Component - Boost Converter (BoostConv) V1.50 Datasheet.pdf

PSoC® Creator™ Component Data Sheet
Boost Converter (BoostConv)
1.50
Features
•
Produces a selectable output voltage that is higher than the input
voltage
•
Input voltage range between 0.5 V and 5.5 V
•
Boosted output voltage range between 1.8 V and 5.25 V
•
Source up to 50 mA depending on the selected input and output voltage parameter values
•
Two modes of operation: Active and Standby
•
Boost standby mode operation with autothump is not supported on PSoC3 ES2 and
PSoC5 ES1. Only Boost active mode operation is supported on these devices.
General Description
The Boost Converter (BoostConv) component provides the ability to configure and control the
PSoC boost converter hardware block. The boost converter enables input voltages that are lower
than the desired system voltage to be boosted to the desired system voltage level. The converter
uses an external inductor to convert the input voltage to the desired output voltage.
The BoostConv component is enabled by default with a selected output voltage of 3.3 V. The
BoostConv component parameters can be adjusted at run time through APIs. The configuration
specified in the component customizer will be the default configuration.
The boost converter has two main operating modes:
•
Active – Active mode is the normal mode of operation where the boost regulator actively
generates a regulated output voltage.
•
Standby –Standby mode is a low power mode of operation.
When to use the Boost Component
The BoostConv component should be used when the available voltage source for a system is
less than the required voltage level to operate the system. The BoostConv component accepts a
battery or other input voltage and produces a higher output voltage
As an example, the system may use a 0.5 V solar cell as the primary power source and rely on
the boost block to power the 1.8 V PSoC core. In another application, a 3.3 V system could use
the BoostConv component to power a 5.0 V LCD glass.
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document Number: 001-60866 Rev. *A
Revised December 9, 2010
Boost Converter (BoostConv)
PSoC® Creator™ Component Data Sheet
Input/Output Connections
The BoostConv component requires no connections in the project schematic view. Fixed function
pins support the boost converter block circuit. The system circuit must provide connections for
the input voltage (Vbat), output voltage (Vout), inductor pin (Ind) and battery ground (Vssb).
Refer to the schematic representation shown in the Functional Description section.
Component Parameters
Drag a BoostConv component onto your design and double-click it to open the Configure dialog.
Vbat Input Voltage
This is the Vbat or other voltage source that will be used as the input voltage to the boost
converter block. This system circuit will connect this voltage to the Vbat PSoC pin. The input
voltage can be between 0.5 V and 5.5 V. This value is used to calculate the estimated maximum
output current. The default value is 1.8 V.
Output Voltage
This is the target output voltage that the boost converter block will maintain. Use the pull-down
menu to select the desired output voltage. Output voltage levels are provided in 0.1 V increments
from 1.8 V to 3.6 V and in 0.25 volt increments from 4.00 V to 5.25 V. The default value is 3.3 V.
An external Schottky diode is required for output voltages above 3.6 V.
The output voltage value can be modified at run time via the BoostConv_SelVoltage() function.
Page 2 of 16
Document Number: 001-60866 Rev. *A
PSoC® Creator™ Component Data Sheet
Boost Converter (BoostConv)
Switching frequency
This is the switching frequency at which the boost converter block will operate. This value is an
enumerated type and can be set to any of the following frequencies:
•
100 kHz
•
400 kHz
•
2 MHz
•
External 32 kHz
The 100 kHz, 400 kHz, and 2 MHz switching frequencies are generated using an oscillator
internal to the boost converter block. The External 32 kHz switching frequency is intended for
Standby mode automatic thump regulation.
External clock source
The External 32 KHz to the Boost frequency is the source of the switching signal when the boost
converter block is configured to use an external clock. This value can be set to any of the
following frequencies:
•
None
•
ECO 32kHz
•
ILO 32kHz
Note The external 32 kHz clock (ECO or ILO) selection is only supported in ES3 silicon. Select
"None" for PSoC 3 ES2 or PSoC 5 ES1 silicon.
