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Linear Technology LTC4020EUHF Demo Manual

High voltage buck-boost multi-chemistry battery charger
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Description
Demonstration circuit 2044A is a 55V buck-boost multi-
chemistry battery charger featuring the LTC4020. The board
will accept an input voltage between 15V and 55V. The
float voltage of the battery output (BAT) is 25.2V, with 3.3A
maximum charge current. The converter output (VOUT)
has a voltage range of 21V to 28V, with 3A maximum load
current. The LTC4020 contains a high efficiency synchro-
nous buck-boost DC/DC controller and uses a proprietary
average current mode architecture.
The LTC4020 battery charger can provide a constant-
current/constant-voltage charge algorithm (CC/CV, with
MODE pin grounded), constant-current charging (CC, with
performance summary
SYMBOL
Input Voltage Range
Battery Float Voltage (BAT) (Nominal)
Converter Output Voltage (VOUT)
Maximum Battery Charge Current, I
Maximum Converter Output Current, I
Typical Efficiency
Typical Converter Output Ripple
Arrow.com.
Downloaded from
Multi-Chemistry Battery Charger
Specifications are at T
CONDITIONS
I
= 0A to 3.3A
BAT
I
= 0A to 3A
OUT
I
= 0A
BAT
OUT
I
= 0A
OUT
BAT
V
= 24V, V
IN
V
= 55V, V
IN
DEMO MANUAL DC2044A
High Voltage Buck-Boost
MODE pin floated), or charging with an optimized 4-step,
3-stage lead-acid battery charge profile (connect MODE pin
to INTV
, with a 0Ω jumper at the optional R29 position).
CC
The LTC4020 data sheet gives a complete description of the
IC operation and application information. The data sheet
must be read in conjunction with this quick start guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2044A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
= 25°C
A
= 25.2V, I
= 3A
OUT
OUT
= 25.2V, I
= 3A (20MHz BW)
OUT
OUT
LTC4020EUHF
VALUE
15V to 55V
25.2V
21V to 28V
3.3A
3A
97%
56mV
P-P
dc2044af
1

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Summary of Contents for Linear Technology LTC4020EUHF

  • Page 1 The LTC4020 battery charger can provide a constant- L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. current/constant-voltage charge algorithm (CC/CV, with...

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC2044A Quick start proceDure Demonstration circuit 2044A is easy to set up to evaluate Additional Notes: the performance of the LTC4020. Refer to Figure 1 for 1. CAUTION: Be careful when testing with high voltage. the proper measurement equipment setup and follow the High voltage can result in an electric shock if care procedure below: is not taken.
  • Page 3 DEMO MANUAL DC2044A Quick start proceDure dc2044a F01 Figure 1. Proper Measurement Equipment Setup – dc2044a F02 Figure 2. Measuring Output Voltage Ripple dc2044af Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from...
  • Page 4 DEMO MANUAL DC2044A Quick start proceDure 0.01 LOAD CURRENT (A) dc2044a F03 Figure 3. Efficiency vs Load Current (V = 25.2V) 22 26 30 34 38 42 46 50 56 dc2044a F04 Figure 4. Efficiency vs Input Voltage (V = 25.2V, I = 3A) dc2044af Arrow.com.

  • Page 5: Parts List

    DEMO MANUAL DC2044A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components CAP, CHIP, X7S, 0.1µF, 10%, 100V, 0603 TDK, C1608X7S2A104K C2, C3, C15, C17 CAP, ELEC, 56µF, 20%, 63V, 10.3mm × 10.3mm SUNCON, 63HVH56M CAP, CHIP, C0G, 100pF, 10%, 16V, 0402 AVX, 0402YA101KAT9A CAP, CHIP, C0G, 0.1µF, 10%, 16V, 1206 KEMET, C1206H104J3GACTU...
  • Page 6 RES, CHIP, 0.008Ω, 1%, 0.5W, 1206 VISHAY, WSL12068L000FEA18 RCBAT1 RES, CHIP, 0.015Ω, 1%, 0.5W, 1206 TT ELEC LRC-LRF1206F-01-F IC, LTC4020EUHF, 5mm × 7mm QFN38 LINEAR TECHNOLOGY, LTC4020EUHF Additional Demo Board Circuit Components C7, C13, C22, C24 ,C25 , C26, C30, CAP, CHIP, OPTIONAL...

  • 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.