Linear Technology DC2154A Demo Manual

DESCRIPTION
Demonstration circuit 2154A features the
buck-boost μModule regulator that accepts input volt-
®
ages lower, higher or the same as the output, but is also
highly efficient due to its four-switch architecture. The
output for DC2154A is 24V and the input voltage range
is 7V to 58V. The maximum output current is 3A and the
switching frequency is 525kHz.
DC2154A supports the adjustable and controllable features
of the LTM8056 including output voltage and current
regulation, switching frequency, RUN threshold, soft-start
period, synchronization and reverse inductor current in-
hibit. In most cases, adjustment is made by modifying the
appropriate resistor or capacitor component(s). DC2154A
provides output current monitoring and a clock output.
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage, V
IN
Maximum Input Voltage, V
IN
Maximum Output Current, I
OUT
Input Turn-On Voltage, V
IN
Input Turn-Off Voltage, V
IN
Output Voltage, V
OUT
Efficiency
Switching Frequency
Output Current Limit
LTM 8056, a
®
Specifications are at T
CONDITIONS
24V < V <58V, CTL = OPEN
IN
V =7V, CTL = OPEN
IN
R10 = 332k, R11 = 86.6k, V Rising
IN
R10 = 332k, R11 = 86.6k, V Falling
IN
100mA < I < 3A (See Figure 2), R2 = 5.23k,
OUT
R3 = 100k 1%, R4 = 0.015Ω
V =48V, I = 3A
IN OUT
R1 = 43.2k
R4 = 0.015Ω
DEMO MANUAL DC2154A
58V , 48V
IN
μModule Regulator
Input current monitoring and regulation requires the in-
stallation of a current sense resistor. The SVIN input for
controller power can be made a diode-OR of power V
and the output voltage to extend the operating range of
power V to lower voltages. There are places to mount
IN
optional components that add an LC input filter and also a
unity gain buffer to operate multiple DC2154As in parallel.
The LTM8056 data sheet must be read in conjunction with
this demo manual to properly use or modify DC2154A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2154A
L, LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
= 25°C
A
MIN
58V
3A
1A
23.4V
LTM8056
Buck-Boost
OUT
TYP MAX
7V
6.8V
5.8V
24.8V
93%
525kHz
3.6A
IN
dc2154af
1