參數(shù)資料
型號(hào)： MC34920
廠商： 飛思卡爾半導(dǎo)體(中國(guó))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(dòng)器)
中文描述： 2.8歐姆（典型值）四H橋電機(jī)驅(qū)動(dòng)器（2.8歐（典型值）四魔橋電機(jī)驅(qū)動(dòng)器）
文件頁(yè)數(shù)： 20/28頁(yè)
文件大小： 813K
代理商： MC34920
34920
20
Go to: www.freescale.com
Voltage Regulators
The 34920 contains two switching voltage regulators (see
Figure 4
). Both are buck-type voltage regulators using an
internal switching MOSFET. The V1 regulator provides either
3.3 V or 5.0 V at +5%/-4% tolerance. The V2 regulator’s output
voltage, V
V2
, is programmable through the use of an external
resistor divider network. The voltage tolerance on the V
V2
output is ±2% of the nominal voltage set point. The switching
frequency of the V1 and V2 regulators is approximately
200 kHz.
The V1 and V2 regulators are designed with a dual-mode
current limit circuit. 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.
V
VB+
, the input voltage for the switching voltage regulators,
ranges from 21 V to 42 V.
To minimize the ripple current on
V
VB+
, the V1 regulator and the V2 regulator switch out of phase.
A boost voltage generator (V
b
generator), which acts as a
single-stage charge pump, provides gate drive voltage for the
switching regulators. It uses an external capacitor to store the
charge.
Output voltages V
V1
and V
V2
are set externally with a resistor
(1% tolerance) divider network. Input voltages at V1_FB and
V2_FB should be chosen to provide a feedback voltage, for the
required output regulated voltage, to equal the internal
regulator reference voltages of 2.5 V ±2%.
Figure 4. Voltage Regulator Functions
V1 Regulator
V2 Regulator
ENABLE
Oscillator
V
b
Generator
V
VB+
(21 V to 42 V)
CP2
CP1
V
b
10 nF 50 V
22
μ
F 25 V
V
V2
34920
V2_FB
V2_SWITCH
V
V1
V1_FB
V1_SWITCH
VB+
Oscillator
V
VB+
(21 V to 42 V)
VB+
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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