Max output current
This is an estimate of the maximum output current available from the boost converter block
based on the specified Vbat and Output Voltage values. This is a read-only value.
Placement
The BoostConv component uses the dedicated boost converter hardware block in the silicon. No
placement options are available.
Document Number: 001-60866 Rev. *A
Page 3 of 16
Boost Converter (BoostConv)
PSoC® Creator™ Component Data Sheet
Resources
API Memory
(Bytes)
Digital Blocks
Resources
Datapaths
Macro
cells
Status
Registers
Control
Registers
Counter7
Flash
RAM
Pins (per
External I/O)
BoostConv fixed
HW *
N/A
N/A
N/A
N/A
N/A
450
2
N/A
* The BoostConv component utilizes the dedicated boost converter hardware block in the silicon.
Application Programming Interface
Application Programming Interface (API) routines allow you to configure the component using
software. The following table lists and describes the interface to each function. The subsequent
sections cover each function in more detail.
By default, PSoC Creator assigns the instance name "BoostConv_1" to the first instance of a
component in a given design. You can rename it to any unique value that follows the syntactic
rules for identifiers. The instance name becomes the prefix of every global function name,
variable, and constant symbol. For readability, the instance name used in the following table is
"BoostConv".
Function
Description
BoostConv_Start
Starts the BoostConv component and puts the boost block into Active mode.
BoostConv_Stop
Disables the BoostConv component. Turns off power to the boost converter
circuitry.
BoostConv_EnableInt
Enables the boost block Under-Voltage interrupt generation.
BoostConv_DisableInt
Disables the boost block Under-Voltage interrupt generation.
BoostConv_SetMode
Sets the boost converter mode to Active or Standby.
BoostConv_SelVoltage
Selects the target output voltage the boost converter will maintain.
BoostConv_SelFreq
Sets the switching frequency to one of four possible values: 100 kHz, 400 kHz,
and 2 MHz (generated internal to the boost converter block) or 32 kHz (sourced
external to the boost converter block from the chip ECO-32 kHz oscillator).
BoostConv_EnableAutoThump
Enables automatic thump mode (only available when the boost block is in
Standby mode and the switching frequency is set to 32 kHz )
BoostConv_DisableAutoThump Disables automatic thump mode
BoostConv_ManualThump
Forces a single pulse of the boost converter switch transistors.
BoostConv_ReadStatus
Returns the boost block status register.
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Document Number: 001-60866 Rev. *A
PSoC® Creator™ Component Data Sheet
Function
Boost Converter (BoostConv)
Description
BoostConv_SelExtClk
Sets the source of 32 kHz frequency: the 32 kHz ECO or 32 kHz ILO.
BoostConv_ReadIntStatus
Returns the contents of the boost block interrupt status register.
BoostConv_Init
Initializes BoostConv registers with initial values provided from customizer.
BoostConv_Enable
This function enables the boost block (only valid when in Active mode).
Component is enabled by default.
BoostConv_Disable
Disables the boost block.
Global Variables
Function
BoostConv_initVar
Description
Indicates whether the Boost Converter has been initialized. The variable is initialized to 0 and
set to 1 the first time BoostConv_Start() is called. This allows the component to restart
without reinitialization after the first call to the BoostConv_Start() routine.
If reinitialization of the component is required, then the BoostConv_Init() function can be
called before the BoostConv_Start() or BoostConv_Enable() function.
Document Number: 001-60866 Rev. *A
Page 5 of 16
Boost Converter (BoostConv)
PSoC® Creator™ Component Data Sheet
void BoostConv_Start(void)
Description:
Starts the BoostConv component and puts the boost block into Active mode. The component
is in this state when the chip powers up. This is the preferred method to begin component
operation. BoostConv_Start() sets the initVar variable, calls the BoostConv_Init() function, and
then calls the BoostConv_Enable() function.
