Linear Technology DC1877A Demo Manual

Description
Demonstration circuit 1877A is a 500mA output DC/DC
power supply featuring
4V to 76V input range. The LTC3630A operates in a high
efficiency Burst Mode
high and low side switches. The board provides jumper
selected output voltages of 1.8V, 3.3V, 5V and an option
for additional voltages. LTC3630A has internal soft-start
and a provision for increasing soft-start time.
Included on the board is an ON/OFF jumper that can
also be configured as a precision undervoltage lockout.
Additional pc pads are included for programming current
limit to optimize efficiency and for reducing output voltage
ripple and reducing component size. A terminal (FBO)
performance summary
Table 1. Specifications are at T
PARAMETER
Input Voltage Range
1.8V Output
3.3V Output
5V Output
Maximum Output Current
Typical Output Voltage Ripple
Typical Efficiency
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High Efficiency High Voltage 500mA
Synchronous Step-Down Converter
LTC 3630A (DFN package), with
®
operation and includes internal
®
= 25°C
A
CONDITION
(1.8V, 3.3V Outputs)
V
IN
V
IN
V
IN
V
IN
V
IN
DEMO MANUAL DC1877A
is available to allow multiple boards to be paralleled for
increasing output current.
Output voltage between 800mV and V
using optional resistors. (Higher voltage output capacitors
may be required.)
The LTC3630A data sheet gives a complete description of
the operation and application information. The data sheet
must be read in conjunction with this demo manual.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1877A
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
= 76V, I = 500mA
OUT
= 76V, I = 500mA
OUT
= 76V, I = 500mA
OUT
= 76V, V = 5V
OUT
= 76V, V = 5V
OUT
LTC3630AEDHC
can be programmed
IN
VALUE
4V to 76V
1.8V ±2%
3.3V ±2%
5V ±2%
500mA
84mV
P-P
(See Figure 3)
dc1877af
1