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Description
Demonstration circuit 1625A is intended to demonstrate
performance of the LTC4227-1/LTC4227-2 dual ideal diode
and Hot Swap™ controller. Each rail has an individual
ideal diode. Ideal diode outputs are connected to the load
through a single Hot Swap circuit.
The DC1625 allows verifying the LTC4227 Hot Swap and
ideal diode functionality during individual supply ramp-up
and ramp-down transients, during power supply shifting
(transferring) transients, steady state, and overcurrent
fault conditions.
Each DC1625A rail circuit is assembled to operate over
the full operating voltage range of the LTC4227: 2.9V to
18V, with a 7.6A maximum current load.
perForMAnce sUMMArY
SYMBOL
PARAMETER
Supplies
V
Input Supply Range
IN
V
Internal Regulator Voltage
INTVCC
V
Internal V
INTVCC(UVL)
Ideal Diode Control
ΔV
Forward Regulation Voltage (V
FWD(REG)
ΔV
External N-Channel Gate Drive
DGATE
(V
DGATEN
I
CPO
CPO(UP)
N
I
DGATE
DGATE(FPU)
I
DGATE
DGATE(FDU)
I
DGATE2 Off Pull-Down Current
DGATE2(DN)
t
DGATE
ON(DGATE)
t
DGATE
OFF(DGATE)
t
D2ON Low to DGATE2 High
PLH(DGATE2)
Hot Swap Control
ΔV
Circuit Breaker Trip Sense Voltage
SENSE(CB)
(V
SENSE
ΔV
Active Current Limit Sense Voltage
SENSE(ACL)
(V
SENSE
Arrow.com.
Downloaded from
Undervoltage Lockout
CC
– V
INN
SENSE
- V
)
INN
Pull-Up Current
Fast Pull-Up Current
N
Fast Pull-Down Current
N
Turn-On Delay
N
Turn-Off Delay
N
+
–
- V
)
SENSE
+
–
- V
)
SENSE
DEMO MANUAL DC1625A
LTC4227-1/LTC4227-2
Dual Ideal Diode and
Single Hot Swap Controller
The board's main components include the LTC4227 con-
troller, two power MOSFETs controlled as ideal diodes and
one power MOSFET controlled as a Hot Swap device, two
jumpers for enabling the second ideal diode (D2ON_SEL)
and Hot Swap controller (HS_ON), two LEDs to indicate
power good (PWRGD) and fault (FAULT) conditions, seven
banana jacks for connecting power supplies and load, many
turrets and pads for observing circuit signals.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
(T
= 25°C)
A
CONDITIONS
INTV
Rasing
CC
)
IN < 7V, ΔV
= 0.1V
FWD
IN = 7V to 18V, ΔV
= 0.1V
FWD
CPO = IN = 2.9V
CPO = IN = 18V
ΔV
= 0.2V, ΔV
= 0V, CPO = 17V
FWD
DGATE
ΔV
= –0.2V, ΔV
= 5V
FWD
DGATE
D2ON = 2V, ΔV
= 2.5V
DGATE2
ΔV
= 0.2V, C
= 10nF
FWD
GATE
ΔV
= –0.2V, C
= 10nF
FWD
GATE
MIN
TYP
MAX
UNITS
2.9
18.0
4.5
5
5.6
2.1
2.2
2.3
10
25
40
mV
5
7
14
10
12
14
60
95
120
50
85
110
0
–1.5
1.5
40
100
200
0.25
0.5
0.2
0.5
40
100
47.5
50
52.5
mV
60
65
70
mV
dc1625af
1
V
V
V
V
V
µA
µA
A
A
µA
µs
µs
µs
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Table of Contents
Related Manuals for Linear Technology LTC4227-1
Summary of Contents for Linear Technology LTC4227-1
- Page 1 Each DC1625A rail circuit is assembled to operate over L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the the full operating voltage range of the LTC4227: 2.9V to property of their respective owners.
-
Page 2: Operating Principles
If the has additional on/off control. input supply fails or is shorted, a fast turn-off minimizes The LTC4227-1 features a latch-off circuit breaker, while reverse current transients. the LTC4227-2 provides automatic retry after a fault. -
Page 3: Quick Start Procedure
DEMO MANUAL DC1625A qUick stArt proceDUre Demonstration circuit 1625A is easy to set up to evalu- If the second ideal diode is used: ate the performance of the LTC4227. Refer to Figure 1 JP1 EN_SEL in the position LOW for proper measurement equipment setup and follow the JP2 D2ON_SEL in the position ON procedure below: JP3 ON_SEL in the position OFF... - Page 4 DEMO MANUAL DC1625A qUick stArt proceDUre IDEAL DIODE FUNCTIONALITY TEST one voltmeter between IN1 and IN2 turrets to measure the difference between two input voltages. Connect an In this test, both ideal diodes are active and small varia- electronic load to the output turret. Activate both rail and tions in the input voltage forces one ideal diode to be off keep a load around 1A to 3A.
- Page 5 DEMO MANUAL DC1625A qUick stArt proceDUre – POWER SUPPLY 1 LOAD SWITCH POWER SUPPLY 2 – DC1625A F01 Figure 1. Measurement Equipment Setup for the LTC4227 Test dc1625af Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
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Page 6: Parts List
DEMO MANUAL DC1625A pArts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C2 ,C3, C4, C6, CAP, X7R, 0.1µF, 50V, 0603 TDK, C1608X7R1H104K C7, C10, C11 CAP, X7R, 15nF, 50V, 0603 AVX, 06035C153KAT C8, C9 OPT CAP, AL, El, S/M 100µF, 50V SUNCON, 50CE100BS CAP, AL, El, S/M 100µF, 50V SUNCON, 50CE100BS... -
Page 7: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 8 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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