Performance Summary; Quick Start Procedure - Linear Technology DC1745A Demo Manual

DEMO MANUAL DC1745A

perForMAnce sUMMArY

Table 1. Pre-Designed Transformers for High Voltage Applications with LT3748
TRANSFORMER
PART NUMBER
750311715
750311771
10393-T029
750311715
750811048
750811050
7508110117
7508110313

qUick stArt proceDUre

IMPORTANT NOTE TO CUSTOMERS
HIGH VOLTAGES ARE PRESENTED ON THE DEMO CIRCUIT,
AND CAN LEAD TO LETHAL INJURIES TO HUMAN BODY.
ONLY QUALIFIED PERSONEL SHOULD OPERATE IT. IT IS
STRONGLY RECOMMENDED TO USE SAFETY GLASSES
AND AN ISOLATION TRANSFORMER.
Demonstration Circuit 1745A can be set up to evaluate
the performance of the LT3748 with high input voltages.
NOTE. IMPROPER COMPONENTS REPLACEMENT ON THE
DEMO CIRCUIT CAN CAUSE PERFORMANCE DETERIORA-
TIONS, CIRCUIT MALFUNCTION, PROPERTY DAMAGE,
AND EVEN LIFE-THREATHENING INJURIES. CONTACT
LINEAR TECHNOLOGY APPLICATIONS ENGINEERS FOR
PROPER COMPONENT REPLACEMENT.
A) HIGH DC VOLTAGE APPLICATIONS
Refer to Figure 1 for proper measurement equipment setup
for DC inputs applications. It is suggested that the DC power
supply be connected to the VIN and GND ports on the up-
per left of the demo circuit. Follow the procedure below.
1. With power off, connect the DC input power supply to
VIN and GND on the board (Refer to Figure 1).
2
Arrow.com. Arrow.com.
Downloaded from Downloaded from
MAGNETIC L L
PRI LEAK
CORE (µH) (nH)
EFD25 280 4000
EFD25 500 5000
EFD25 400 6500
EFD25 280 4000
EE16 1500 14000
EE16 1500 30000
EE16 650 20000
EE16 1400 30000
N R
PSA PRI
(N :N :N ) (mΩ)
P S A
10:1:1 300
6:1:1 450
7:1:1 300
10:1:1 300
4.4:1:0.5 2900
4:1:0.3 4900
9:1:2.45 2400
6:1:1 4900
NOTE. MAKE SURE THAT PROPER INPUT PORTS ARE
USED. For DC INPUT, USE V
THE UPPER LEFT SIDE OF THE DEMO CIRCUIT.
NOTE. Make sure to use DC power supply with right
voltage and current capability and current limit function.
2. Connect the load to the terminals V
the output terminals of the board. Apply 150mA load
to the output.
3. Turn on the power at the input. Increase the input volt-
age to minimum as specified in Performance Summary
Table (which is 100V for DC input).
NOTE. Make sure that the input voltage does not exceed
the maximum voltage specified in Performance Sum-
mary Table (which is 400V for DC input). Exceed this
limit might damage the demo circuit.
4. Check for the proper output voltages. The output should
be regulated at 15V (±5%).
NOTE. If there is no output, temporarily disconnect the
power supply. Make sure that the load is connected with
correct polarity. Make sure to connect the power source
to the correct input ports. If the output voltage is out
Figure 1. Demo Board Setup
TARGET APPLICATION
R
SEC
(mΩ) INPUT (V) OUTPUT
20 60 ~ 600 15V/2A
15 100 ~ 400 15V/3A
15 100 ~ 400 12V/3.5A
20 60 ~ 600 15V/2A
210 120 ~ 375 30V/0.3A
550 100 ~ 400 48V/0.2A
65 100 ~ 400 5V/2A
185 100 ~ 400 15V/0.6A
AND GND PORTS ON
IN
OUT
PEAK CURRENT
I (A)
SAT
2.5
2.5
2.2
2.5
0.65
0.65
0.88
0.54
+ –
and V on
OUT
dc1745afa