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参数资料
| 型号： | IPM6210ACA |
| 厂商： | INTERSIL CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Micropower 5V, 100mA Low Dropout Linear Regulator |
| 中文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | PLASTIC, SSOP-28 |
| 文件页数： | 12/15页 |
| 文件大小： | 658K |
| 代理商： | IPM6210ACA |
12
The overcurrent protection circuit trips when the peak value
of the lower MOSFET current is higher than the one
obtained from the following equation.
where: R
CS
is a resistor from ISEN pin to PHASE pin; I
oc
is
the desired overload current trip level; r
DS(ON)
is either
r
DS(ON)
of the lower MOSFET, or the value of the optional
current sense resistor; I
th
is the threshold of the current
protection circuitry (140
μ
A).
In the linear regulator the maximum current of the
integrated power device is actively limited to 250mA that
eventually creates an undervoltage condition and sets the
fault latch.
Overvoltage Protection
During operation, severe load dump or a short of an upper
MOSFET can cause the output voltage to increase
significantly over normal operation range. When the output
exceeds the overvoltage threshold of 115% of the DAC
voltage (1.7V for PWM2), the overvoltage comparator forces
the lower gate driver high and turns the lower MOSFET on.
This will pull down the output voltage and eventually blow
the battery fuse. As soon as output voltage drops below the
threshold, OVP comparator is disengaged.
Such an OVP scheme provides soft crowbar function and
does not interfere with on-the-fly VID code changes. During
downward changes in the converter output voltage, the
condition where the OVP threshold is set before the new
value of the output voltage is reached is permissible and
harmless. Also, it does not invert output voltage when
activated, a common problem for OVP schemes with a latch.
Overvoltage protection is not provided for the linear regulator.
Shutdown
When EN (pin 20) is pulled down, the chip is disabled and
enters a low-current state. Both high-side and low-side gate
drivers are turned off. This control scheme produces no
negative output voltage at shutdown, as shown in Figure 11.
A rising edge on EN clears the fault latch.
Thermal Shutdown
The chip incorporates an over temperature protection circuit
that shuts all the outputs down when the die temperature of
150
o
C is reached. Normal operation restores at die
temperatures below 125
o
C through the full soft-start cycle.
Design Procedure and Component
Selection Guidelines
As an initial step, define operating voltage range, minimum
and maximum load currents for each controller.
Output Inductor Selection
The minimum practical output inductor value is the one that
keeps inductor current just on the boundary of continuous
conduction at some minimum load. The industry standard
practice is to choose the minimum current somewhere from
10% to 25% of the nominal current. At light load, IPM6210A
PWM controllers automatically switch to a hysteretic mode of
operation to sustain high efficiency. It is suggested that
transition to hysteretic mode occur before inductor current
becomes discontinuous. The following equations help to
choose proper value of the output filter inductor.
I
2xI
min
Output Capacitor Selection
An output capacitor serves two major functions in a switching
power supply. Along with an inductor it filters the sequence of
pulses produced by the switcher and supply the load transient
currents. The filtering requirements are a function of the
switching frequency and the ripple current allowed, and are
usually easy to satisfy in high frequency converters.
The load transient requirements are a function of the slew
rate (di/dt) and the magnitude of the transient load current.
Modern microprocessors produce transient load rates in
excess of 10A/
μ
s. High frequency ceramic capacitors placed
beneath the processor socket initially supply the transient
and reduce the slew rate seen by the bulk capacitors. The
bulk capacitor values are generally determined by the total
allowable ESR rather than actual capacitance requirements.
High frequency decoupling capacitors should be placed as
close to the processor power pins as physically possible.
Consultwith the processormanufacturer forspecific decoupling
requirements. Use only specialized low-ESR electrolytic
capacitors intended for switching-regulator applications for the
bulk capacitors. The bulk capacitor’s ESR will determine the
I
OC
I
-------------------------------------------------
R
DSON
100
+
(
)
=
=
I
-----------------
=
L
-----------–
-------------
×
=
FIGURE 11. SHUTDOWN WAVEFORMS
1.60V
CORE
3
4
1
2
1.50V
IO
2.50V
CLK
EN
Ch1 500mV
Ch3 1.0V
Ch2 500mV
Ch4 5.0V
M1.0ms
IPM6210A
相关PDF资料 |
PDF描述 |
|---|---|
| IPM6210ACA-T | Micropower 5V, 100mA Low Dropout Linear Regulator |
| IPM6220A | Advanced Triple PWM and Dual Linear Power Controller for Portable Applications |
| IPS021 | FULLY PROTECTED POWER MOSFET SWITCH |
| IPS021S | FULLY PROTECTED POWER MOSFET SWITCH |
| IPS024G | QUAD FULLY PROTECTED POWER MOSFET SWITCH |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IPM6210ACA-T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| IPM6210CA | 制造商:Rochester Electronics LLC 功能描述:MULTI-OUTPUT SYSTEM ELECTRONICS REGULATOR FOR MOBILE PCS - Bulk |
| IPM6210CA WAF | 制造商:Intersil Corporation 功能描述: |
| IPM6210CA-T | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| IPM6220 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Advanced Triple PWM and Dual Linear Power Controller for Portable |
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