Datasheet

LT3751
30
3751fc
–I
VOUT2
, I
VOUT3
** (mA)
–V
OUT2
, V
OUT3
(V)
18
16
14
20
3751 TA07b
V
IN
= 24V
V
IN
= 12V
V
IN
= 5V
1 10 100 1000
**SOURCE/SINK IDENTICAL CURRENTS FROM BOTH V
OUT2
AND V
OUT3
, RESPECTIVELY
Wide Input Voltage Range, 15 Watt, Triple Output Voltage Regulator
Typical applicaTions
DONE
FAULT
UVLO1
OVLO1
UVLO2
OVLO2
V
CC
CHARGE
CLAMP
RDCM
RV
OUT
HVGATE
LVGATE
FB
CSP
CSN
RV
TRANS
D1
T1
2:1:3:3
(P1:S1:S2:S3)
V
OUT3
+15V
V
IN
5V TO 24V
V
CC
3751 TA07a
LT3751
GND RBG
R5
25.5k
OFF ON
C4
470µF
C7
10µF
C1
10µF
•
•
C3
10µF
R12
4.99k
R7
25.5k
R6
11.5k
M1
R11
25mΩ
R10
100Ω
R8
2.21k
R9
309Ω
R4, 464k
R3, 66.5k
P1
S3
R2, 100k
R1, 100k
C1, C3: 25V X5R OR X7R CERAMIC
C2: 25V SANYO 25ME1000AX
C4, C5: 35V SANYO 35ME470AX
C6: 10V KEMET T520D107M010ASE055
C7, C8: 16V CERAMIC, TDK C4532X7R1E106M
C9: 6.3V CERAMIC, TDK C4532X5R0J107M
D1, D2: CENTRAL SEMI CMSH2-60M
D3: CENTRAL SEM1 CMSH5-40
M1: FAIRCHILD FQD12N20L
R1 THRU R10, R12, R13: 0805 RESISTOR, 1%
R11: 1206 RESISTOR, 1%
T1: COILCRAFT HA3994-AL, 2:1:3:3 (P1:S1:S2:S3)
D2
V
OUT2
–15V
C5
470µF
C8
10µF
•
R13
4.99k
S2
D3
V
OUT1
+5V
C6
100µF
×2
C9
100µF
•
S1
+
+
+
C2
1000µF
×2
+
–I
VOUT2
, I
VOUT3
** (mA)
–V
OUT2
, V
OUT3
(V)
22
24
20
18
16
14
26
3751 TA07c
V
IN
= 24V
V
IN
= 12V
V
IN
= 5V
1 10 100 1000
–I
VOUT2
+ I
VOUT3
(mA)
0
EFFICIENCY (%)
80
85
75
70
400
200
600 800
65
60
90
3751 TA07d
V
IN
= 24V
V
IN
= 12V
V
IN
= 5V
Cross Regulation
(I
VOUT1
= 100mA)
Efficiency
(I
VOUT1
= 500mA)
Maximum Output Conditions
V
CC
(V)
P
OUT(MAX)
(W)
I
OUT(MAX)
*
(mA)
V
OUT1
V
OUT2
V
OUT3
5 6.5 750 300 300
12 10 1750 300 300
24 13 2500 300 300
*All other output currents set to 0mA
Cross Regulation
(I
VOUT1
= 500mA)