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参数资料
| 型号： | PS200-I/SS |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO20 |
| 封装： | 5.30 MM, PLASTIC, MO-150, SSOP-20 |
| 文件页数： | 32/36页 |
| 文件大小： | 537K |
| 代理商： | PS200-I/SS |
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2005 Microchip Technology Inc.
DS21891B-page 3
PS200
1.0
PS200 OVERVIEW
The PS200 is a configurable Switch mode charger
which is comprised of a PIC16F microcontroller core
and precision analog circuitry. This section explores the
hardware features in relation to generic Switch mode
charging. Subsequent sections will describe the opera-
tion of the PS200 with firmware for Lithium-based
Nickel-based (Section 3.0 “Nickel Chemistry Algo-
rithm”) and Lead Acid (Section 4.0 “Lead Acid
Chemistry Algorithm”) charging.
Oscillator
Power-saving Sleep mode
Power-on Reset (POR)
Brown-out Reset (BOR)
High-Endurance Flash/EEPROM Cell:
- 100,000 write Flash endurance
- 1,000,000 write EEPROM endurance
- Flash/Data EEPROM retention: > 40 years
High-Speed Comparator module with:
- Two independent analog comparators
Operational Amplifier module with two
independent op amps
Two-Phase Asynchronous Feedback PWM
Voltage Regulator
10-bit (9-bit plus sign) A/D Converter
In-Circuit Serial Programming (ICSP) via
two pins
1.1
Hardware Features
The PS200 features are well-suited for Switch mode
battery charging. The PS200 device’s block diagram
(Figure 1-1) is to be used in conjunction with the Switch
mode charger example (Figure 2-3, page 12).
Current/Voltage Measurement Block – The
Current/Voltage Measurement Block consists of a
10-bit Analog-to-Digital converter, operational
amplifiers and a comparator. The output of this
block is fed into the Charge Control module.
Please refer to Figure 1-1.
The inputs into this block are to be connected as
described in Figure 2-3. The following signals are
inputs into this block:
- LOOPFBK – to comparator
-LOOPIN – to op amp and ADC
-CTRLIN – to op amp
-IFBINB – to op amp
-IFBINA – to op amp
- BATID – to ADC
- TEMP – to ADC
- CHGFBK – to comparator
The following signals are outputs from this block:
-IFBOUT – from op amp
Charge Control Module:
- The charge control module generates a
Pulse-Width Modulated signal called CHGOUT.
Its frequency is configurable and can be set up
to 1 MHz. This signal is connected to an
external DC/DC buck converter.
Voltage Regulator
- The integrated voltage regulator is designed
to work with unregulated DC supplies.
- There are guidelines that should be followed.
A series limiting resistor (RVDD) should be
placed between the unregulated supply and
the VDD pin. The value for this series resistor
(RVDD) must be between RMIN and RMAX as
shown in the following equation:
EQUATION 1-1:
The precision internal 8 MHz clock oscillator
eliminates the need for external oscillator circuits.
In-circuit configurability utilizing 256 bytes of
on-board EEPROM.
Power on Reset – The POR insures the proper
start-up of the PS200 when voltage is applied to
VDD.
Brown-out Reset – The BOR is activated when
the input voltage falls to 2.1V; the PS200 is reset.
Where:
RMAX = maximum value of series resistor (ohms)
RMIN = minimum value of series resistor (ohms)
Vs(MIN) = minimum value of charger DC supply (VDC)
Vs(MAX) = maximum value of charger DC supply (VDC)
I(led) = total current drawn by all LEDs when
illuminated simultaneously
The 1.05 and .95 constants are included to compensate
for the tolerance of 5% resistors. The 16 mA constant is
the anticipated load presented by the PS200, including
the loading due to external components and a 4 mA
minimum current for the shunt regulator itself. The
50 mA constant is the maximum acceptable current for
the shunt regulator.
Vs(MIN) – 5V) * 1000
RMAX =
1.05 * (16 mA + I(led))
Vs(MAX) – 5V) * 1000
RMIN =
.95 * (50 mA)
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