LT3751EUFD#PBF Linear Technology, LT3751EUFD#PBF Datasheet - Page 28

• Manufacturer Part Number: LT3751EUFD#PBF
• Description: IC CAPACITOR CHRG 20-QFN
• Manufacturer: Linear Technology

Specifications of LT3751EUFD#PBF

• Applications: Photoflash Capacitor Charger
• Current - Supply: 5.5mA
• Voltage - Supply: 4.75 V ~ 24 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-QFN
• Primary Input Voltage: 24V
• No. Of Outputs: 1
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 1 - Unlimited
• Supply Voltage Range: 4.75V To 24V
• Termination Type: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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