LT3574IMS#PBF Linear Technology, LT3574IMS#PBF Datasheet - Page 11

• Manufacturer Part Number: LT3574IMS#PBF
• Description: IC PWM FLYBCK ISO CM 16MSOP
• Manufacturer: Linear Technology
• Type: Flyback, Isolated, PWM - Current Moder

Specifications of LT3574IMS#PBF

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 60V
• Current - Output: 650mA
• Frequency - Switching: 40kHz ~ 1MHz
• Voltage - Input: 3 ~ 40 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: *
• Package / Case: 16-MSOP
• Voltage - Supply: 3 V ~ 40 V
• Frequency-max: 1MHz
• Duty Cycle: 52%
• Pwm Type: Current Mode
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

applications inForMation
TRANSFORMER DESIGN CONSIDERATIONS
Transformer specification and design is perhaps the most
critical part of successfully applying the LT3574. In addition
to the usual list of caveats dealing with high frequency
isolated power supply transformer design, the following
information should be carefully considered.
Table 5. Predesigned Transformers—Typical Specifications Unless Otherwise Noted
TRANSFORMER
PART NUMBER
PA3018NL
PA2626NL
PA2627NL
PA3019NL
PA3020NL
PA3021NL
750311304
750310564
750370040
750370041
750370047
750311307
750311308
L10-1022
12.70 × 10.67 × 9.14
12.70 × 10.67 × 9.14
15.24 × 13.1 × 11.45
12.70 × 10.67 × 9.14
12.70 × 10.67 × 9.14
12.70 × 10.67 × 9.14
15.24 × 13.3 × 11.43
15.24 × 13.3 × 11.43
15.24 × 13.3 × 11.43
15.24 × 13.3 × 11.43
9.14 × 9.78 × 10.54
9.14 × 9.78 × 10.54
13.35 × 10.8 × 9.14
9.52 × 9.52 × 4.95
SIZE (W × L × H)
mm
(µH)
L
100
100
50
30
50
50
60
50
50
63
30
50
30
30
PRI
L
LEAKAGE
2000
2090
(nH)
700
403
766
700
680
195
825
450
150
450
150
-
NP:NS:NB
2:1:0.33
1:1:0.33
2:1:0.33
1:1:0.33
4:1:1.5
4:1:1
3:1:1
3:1:1
3:1:1
3:1:1
3:1:1
3:1:1
3:1:1
1:1
Linear Technology has worked with several leading mag-
netic component manufacturers to produce pre-designed
flyback transformers for use with the LT3574. Table 5 shows
the details of several of these transformers.
0.142
(mΩ)
R
250
240
420
250
400
100
146
115
190
173
325
60
60
PRI
0.142
(mΩ)
R
12.5
12.5
200
200
104
480
32
66
44
72
17
50
26
SEC
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Würth Elektronik
Würth Elektronik
Würth Elektronik
Würth Elektronik
Würth Elektronik
Würth Elektronik
Würth Elektronik
BH Electronics
VENDOR
LT3574
APPLICATIONS
12V, 0.25A
15V, 0.15A
12V, 0.25A
15V, 0.15A
3.3V, 0.7A
3.3V, 0.7A
±5V, 0.5A
TARGET
5V, 0.5A
5V, 0.5A
5V, 0.5A
5V, 0.5A
5V, 0.5A
5V, 0.5A
5V, 0.1A

3574f