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參數(shù)資料
| 型號： | MC33394 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 元件分類： | CAN |
| 英文描述： | Switch Mode Power Supply with Multiple Linear Regulators and High Speed CAN Transceiver(帶有多個(gè)線性穩(wěn)壓器和高速CAN收發(fā)器的開關(guān)方式電源) |
| 中文描述： | 開關(guān)電源的多線性穩(wěn)壓器和高速CAN收發(fā)器（帶有多個(gè)線性穩(wěn)壓器和高速的CAN收發(fā)器的開關(guān)方式電源） |
| 文件頁數(shù)： | 17/44頁 |
| 文件大小： | 641K |
| 代理商： | MC33394 |
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17
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
4.2.6. Switching Regulator Output Voltage Sense
(VPRE_S)
This is the switching regulator output voltage sense input.
The switcher output voltage VPRE is divided by an internal
resistor divider and compared with the bandgap reference
voltage (see Figure 4).
Refer to Section 5 Application Information for detailed
description of the switching regulator operation.
Figure 4. Switching Regulator Block Diagram
BUCK &
BOOST
CONTROL
LOGIC
CURRENT
LIMIT
SOFT
START
+
–
–
+
FEED
FORWARD
RAMP
GENERATOR
THERMAL
LIMIT
SWITCHER
OSCILLATOR
200 kHz
SWITCHER
MODE
ENABLE
Vbg
+
–
PWM
COMP
Vbg
Vbg
VPRE
COMP
BOOTSTRAP
VBAT
+
–
BOOST
COMP
Vbg
1.25 V
Vbg
1.25 V
Vbg
1.25 V
E/A
LS
DRIVER
HS
DRIVER
VPRE
VPRE
BOOT
SW1
VPRE
SW2G
VPRE_S
INV
VCOMP
40 k
11.7 k
4.3. Voltage Regulator (VDDH)
The VDDH output is a linearly regulated +5.0 +/– 0.10V
voltage supply capable of sourcing a maximum of 400 mA
steady state current from VPRE (+5.6 V) for VBAT voltages
from +4.0 V to +26.5 V (+45V transient). This regulator
incorporates current limit short circuit protection and thermal
shut down protection. The voltage output is stable under all
load/line conditions. However, the designer must consider
ripple and high frequency filtering as well as regulator
response, when choosing external components. See Table 1
in the Applications Information section for recommended
output capacitor parameters.
NOTE :
Backfeeding into the VDDH output can cause problems
during the power up sequence. Refer to the Electrical
Characteristics VDDH Regulator Section for the maximum
allowed backfed current into the VDDH output.
4.4. Tracking Voltage Regulator (VPP)
This linearly regulated +5.0 V/+3.3 V (SPI selectable)
voltage supply is capable of sourcing 150 mA of steady state
current from VPRE (+5.6 V) for VBAT voltage from +4.0 V to
+26.5 V (up to +45V transient). It tracks the VDDH or VDD3_3
output, and incorporates current limit short circuit protection
and over temperature shut down protection. This output is
intended for FLASH memory programming and includes a
dedicated enable pin (VPP_EN). The regulator enable can
also be controlled through the SPI interface but requires both
the VPP_EN pin and the SPI bit (EN_VPP bit) to be high to
enable. The selection of tracking VDDH or VDD3_3 is
controlled by the VPP_V bit in the SPI. Logic “1” selects VDDH
(default), logic “0” selects VDD3_3. The voltage output is
stable under all load/line conditions. However, the designer
must consider ripple and high frequency filtering as well as
regulator response when choosing external components. See
Table 1 for recommended output capacitor parameters.
The VPP tracking regulator should not be used in parallel
with the VDDH regulator, because this arrangement can
corrupt the proper power sequencing of the IC.
4.5. Tracking Voltage Regulator (VREFn)
The outputs of the VREF1, VREF2, VREF3 linear regulators
are 100 mA at +5.0 V. They track the VDDH output. The power
supplies are designed to supply power to sensors that are
located external to the module. These regulators may be
enabled or disabled via the SPI, which also provides fault
reporting for these regulators. They are protected for short to
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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