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DESCRIPTION
Demonstration Circuit 383B is multipurpose demon-
stration board featuring the LT1930 and LT1931. The
demo board offers three separate DC/DC converters.
The Boost circuit is designed to convert 5V input to
12V output at 300mA maximum load. The SEPIC cir-
cuit generates constant 12V/300mA output with
10V~16V variable input. The Inverter circuit is de-
signed for applications requiring negative 12V/350mA
from a positive 12V input. All three circuits are de-
signed to demonstrate the advantages of the 1.2MHz
switching frequency, the internal 36V/1A switch, wide
input voltage range and small circuit size. These cir-
cuits are intended for space-conscious applications
such as digital cameras, cellular phones, palmtop
computers and LCD displays. The 1.2MHz switching
Table 1.
Performance Summary SPECIFICATIONS ARE AT TA = 25°C
SYMBOL
PARAMETER FOR BOOST CONVERTER
V
Input Supply Range
IN
V
Output Voltage Accuracy
OUT
Ripple
Fs
Switching Frequency
SYMBOL
PARAMETER FOR SEPIC CONVERTER
V
Input Supply Range
IN
V
Output Voltage Accuracy
OUT
Ripple
Fs
Switching Frequency
SYMBOL
PARAMETER FOR INVERTING CONVERTER
V
Input Supply Range
IN
V
Output Voltage Accuracy
OUT
Ripple
Fs
Switching Frequency
1.2MHz, SOT-23 DC/DC CONVERTER
frequency, 1A integrated switch, small circuit size,
and low component count makes the LT1930 and
LT1931 suitable for use in many other applications,
such as PC cards, miniature disk drives, xDSL power
supplies, flash memory products and local 5V or 12V
supplies. The LT1930/LT1931 datasheets give complete
descriptions of the parts, their operation and application
information. The datasheets must be read in conjunction
with this quick start guide for working on or modifying
any circuit on the demo circuit 383B.
Design files for this circuit board are available. Call
the LTC factory.
LT is a trademark of Linear Technology Corporation
CONDITIONS
V
= 5V, I
= 300mA
IN
LOAD
V
= 5V, I
= 300mA
IN
LOAD
CONDITIONS
V
= 10V, I
= 300mA
IN
LOAD
V
=105V, I
= 300mA
IN
LOAD
CONDITIONS
V
= 12V, I
= 350mA
IN
LOAD
V
= 12V, I
= 350mA
IN
LOAD
DEMO CIRCUIT 383B
QUICK START GUIDE
LT1930ES5/LT1931ES5
MIN
TYP
MAX
5
11.76
12
12.24
50
1.2
MIN
TYP
MAX
10
16
11.76
12
12.24
50
1.2
MIN
TYP
MAX
12
-11.76
-12
-12.24
40
1.2
UNITS
V
V
mV
MHz
UNITS
V
V
mV
MHz
UNITS
V
V
mV
MHz
1
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Related Manuals for Linear Technology LT1930ES5
Summary of Contents for Linear Technology LT1930ES5
-
Page 1: Quick Start Guide
LTC factory. such as digital cameras, cellular phones, palmtop computers and LCD displays. The 1.2MHz switching LT is a trademark of Linear Technology Corporation Table 1. Performance Summary SPECIFICATIONS ARE AT TA = 25°C SYMBOL... -
Page 2: Quick Start Procedures
QUICK START PROCEDURES Refer to Figures 1–4 for proper measurement age will drop drastically. Return to normal operation equipment setup and follow the procedure outlined by removing the load. below: Quick Start for the SEPIC Circuit: The equipment setup for the three circuits is very similar. - Page 3 3. The current limit is tested by increasing the load When the current limit is exceeded, the output volt- past 500mA. The current limit will take effect when age will drop drastically. Return to normal operation the peak switch current becomes higher than ~1A. by removing the load.
- Page 4 Figure 2. Proper Measurement Equipment Setup for Sepic Converter...
- Page 5 Figure 3. Proper Measurement Equipment Setup for Inverting Converter Figure 4. Proper Input/Output Ripple Measurement Technique...
- Page 7 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC383B...
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