MCP1631RD-DCPC1 Microchip Technology, MCP1631RD-DCPC1 Datasheet - Page 10

• Manufacturer Part Number: MCP1631RD-DCPC1
• Description: REF DES BATT CHARG OR LED DRIVER
• Manufacturer: Microchip Technology

Specifications of MCP1631RD-DCPC1

• Current - Output / Channel: 700mA
• Outputs And Type: 1, Non-Isolated
• Features: Firmware for Li-Ion, NiMH, and NiCd Battery Charger
• Voltage - Input: 3.5 ~ 16 V
• Utilized Ic / Part: MCP1631HV, PIC16F616
• Core Chip: MCP1631HV, PIC16F616
• Topology: Parallel, Series
• Output Current: 1A
• No. Of Outputs: 1
• Input Voltage: 3.5V To 16V
• Dimming Control Type: Analog
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP1631HV Digitally Controlled Programmable Current Source Reference Design
1.2
1.3
DS51798A-page 6
WHAT IS THE MCP1631HV DIGITALLY CONTROLLED PROGRAMMABLE
CURRENT SOURCE REFERENCE DESIGN?
WHAT THE MCP1631HV DIGITALLY CONTROLLED PROGRAMMABLE
CURRENT SOURCE KIT INCLUDES
This board utilizes Microchip’s MCP1631HV-3.3 (high-speed PIC
TSSOP-20, 3.3V supply version).
The MCP1631HV Digitally Controlled Programmable Current Source Reference
Design is a complete stand-alone constant current LED power supply with a dimming
ratio of 10:1. The board is capable of delivering a maximum of 1 Amp @ 8.5W output
power. Efficiency is typically 85% at the maximum power.
TABLE 1-1:
The board may also be re-programmed to charge Li-Ion, NiMH, and NiCd battery
packs. The MCP1631HV Digitally Controlled Programmable Current Source Reference
Design is capable of charging one to four NiMH/NiCd batteries connected in series or
one to two Li-Ion batteries in series. See Table 1-2 for detailed charger capabilities.
TABLE 1-2:
The input voltage range for the reference board is 3.5V to 16V.
An input terminal block is provided to apply the input voltage to the board. An output
header with 5 pins is also provided as a means to connect the load LEDs or battery
pack and an external 10 kΩ thermistor. When used, thermistors should either be
mounted on the LED heatsink next to the LED case or internal to the MiMH/NiCd
battery pack.
A programming header compatible with the PICkit
board for updating the firmware contained in the PIC16F616. Firmware updates are
required to switch between LED, NiMH/NiCd, and Li-Ion modes of operation.
The MCP1631HV Digitally Controlled Programmable Current Source kit includes:
• The MCP1631HV Digitally Controlled Programmable Current Source Reference
• Important Information “Read First”
Note 1:
Battery Chemistry
Li-Ion
NiMH or NiCd
output current
Design,102-00234
Note:
Maximum
700 mA
2:
Maximum output current can be modified in the source code. Absolute max is 1A
@8.5W.
For an easy start with the MCP1631HV Digitally Controlled Programmable Current
Source Reference Design Board, this option is not enabled in the compiled .hex file
which is available on the Microchip website.
The SEPIC converter is capable of buck-boost operation. The duty cycle
may be changed in the source code to allow boost operation. Set the
“
#define OSCILLATOR_DUTY_CYCLE
for 25% duty cycle and to allow boost operation.
00234R1.h
1
DEFAULT OUTPUT CAPABILITY IN DRIVING LED MODE
MULTI-CHEMISTRY CHARGER CAPABILITY
Dimming ratio
” header file pre-processor duty cycle definition to:
10:1
700 mA
1 Cell
1A
Output power
Maximum
500 mA
700 mA
2 Cells
8.5W
25
1
TM
2 and ICD 2 programmers is on
Overvoltage
protection
700 mA
3 Cells
© 2009 Microchip Technology Inc.
9V
NA
®
MCU PWM
shutdown
Thermal
700 mA
4 Cells
40
NA
°
C
2