DC1394A - Demo Manual

QUICK START GUIDE FOR
DC1394A
PMIC High Voltage Adaptor Board
With 5V Adaptor Inputs
DESCRIPTION
Demonstration Circuit 1394A is a 38V, 2A, 2.4MHz
Step-Down Switching Regulator with 70μA Quiescent
Current. The LT3480EDD is available in a 10-pin
(3mm × 3mm) DFN surface mount package.
L, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered
trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy
Drive, FilterCAD, Hot Swap, LinearView, μModule, Micropower SwitcherCAD, Multimode
Dimming, No Latency ΔΣ, No Latency Delta-Sigma, No RSENSE, Operational Filter, PanelProtect,
PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT,
UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names
may be trademarks of the companies that manufacture the products.
PERFORMANCE SUMMARY Specifications are at TA = 25°C
SYMBOL
HVIN
5V ADAPTOR
HVBUCK
IHVBUCK
PARAMETER
High Voltage Input Voltage Range
5V Adaptor Input Voltage Range
Output Voltage Range
Output Current
CONDITIONS
Input disabled from 38-60V
Range is mode and load dependant
QUICK START PROCEDURE
Using short twisted pair leads for any power
connections, with all loads and power supplies
off, refer to Figures 1 & 2 for the proper measurement and equipment setup.
A companion PMIC demo board is required for
this check out procedure. The DC1303A
(LTC4098EPDC) board is recommended, and
will be used for the following procedure.
Please refer to the DC1303A Quick Start
Guide for further information.
Follow the procedure below:
1. Set PS1 to 8V, PS2 to 0V, and PS3 to
3.6V. Set Load1 to 0A. Ensure that jumpers are configured as per Figure 1, except
the “D2” jumper (JP3) on the DC1303A
should be set to “1”.
2. Observe that 4.60V < VOUT (VM3) <
4.80V. The LT3480 HV Buck regulator is
running with its control loop closed locally.
The nominal HVBUCK voltage is 4.75V,
and the LTC4098EPDC on the DC1303A
board has connected HVBUCK to VOUT.
1
MIN
8
4.5
3.5
TYP
MAX
60
5.5
5.5
2
UNITS
V
V
V
A
3. Set Load1 to 2A. Observe that 4.60V <
VOUT (VM3) 4.80V. Set Load1 to 0A.
The 2A load on VOUT loads HVBUCK, so
the LT3480EDD is supplying 2A.
4. Set PS1 to 38V. Observe that 4.60V <
VOUT (VM3) < 4.80V. The LT3480 is designed to operate from HVIN = 8V to 38V.
5. Set Load1 to 2A. Observe that 4.60V <
VOUT (VM3) < 4.80V. Set Load1 to 0A.
The LT3480 is now supplying 2A, while
operating from 38V.
6. Set “COMP” jumper (JP2) to “REMOTE”.
Observe that 3.80V < VOUT (VM3) <
4.10V. The LTC4098EPDC is now controlling the LT3480 output voltage to approximately V(BAT) + 0.3V.
7. Set Load1 to 2A. Observe that 3.80V <
VOUT (VM3) < 4.10V. Set Load1 to 0A.
LT3480 is supplying 2A, while under
LTC4098 control.
8. Set PS1 to 8V. Observe that 3.80V <
VOUT (VM3) < 4.10V.
9. Set Load1 to 2A. Observe that 3.80V <
(VM3) < 4.10V. Set Load1 to 0A.
10. Set PS2 to 4.5V, and “WALL” jumper (JP3)
to “5V ADAPTOR”. Observe that 4.40 <
VOUT (VM3) < 4.50V. The LT3480 is not
supplying power to VOUT. This verifies
that the LTC4098 recognizes the 5V Adapator input, and connects it to VOUT.
11. Set Load1 to 1A. Observe that 4.40V <
VOUT (VM3) < 4.50V. Set Load1 to 0A.
12. Set PS2 to 5.5V. Observe that 5.40V <
VOUT (VM3) < 5.50V.
13. Set Load1 to 1A. Observe that 5.40V <
VOUT (VM3) < 5.50V.
2
-
+
PS1
+
0V-40V supply
1A
-
VM1
-
+
PS2
+
0V-6V supply
2A
-
+
AM1
AM2
+
VM2
-
D2
D1
D0
AM3
-
+
+
+
VM3
-
-
Load1
0V-5V
5A
AM4
+
-
+
VM4
-
3.6Ω
+
-
Note: All connections from equipment should be Kelvin connected directly to the Board PINS which they are connected to on this diagram and any input, or output, leads should be twisted pair
Figure 1. Proper Measurement Equipment Setup for DC1394A
GND
VIN
Figure 2. Measuring Input or Output Ripple
3
PS3
0V-5V supply
2A
Figure 3. DC1394A Schematic
HVIN
E1
GND
4.5V - 5.5V
5V ADAPTOR
GND
E2
E4
E3
R3
1
5%
C3
10
0603
6.3V
C2
0.068uF
50V
0603
BURST
PWM/SYNC
JP1
SYNC
R1
150k
R2
40.2k
8
10
6
5
FB
RT
SYNC
RUN/SS
LT3480EDD
U1
4
11
GND
VIN
Unless noted:
Resistors: Ohms
0402
1%
1/16W
Capacitors: uF
0402
10%
25V
C1
4.7uF
50V
1206
BD
Vc
PG
SW
BOOST
9
7
3
2
1
REMOTE
LOCAL
C4
330pF
R4
20k
NR6045T6R3M
L1
6.3uH
C5
VALUE
OPT
C6
VALUE
OPT
TP1
Note: * Move JP2 to REMOTE when connected to PMIC board.
JP2
COMP
D1
DFLS240L
40V
2A
C8
0.47uF
25V
0603
1
2
8V - 38V
R5
100k
R6
499k
R7
20
5%
C7
22uF
0805
6.3V
HV BUCK
R8
10k
5%
5V
ADAPTOR
JP3
WALL
1
3
2
4
VOUT
VC/TRACK
VOUT
GND
ACPR
GND
PG
WALL
SYNC
SHDN
DVCC
ILIM
SDA
HVOK/INIT
SCL
HVIN
J1
2A
TSH-108-01-T-RA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GND
HV BUCK
INTERFACE
Q1
Si2333DS
E5
HVBUCK
3.7V - 4.7V
E6
Figure 4. DC1394A BOM
5
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