LTC3722-2_15 Datasheet, PDF (28/28 Pages) Linear Technology – Synchronous Dual Mode Phase Modulated Full Bridge Controllers

LTC3722-1/LTC3722-2
TYPICAL APPLICATION
LTC3722/LTC4440 420W, 36V-72V Input to 12V/35A Isolated Full Bridge Supply
L1, 1.3µHV^IN
51Ω, 2W
+V_IN
36V TO
72V
1µF
100V
1µF
100V
×4
D5
0.47µF
–V_IN
12V
D2
3
V_CC
1
A
LTC4440EMS8E
BOOST
IN
TG
6
7
GND GND TS
4
28
0.22µF
12V
D3
3
V_CC
1
C
Si7852DP
LTC4440EMS8E
IN
BOOST
TG
6
7
×2
GND GND TS
L2
4
28
150nH
0.22µF
100V
D4
0.47µF 51Ω
100V
2W
Si7852DP
×2
T1
5:5(105µH):1:1
4
11
• ¹⁰
2_{• 8}
•⁷
4
11
V_HIGH
L3
0.85µH
V_HIGH
D1
820pF
200V
15Ω
1.5W D6
13k
1/2W
+V_OUT
0.47µF
100V
–V_OUT
12V
B
Q1
Q3
0.47µF, 100V = TDK C3216X7R2A474M
1µF, 100V = TDK C4532X7R2A105M
C1, C2: SANYO 16SP180M
C3: AVX TPSE686M020R0150
C4: MuRata DE2E3KH222MB3B
D1, D4, D5, D6: MURS120T3
D2, D3, D7, D8: BAS21
D9: MMBZ5226B
D10: MMBZ5240B
D11: BAT54
D12: MMBZ5231B
Si7852DP
×2
12V
D
Q2
Q4
0.02Ω
1.5W
1.10k
I_SNS
0.02Ω
1.5W
12V
C3 +
68µF
20V
100Ω
D9
3.3V
Si7852DP
×2
• ¹⁰
2_{• 8}
•⁷
T2
5:5(105µH):1:1
L4
1mH
6
•
Si7852DP
×4
+
Si7852DP
×4
D7
D8
1•
4.02k
4.02k
4.64k
1/4W
2.15k
4.64k
1/4W
2.15k
C1, C2
180µF
16V
×2
+V_OUT
12V
35A
1µF
–V_OUT
+V_OUT
1k
MMBT3904
L1: SUMIDA CDEP105-1R3MC-50
L2: PULSE PA0651
L3: PA1294.910
L4: COILCRAFT DO1608C-105
Q1, Q2: ZETEX FMMT619
Q3, Q4: ZETEX FMMT718
T1, T2: PULSE PA0526
T3: PULSE PA0785
V_IN
12V
20k
1/4W
150Ω
182k
30.1k
220pF
20k 220pF
4.99k
ABC D
11 9
21 20 19 17 15
10 _{SBUS ADLY PDLY}
OUTA OUTB OUTC OUTD OUTF
18 _VCC
LTC3722-1
12
UVLO _{VREF DPRG NC SYNC CT SPRG RLEB}
5V_REF
14 2 8 1
24 13 5
FB GND PGND
6 23 22
150k
5.1k
10k
MMBT3904
1µF 0.47µF
220pF ^180pF
33k
8.25k
T3
1(1.5mH):0.5
1
4
0.1µF
8
5
22Ω
I_{SNS 5VREF}
200k
16
OUTE
750Ω 7
3
CS
6
SS COMP
74
330pF
D11
2.2nF
100Ω
220pF
6
CSE⁺
SYCN
5
CSE^–
2 3 11 12
ME ME2 CSF⁺ CSF^–
LTC3901EGN
14 15 16
MF MF2 V_CC
1
PV_CC
30.1k
GND PGND GND2 PGND2 TIMER
8 4 10 13
7
1µF
330pF
470Ω
1/4W
+V_OUT
–V_OUT
330Ω
MOC207 ₁
5
2
100k
C4
2.2nF
2.7k
0.047µF
324
V⁺ COMP RTOP
1
LT1431
COLL
REF
8
D12
GNDF GNDS R_MID
5.1V
65 7
9.53k 10k
22nF
2.49k
100Ω
D10
10V
1µF
68nF
1M
250V
–V_OUT
372212 TA02
RELATED PARTS
PART NUMBER
DESCRIPTION
LTC3723-1/LTC3723-2 Synchronous Push-Pull and Full-Bridge Controllers
LTC3721-1
Non-Synchronous Push-Pull and Full-Bridge Controller
LTC3765/LTC3766 Isolated Synchronous Forward Controller Chip Set
LT1952/LT1952-1
Isolated Synchronous Forward Controllers
LTC3901
Secondary-Side Synchronous Driver for Full-Bridge and
Push-Pull Converters
LTC4440
High Voltage High Side MOSFET Driver
COMMENTS
High Efficiency with On-Chip MOSFET Drivers
Minimizes External Components, On-Chip MOSFET Drivers
Ideal for 24V or 48V Input Applications
Ideal for 24V or 48V Input Applications
Programmable Timeout, Reverse Inductor Current Sense
100V, 2.4A Pull-Up, 1.6Ω Pull-Down, SOT-23 and MSOP-8 Packages
28 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95_F0_o3_r5_m-_o7_r4_e1_in7_{formation www.linear.com/LTC3722}
[phone] ^● FAX: [phone] ^● www.linear.com/LTC3722
372212fb
LT 0213 REV B • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2009