Parameters:
None
Return Value: None
Side Effects:
If the initVar variable is already set, this function only calls the BoostConv_Enable() function.
void BoostConv_Stop(void)
Description:
Disables the BoostConv component. Turns off power to the boost converter circuitry.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_SetMode (uint8 mode)
Description:
This function sets the boost converter mode: Active or Standby.
Parameters:
(uint8) mode – sets the operational mode for the boost block:
Mode
BoostConv_BOOSTMODE_ ACTIVE
Notes
In the active mode the boost block maintains the
selected output voltage.
BoostConv_BOOSTMODE_STANDBY Low power state, only bandgap and comparator
circuitry is active. Automatic Thump mode is used
with the external 32 kHz clock to regulate output
voltage
Return
Value:
None
Side Effects:
For Standby mode, this function enables automatic thump mode and sets the switching
frequency clock source to the 32 kHz external clock.
Page 6 of 16
Document Number: 001-60866 Rev. *A
PSoC® Creator™ Component Data Sheet
Boost Converter (BoostConv)
void BoostConv_SelVoltage (uint8 voltage)
Description:
This function selects the target output voltage the boost converter will maintain.
Parameters:
(uint8) voltage – target output voltage for the boost converter block. Output voltages above
3.6 V require an external Schottky diode
Power Setting
Value
Notes
BoostConv_VOUT_OFF
0x00
Off - High-Z
BoostConv_VOUT_1_8V
0x03
1.8 V
BoostConv_VOUT_1_9V
0x04
1.9 V
BoostConv_VOUT_2_0V
0x05
2.0 V
BoostConv_VOUT_2_1V
0x06
2.1 V
BoostConv_VOUT_2_2V
0x07
2.2 V
BoostConv_VOUT_2_3V
0x08
2.3 V
BoostConv_VOUT_2_4V
0x09
2.4 V
BoostConv_VOUT_2_5V
0x0A
2.5 V
BoostConv_VOUT_2_6V
0x0B
2.6 V
BoostConv_VOUT_2_7V
0x0C
2.7 V
BoostConv_VOUT_2_8V
0x0D
2.8 V
BoostConv_VOUT_2_9V
0x0E
2.9 V
BoostConv_VOUT_3_0V
0x0F
3.0 V
BoostConv_VOUT_3_1V
0x10
3.1 V
BoostConv_VOUT_3_2V
0x11
3.2 V
BoostConv_VOUT_3_3V
0x12
3.3 V
BoostConv_VOUT_3_4V
0x13
3.4 V
BoostConv_VOUT_3_5V
0x14
3.5 V
BoostConv_VOUT_3_6V
0x15
3.6 V
BoostConv_VOUT_4_0V
0x16
4.00 V
(external Schottky diode required)
BoostConv_VOUT_4_25V
0x17
4.25 V
(external Schottky diode required)
BoostConv_VOUT_4_5V
0x18
4.50 V
(external Schottky diode required)
BoostConv_VOUT_4_75V
0x19
4.75 V
(external Schottky diode required)
BoostConv_VOUT_5_0V
0x1A
5.00 V
(external Schottky diode required)
BoostConv_VOUT_5_25V
0x1B
5.25 V
(external Schottky diode required)
Return Value: None
Side Effects:
None
Document Number: 001-60866 Rev. *A
Page 7 of 16
Boost Converter (BoostConv)
PSoC® Creator™ Component Data Sheet
void BoostConv_SelFreq(uint8 frequency)
Description:
This function sets the switching frequency to one of four possible values
Parameters:
(uint8) switch_freq: desired switching frequency
Switch Frequency
Notes
BoostConv__SWITCH_FREQ_100KHZ Generated internal to the Boost Converter block
with a dedicated oscillator
BoostConv__SWITCH_FREQ_400KHZ
BoostConv__SWITCH_FREQ_2MHZ
BoostConv__SWITCH_FREQ_32KHZ
Comes from the ECO-32kHz or ILO-32kHz
Return Value: None
Side Effects:
None
void BoostConv_SelExtClk(uint8 source)
Description:
This function sets the source of 32 kHz frequency: the chips ECO-32 kHz
or ILO-32 kHz.
