Datasheet

LT3751
28
3751fc
CHARGE
CLAMP
V
CC
DONE
FAULT
UVLO1
OVLO1
UVLO2
OVLO2
RDCM
RV
OUT
HVGATE
LVGATE
CSP
CSN
FB
RV
TRANS
T1*
1:3
D1F1, 1A
V
OUT
100V TO 500V
V
TRANS
100V TO
400VDC
V
CC
3751 TA05a
LT3751
GND RBG
R6, 625k
OFF ON
C3
47µF
C2
2.2µF
×5
C1
10µF
•
•
R8, 417k
R5, 20Ω
R7, 97.6k
M1**
R12
68mΩ
R9
67.3k
D2
+
+
C4
100µF
V
TRANS
V
CC
R2, 9M
R1, 1.5M
R4, 475k
R3, 154k
C1: 25V X5R OR X7R CERAMIC
C2: 630V X5R OR X7R CERAMIC
C3: 450V ILLINOIS CAP 476CKE450MQW
C4: 50V TO 500V ELECTROLYTIC
C5: TDK CKG57NX7R2J474M
C6: 6.3V X5R OR X7R CERAMIC
D1, D2: VISHAY US1M 1000V
F1: BUSSMANN PCB-1-R
M1: FAIRCHILD FQB4N80
R1, R2: 2 X 1206 RESISTORS IN SERIES, 1%
R3 THRU R5, R7, R9, R11: 0805 RESISTORS, 1%
R6, R8: 3 X 1206 RESISTORS IN SERIES, 1%
R10: 1206 RESISTOR(S), 1%
R12: IRC LR SERIES 1206 RESISTOR, 1%
T1: COILCRAFT HA4060-AL
* T1 REQUIRES PROPER THERMAL MANAGEMENT
TO ACHIEVE DESIRED OUTPUT POWER LEVELS
** M1 REQUIRES PROPER HEAT SINK/THERMAL
DISSIPATION TO MEET MANUFACTURER’S
SPECIFICATIONS
*** DEPENDING ON DESIRED OUTPUT VOLTAGE,
R10 MUST BE SPLIT INTO MULTIPLE RESISTORS
TO MEET MANUFACTURER’S VOLTAGE SPECIFICATION
TO
MICRO
V
CC
10V TO
24V
C5
0.47µF
R11
R10***
DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
C6
10nF
OUTPUT CURRENT (mA)
0
40
EFFICIENCY (%)
50
60
70
80
90
25
50
3751 TA05b
75
V
IN
= 400V
V
IN
= 250V
V
IN
= 100V
INPUT VOLTAGE (V)
100
395
OUTPUT VOLTAGE (V)
396
397
398
200
300
3751 TA05c
400
I
OUT
= 25mA
I
OUT
= 50mA
I
OUT
= 10mA
10µs/DIV
3751 TA05d
V
IN
= 200V
V
OUT
= 400V
V
DRAIN
100V/DIV
I
PRI
2A/DIV
Efficiency Line Regulation
Steady-State Operation with
50mA Load Current
Typical applicaTions
High Input Voltage, High Output Voltage Regulator
Suggested Component Values
V
OUT
(V)
I
OUT(MAX)
(mA)
AT V
TRANS
= 100V,
1% V
OUT
DEFLECTION
I
OUT(MAX)
(mA)
AT V
TRANS
= 400V,
1% V
OUT
DEFLECTION
R10
(kΩ)
R11
(kΩ)
100 55 130 30.9 0.383
200 110 150 124 0.768
300 95 175 274 1.13
400 80 130 499 1.54
500 65 140 715 1.74