167
1 : 1.167
1 : 0.5
1 : 1.167
1 : 1.167
1 : 1.2
1 : 1.2
1 : 1.2
1 : 1.2
1 :1
1:1
Output
5 V, 1.6 A
5 V, 1.6 A
12 V, 0.35 A
12 V, 0.35 A
12 V, 0.35 A
12 V, 0.35 A
12 V, 1.4 A
12 V, 1.4 A
12 V, 0.75 A
12 V, 0.75 A
5 V, 3.0 A
5 V, 1.8 A
12 V, 0.25 A
12 V, 0.25 A
5 V, 1.8 A
12 V, 0.25 A
12 V, 0.25 A
12 V, 0.63 A
12 V, 0.63 A
12 V, 0.63 A
12 V, 0.63 A
5 V, 0.9 A
5 V, 0.9 A
Ipk
2
(A)
4.85
5.0
5.0
5.0
3.0
3.0
Q4343-BL 18 – 36
Q4344-BL 18 – 36
T5 (SM)
Q4437-BL 18 – 36
55
47.3
299.7
2.0
0.110
3.0
T5 (PC)
Q4338-BL 18 – 36
66
59.4
499.5
3.5
0.090
3.0
T6 (SM)
T6 (PC)
T7 (SM)
T7 (PC)
Q4438-BL 18 – 36
Q4339-BL 18 – 36
S6057-AL
S6000-AL
4–6
4–6
65
66
47
47
57.0
59.4
40.0
40.0
299.7
499.5
233.1
212.6
3.0
3.0
2.0
2.0
0.065
0.090
0.065
0.065
3.0
3.0
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.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Core material
Ferrite
Ambient temperature
–40°C to +85°C
Weight
Q4337-BL:
Q4338-BL:
Q4339-BL:
Q4343-BL:
Q4344-BL:
Q4434-BL:
11.4 g
11.5 g
11.6 g
25.1 g
23.1 g
11.5 g
Q4435-BL:
Q4436-BL:
Q4437-BL:
Q4438-BL:
S6000-AL:
S6057-AL:
9.0 g
8.7 g
8.2 g
8.6 g
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.
Document 183-1
Revised 10/31/08
© Coilcraft, Inc. 2009
COILCRAFT [ Coilcraft lnc. ]