Parameters:
(uint8) source: source of 32 kHz frequency
Name
Description
BoostConv__EXTCLK_ECO
Set chip ECO-32 kHz as the source of 32 kHz frequency
BoostConv__EXTCLK_ILO
Set chip ILO-32 kHz as the source of 32 kHz frequency
Return Value: None
Side Effects:
None
void BoostConv_EnableAutoThump(void)
Description:
This function enables automatic thump mode. The AutoThump mode is available only when
the boost block is in the Standby mode. The switching frequency clock source for the boost
block must be set to the 32kHz external clock. In this mode standby boost operation is
accomplished by generating a boost switch pulse on each edge of the switching clock when
the output voltage is below the selected value.
Parameters:
None
Return Value: None
Side Effects:
Page 8 of 16
None
Document Number: 001-60866 Rev. *A
PSoC® Creator™ Component Data Sheet
Boost Converter (BoostConv)
void BoostConv_DisableAutoThump(void)
Description:
This function disables automatic thump mode.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_ManualThump(void)
Description:
This function forces a single pulse of the boost converter switch transistors.
Parameters:
None
Return Value: None
Theory:
Side Effects:
Thump produces one ~500ns pulse when set. This routine writes a ‘0’ followed by a ‘1’ to the
bit 7 "thump" bit in the boost block BOOST_CR0 register
uint8 BoostConv_ReadStatus(void)
Description:
This function returns the contents of the boost block status register
Parameters:
None
Return
Value:
(uint8) boost block status register: BOOST_SR:
Side Effects:
Bit
Name
Description
7
BoostConv_RDY
When set, internal circuits have been initialized
6
BoostConv_START
When set, converter is in startup mode
5
–
Reserved
4
BoostConv_OV
Output above overvoltage limit when 1, below limit when 0
3
BoostConv_VHI
Output is above vhigh limit when 1, below limit when 0
2
BoostConv_VNOM
Output is above nominal when 1, below nominal when 0
1
BoostConv_VLO
Output is above vlow limit when 1, below limit when 0
0
BoostConv_UV
Output is above undervoltage limit when 1, below limit when 0
None
Document Number: 001-60866 Rev. *A
Page 9 of 16
Boost Converter (BoostConv)
PSoC® Creator™ Component Data Sheet
void BoostConv_EnableInt(void)
Description:
This function enables the boost block Output Under-Voltage interrupt generation.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_DisableInt(void)
Description:
This function disables the boost block Output Under-Voltage interrupt generation.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_ReadIntStatus(void)
Description:
This function returns the contents of the boost block interrupt status register.
Parameters:
None
Return Value: (uint8) Boost interrupt status register BOOST_SR2 bit 0: When set, a Boost Output
Undervoltage event has occurred.
Side Effects:
None
void BoostConv_Init(void)
Description:
Initializes or restores the component according to the customizer Configure dialog settings. It
is not necessary to call BoostConv_Init() because the BoostConv_Start() API calls this
function and is the preferred method to begin component operation.
Parameters:
None
Return Value: None
Side Effects:
Page 10 of 16
All registers will be set to values according to the customizer Configure dialog.
Document Number: 001-60866 Rev. *A
PSoC® Creator™ Component Data Sheet
Boost Converter (BoostConv)
void BoostConv_Enable(void)
Description:
This function enables the boost block when in Active mode. The component is enabled by
default. Activates the hardware and begins component operation. It is not necessary to call
BoostConv_Enable() because the BoostConv_Start() API calls this function, which is the
preferred method to begin component operation.
Parameters:
None
Return Value: None
Side Effects:
None
void BoostConv_Disable(void)
Description:
This function disables the boost block.
