Datasheet

LT3751
27
3751fc
V
CC
DONE
FAULT
UVLO1
OVLO1
UVLO2
OVLO2
CHARGE
CLAMP
RDCM
RV
OUT
HVGATE
LVGATE
FB
CSP
CSN
RV
TRANS
T1*
1:3
D1F1, 1A
V
OUT
50V TO 500V
V
TRANS
100V TO
400VDC
V
CC
3751 TA04a
LT3751
GND RBG
R6
625k
OFF ON
C3
47µF
C2
2.2µF
×5
C1
10µF
•
•
R8
417k
R10
208k
R5
20Ω
R7, 96.2k
M1**
R13
68mΩ
R12
R9
67.3k
R11
32.1k
D2
+
+
C4
220µF
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
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, R9, R12: 0805 RESISTORS, 1%
R6, R10: 3 X 1206 RESISTORS IN SERIES, 0.1%
R7, R11: 0805 RESISTORS, 0.1%
R8: 3 X 1206 RESISTORS IN SERIES, 1%
R13: 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
FOR ANY OUTPUT VOLTAGE BETWEEN 50V
TO 500V, SET R12 GIVEN BY:
TO
MICRO
V
CC
10V TO 24V
C5
0.47µF
DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
4.7nF
Y-RATED
INPUT VOLTAGE (V)
100
V
OUT,TRIP
(V)
520
510
300
200
400
500
490
530
850
700
550
400
1000
3751 TA04b
V
OUT,TRIP
CHARGE TIME
CHARGE TIME (ms)
OUTPUT VOLTAGE (V)
50
EFFICIENCY (%)
85
90
95
80
75
250 450
150
350
70
65
100
3751 TA04c
V
IN
= 100V
V
IN
= 250V
V
IN
= 400V
100ms/DIV
3751 TA04d
V
OUT
= 500V
V
TRANS
= 300V
V
OUT
= 12V
AVERAGE
INPUT
CURRENT
200mA/DIV
CHARGE
10V/DIV
V
OUT
100V/DIV
Output Trip Voltage
and Charge Time
(V
OUT
= 500V, C
OUT
= 220µF) Efficiency
Charging Waveform
1.6A High Input Voltage, Isolated Capacitor Charger
Typical applicaTions
R12 =
0.98
V
OUT,TRIP
3 • R10
+ 40µA • 2