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CY8CLED03D01 Datasheet(PDF) 9 Page - Cypress Semiconductor

Part # CY8CLED03D01
Description  PowerPSoC Intelligent LED Driver
Download  52 Pages
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY8CLED03D01 Datasheet(HTML) 9 Page - Cypress Semiconductor

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CY8CLED04D01, CY8CLED04D02
CY8CLED04G01, CY8CLED03D01
CY8CLED03D02, CY8CLED03G01
CY8CLED02D01, CY8CLED01D01
Document Number: 001-46319 Rev. *G
Page 9 of 52
4.2 Low Side N-Channel FETs
The internal low side N-Channel FETs are designed to enhance
system integration. The low side N-Channel FETs include the
following key features:
Drive capability up to 1A
Switching times of 20 ns (rise and fall times) to ensure high
efficiency (more than 90%)
Drain source voltage rating 32V
Low RDS(ON) to ensure high efficiency
Switching frequency up to 2 MHz
4.3 External Gate Drivers
These gate drivers enable the use of external FETs with higher
current capabilities or lower RDS(ON). The external gate drivers
directly drive MOSFETS that are used in switching applications.
The gate driver provides multiple programmable drive strength
steps to enable improved EMI management. The external gate
drivers include the following key features.
Programmable drive strength options (25%, 50%, 75%, 100%)
for EMI management
Rise and fall times at 55 ns with 4 nF load
4.4 Dimming Modulation Schemes
There are three dimming modulation schemes available with the
PowerPSoC. The configurable modulation schemes are:
Precise Intensity Signal Modulation (PrISM)
Delta Sigma Modulation Mode (DMM)
Pulse Width Modulation (PWM)
4.4.1 PrISM Mode Configuration
High resolution operation up to 16 bits
Dedicated PrISM module enables customers to use core PSoC
digital blocks for other needs
Clocking up to 48 MHz
Selectable output signal density
Reduced EMI
The PrISM mode compares the output of a pseudo-random
counter with a signal density value. The comparator output
asserts when the count value is less than or equal to the value
in the signal density register.
4.4.2 DMM Mode Configuration
High resolution operation up to 16 bits
Configurable output frequency and delta sigma modulator
width to trade off repeat rates versus resolution
Dedicated DMM module enables customers to use PSoC
digital blocks for other uses
Clocking up to 48 MHz
The DMM modulator consists of a 12-bit PWM block and a 4-bit
DSM (Delta Sigma Modulator) block. The width of the PWM, the
width of the DMM, and the clock defines the output frequency.
The duty cycle of the PWM output is dithered by using the DSM
block which has a user selectable resolution up to 4 bits.
4.4.3 PWM Mode Configuration
High resolution operation up to 16 bits
User programmable period from 1 to 65535 clocks
Dedicated PWM module enables customers to use core PSoC
digital blocks for other use
Interrupt on rising edge of the output or terminal count
Precise PWM phase control to manage system current edges
Phase synchronization among the four channels
PWM output can be aligned to left, right, or center
The PWM features a down counter and a pulse width register. A
comparator output is asserted when the count value is less than
or equal to the value in the pulse width register.
4.5 Current Sense Amplifier
Four high side current sense amplifiers provide a differential
sense capability to sense the voltage across current sense
resistors in lighting systems. The current sense amplifier
includes the following key features:
Operation with high common mode voltage to 32V
High common mode rejection ratio
Programmable bandwidth to optimize system noise immunity
An off-chip resistor Rsense is used for high side current
measurement as shown in Figure 4-3 on page 10. The output of
the current sense amplifier goes to the Power Peripherals
Analog Multiplexer where the user selects which hysteretic
controller to route to. Table 4-1 illustrates example values of
Rsense for different currents.
Table 4-1. Rsense Values for Different Currents
Max Load Current (mA)
Typical Rsense (mΩ)
1000
100
750
130
500
200
350
300
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