Parameters:
None
Return Value: None
Side Effects:
None
Sample Firmware Source Code
PSoC Creator provides numerous example projects that include schematics and example code
in the Find Example Project dialog. For component-specific examples, open the dialog from the
Component Catalog or an instance of the component in a schematic. For general examples,
open the dialog from the Start Page or File menu. As needed, use the Filter Options in the
dialog to narrow the list of projects available to select.
Refer to the "Find Example Project" topic in the PSoC Creator Help for more information.
Interrupt Service Routine
None
Document Number: 001-60866 Rev. *A
Page 11 of 16
Boost Converter (BoostConv)
PSoC® Creator™ Component Data Sheet
Functional Description
Figure 1. Application for Boost Converter
Vboost
Vdda
Vddd Vdddio
External
Schottky diode
required when
Vput > 3.6 V
Ind
10-22µH
22µF
PSoC
0.1µF
Vbat
22µF
Vssb
Vssa
Vssd
The boost block circuit is enabled by default to support scenarios in which startup of the
processor will be powered by the Vboost voltage. The boost block is configured for Active mode
with an output voltage of 1.8 V by default. When a BoostConv component is placed in a project,
it provides access to the configuration registers for the boost hardware block. The
BoostConv_Start() function configures the BoostConv component with the settings made in the
component configuration dialog.
The boost converter hardware makes use of fixed function pins on the chip shown in the
schematic above. These signals are not shown on the BoostConv component.
Page 12 of 16
Document Number: 001-60866 Rev. *A
PSoC® Creator™ Component Data Sheet
Boost Converter (BoostConv)
Operation with input voltage greater than programmed output voltage
When Control register 2 (BOOST_CR2): Bit 1 (eqoff) =1, the output voltage will track the input
voltage when the input is greater than the programmed output voltage. This is shown below:
•
Output Voltage = Programmed voltage when Input < Programmed
•
Output Voltage = Input voltage when Input > Programmed
When Control register 2 (BOOST_CR2): Bit 1 (eqoff) = 1, the output voltage does not track until
either the optional external schottky diode or inherent internal silicon diode between the inductor
pin and output are forward biased. The effect of this is the output voltage tracks input with a
diode drop as shown below:
•
Output Voltage = Programmed voltage when Input < Programmed
•
Output Voltage = Input voltage – diode drop when Input > Programmed + diode drop
Document Number: 001-60866 Rev. *A
Page 13 of 16
Boost Converter (BoostConv)
PSoC® Creator™ Component Data Sheet
DC and AC Electrical Characteristics
The following values indicate expected performance and are based on initial characterization
data. Unless otherwise specified in the tables below, all TA = 25°C, Vdd = 5.0 V
Inductive Boost Regulator DC Specifications
Parameter
Vbat
Iboost
Lboost
Description
Input voltage
Load current
1, 2
Boost inductor
3
Conditions
Min
Typ
Max
Units
Includes startup
0.5
–
5.5
V
VIN = 1.6 – 5.5 V, Vout = 1.6 – 5.0 V,
external diode
–
–
50
mA
VIN = 1.6 – 3.6 V, Vout = 1.6 – 3.6 V,
internal diode
–
–
75
mA
VIN = 0.8 – 1.6 V, Vout = 1.6 – 3.6 V,
internal diode
–
–
30
mA
VIN = 0.8 – 1.6 V, Vout = 3.6 – 5.0 V,
external diode
–
–
20
mA
VIN = 0.5 – 0.8 V, Vout = 1.6 – 3.6 V,
internal diode
–
–
15
mA
10 µH specified
4.7
10
47
µH
22 µF || 0.1 µF specified
10
22
47
µF
Cboost
Filter capacitor
If
External Schottky diode
average forward current
External Schottky diode is required for
Vboost > 3.6 V
1
–
–
A
Vr
External Schottky diode
peak reverse voltage
External Schottky diode is required for
Vboost > 3.6 V
20
–
–
V
Ilpk
Inductor peak current
–
–
700
mA
Boost active mode
–
200
–
µA
Boost standby mode, 32 kHz external
crystal oscillator, Iboost < 1 µA
–
12
–
µA
1.8 V
1.71
1.80
1.89
V
1.9 V
1.81
1.90
2.00
V
2.0 V
1.90
2.00
2.10
V
Quiescent current
Boost output voltage range
Vboost
3, 4
1
For output voltages above 3.6 V, an external diode is required.
