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參數(shù)資料
| 型號： | MC34920 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | 2.8 Ohm(Typ) Quad H-Bridge Motor Driver(2.8歐（典型值）四H橋電機(jī)驅(qū)動器) |
| 中文描述： | 2.8歐姆（典型值）四H橋電機(jī)驅(qū)動器（2.8歐（典型值）四魔橋電機(jī)驅(qū)動器） |
| 文件頁數(shù)： | 21/28頁 |
| 文件大小： | 813K |
| 代理商： | MC34920 |
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
34920
21
Voltage Regulator Output Requirements
Table 8
provides a listing of the output voltages and currents.
Both switchmode converters operate at approximately 200 kHz
±25 kHz.
The V1 and V2 regulators provide individual internal over-
temperature sensing for protection. During an overtemperature
event, when the device T
J
is at or above T
J(SHUTDOWN)
, the
internal thermal protection circuit disables the drive outputs by
driving all outputs to the zero current state until the device
temperatures have dropped below the lower thermal threshold
temperature T
J(ENABLE)
, at which time the driver is re-enabled.
The V1 and V2 voltage regulators may be shut down by
applying a voltage in the range of 3.0 V to 6.0 V to the
respective V1_FB and V2_FB terminals. This will result in the
regulator output voltages to be equal to 0 V.
Overcurrent Protection
Output voltages V
V1
and V
V2
are short circuit protected. The
outputs respond to an overcurrent situation by limiting the
internal switching duty cycle. This can be reset by removing the
main supply to the chip or when the short circuit condition is
removed. Refer to the respective I
OC
and I
SC
values for V1 and
V2
voltage regulators on
page 6
of the Static Electrical
Characteristics table.
Power-Saving Mode of Operation
The V2 voltage regulator can be disabled via the serial
interface by setting the V2_Enable bit (bit 1–LSB) to a value of
0. This provides a reduction in the bias current provided by the
V1 supply.
V1 Voltage Regulator
Implementation of the V1 switching voltage regulator is
accomplished through the use of an internal switch MOSFET,
internal MOSFET current sense resistor, external Schottky
diode, external inductor, and filter capacitor. The frequency of
operation of this regulator is controlled by the internal clock,
which is 200 kHz ±25 kHz. The duty cycle (on-time) for this
internal regulator clock is a fixed 37.5%. This regulator switches
out of phase from the V2 regulator to minimize ripple current on
VB+. The line regulation range is 21 V < V
VB+
< 42 V. The load
side regulation is specified on
page 6
of the Static Electrical
Characteristics table.
This converter is designed so that the current limit threshold
is lowered during the power-on period to allow for a “softer”
start-up, thereby reducing electrical stress in the external
components. This limiting is required for their safe operation.
The voltage is set externally with a resistor (1% tolerance)
divider network. The V1_FB input voltage should be chosen,
using external voltage divider resistors, so as to provide a
regulator feedback voltage, for the required output regulated
voltage, to equal the internal regulator reference voltage of
2.50 V ±2%. The V1 regulator is ideal for providing either 3.3 V
or 5.0 V with a precision of +5%/-4%.
Output current sensing is implemented by sensing the
voltage across an internal sense resistor connected between
VB+ and the drain of the internal MOSFET. Current is
measured on a cycle-by-cycle basis. The purpose of this
current sense is to prevent damage to the 34920 and its
associated external components.
V2
Voltage Regulator
The V2 switching voltage regulator is implemented as a buck
regulator with an internal switch MOSFET, internal MOSFET
current sense resistor, external Schottky diode, external
inductor, and filter capacitor. The frequency of operation of this
regulator is controlled by the internal clock, which is 200 kHz
±25 kHz. This regulator switches out of phase from the
V1 regulator to minimize ripple current on VB+.
This converter is designed so that the current limit threshold
is lowered during the power-on period to allow for a “softer”
start-up, thereby reducing electrical stress in the external
components. This limiting is required for their safe operation.
The output voltage is variable with ±2% precision, with a
V
VB+
supply voltage range
of 21 V to 42 V.
The exact voltage
will be set externally with a resistor (1% tolerance) divider
network. The V2_FB input voltage should be chosen, using
external voltage divider resistors, so as to provide a regulator
Table 8. Voltage Regulator Output Requirements
Voltage Name
Minimum Voltage
Maximum Voltage
Load Range
V
V1
-4.0% of Nominal
+4.0% of Nominal
10 mA Min, 500 mA Max DC
V
V2
(Note 11)
-2.0% of Nominal
+2.0% of Nominal
10 mA Min, 1.3 A Max DC
(Note 12)
Notes
11.
This voltage is programmable within a range of 10 V to 15 V via external resistors. The voltage tolerance around
any set point is ±2% of the nominal.
Maximum peak duration is 400 ms.
12.
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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| MC34920EI | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 Motor Driver RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| MC34920EIR2 | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 STD KATANA PB FREE RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| MC34921 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 5WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 5WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONNECTOR, RCPT, 5POS, 4.2MM; Series:2266(5566)S; Pitch Spacing:4.2mm; Contact Termination:Through Hole Right Angle; No. of Contacts:5; No. of Rows:1; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Brass ;RoHS Compliant: Yes |
| MC34921AE | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 DUAL PWM DC MOTOR DRIVE RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| MC34921AER2 | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 DUAL PWM DC MOTOR DRIVE RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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