2
Maximum output current applies for output voltages < 4x input voltage.
3
Based on device characterization (Not production tested).
4
At boost frequency of 2 MHz, Vboost is limited to 2 x Vbat. At 400 kHz, Vboost is limited to 4 x Vbat.
Page 14 of 16
Document Number: 001-60866 Rev. *A
PSoC® Creator™ Component Data Sheet
Parameter
Description
Boost Converter (BoostConv)
Conditions
Min
Typ
Max
Units
2.4 V
2.28
2.40
2.52
V
2.7 V
2.57
2.70
2.84
V
3.0 V
2.85
3.00
3.15
V
3.3 V
3.14
3.30
3.47
V
3.6 V
3.42
3.60
3.78
V
4.75
5.00
5.25
V
Load regulation
–
–
2.5
%
Line regulation
–
–
3
%
82
90
–
%
5.0 V
External diode required
Efficiency
VBAT = 2.4 V, VOUT = 2.7 V, IOUT = 10
mA, Fsw = 400 kHz, Lboost = 22 uH,
Cboost = 22 uF || 0.01 uF
Inductive Boost Regulator AC Specifications
Parameter
Description
Conditions
Typ
Max
Units
–
–
100
mV
VRIPPLE
Ripple voltage (peak-to-peak)
FSW
Switching frequency
–
0.1, 0.4,
or 2
–
MHz
Duty cycle
20
–
80
%
Document Number: 001-60866 Rev. *A
VOUT = 1.8 V, FSW = 400 kHz, IOUT = 10
mA
Min
Page 15 of 16
Boost Converter (BoostConv)
PSoC® Creator™ Component Data Sheet
Component Changes
This section lists the major changes in the component from the previous version.
Version
1.50.a
Description of Changes
Reason for Changes / Impact
Added autothump support note to Features in
datasheet
Silicon bug in PSoC3 ES2 and PSoC5 ES1
Added information to the component that advertizes
its compatibility with silicon revisions.
The tool reports an error/warning if the
component is used on incompatible silicon. If this
happens, update to a revision that supports your
target device.
Added characterization data to datasheet
Removed reference to sleep mode from datasheet
Component doesn’t support sleep mode.
Minor datasheet edits and updates
1.50
Added support of PSoC3 ES3 silicon. Three API
functions have been added:
void BoostConv_EnableInt(void);
void BoostConv_DisableInt(void);
uint8 BoostConv_ReadIntStatus(void);
Boost Converter supports generation of
undervoltage signal.
API function has been added:
void BoostConv_SelExtClk(uint8);
To support selection of external switching clock
sources of Boost Converter: ILO or ECO.
Added BoostConv_Init() function.
To comply with corporate standard and provide
an API to initialize/restore the component without
starting it.
© Cypress Semiconductor Corporation,2009- 2010. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the
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be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
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products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
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registered trademarks referenced herein are property of the respective corporations.
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conjunction with a Cypress integrated circuit as specified in the applicable agreement. Any reproduction, modification, translation, compilation, or representation of this Source Code except as
specified above is prohibited without the express written permission of Cypress.
Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cypress reserves the right to make changes without further notice to the materials described herein.
Cypress does not assume any liability arising out of the application or use of any product or circuit described herein. Cypress does not authorize its products for use as critical components in lifesupport systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress’ product in a life-support systems application
implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Use may be limited by and subject to the applicable Cypress software license agreement.
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Document Number: 001-60866 Rev. *A
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