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參數(shù)資料
| 型號(hào)： | P95020NQG8 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132 |
| 封裝： | 10 X 10 MM, 0.85 MM HEIGHT, QFN-132 |
| 文件頁數(shù)： | 5/169頁 |
| 文件大?。?/td> | 4297K |
| 代理商： | P95020NQG8 |
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IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
102
2011 Integrated Device Technology, Inc.
Initialization and Power-Up
During device re-initialization or “cold boot”, an internal
POR disables the LED_BOOST Converter and loads the
default values into the registers. The default values are
only loaded into the registers when there is a POR event.
Table 162. LED Boost Output Current Register Defaults
FUNCTION
DEFAULT SETTING
Local Enable Bit
Disabled
Scale
High
Output Current
0.78 mA
Table 163. LED Boost Control Register Defaults
FUNCTION
DEFAULT SETTING
Clock Frequency
1 MHz
After the internal POR releases, the Global Enable bit can
be set to HIGH. Since the default value of the local
ENABLE bit is LOW, the converter will not start at this time.
To enable the converter, the local ENABLE bit is set to
HIGH by writing a “1” to the Output Current Register. The
Output Current value must be included each time the
converter is enabled or disabled. The default value for the
converter can be read and written back along with the
ENABLE bit or a different value can be written. When the
ENABLE bit is set, the LED_BOOST Converter will begin
its soft-start sequence, ending at the programmed current.
NOTE: Changes to the Output Current Register settings
can be written directly without disabling the converter.
Normal Disabling / Enabling
Setting either the Global Enable bit to LOW or the local
ENABLE bit to LOW will turn off the LED_BOOST
Converter.
The Global Enable bit’s sole purpose is to shut down the
converter into its lowest power shutdown mode. It is not
intended to be used to toggle the LED_BOOST Converter
off and on. Proper operation is only guaranteed by
toggling the ENABLE bit HIGH once the Global Enable bit
is set HIGH to take it out of low power shutdown mode.
Soft-Start
The LED BOOST uses the combination of a reduced initial
current limit setting with the slow charge of its large
internal compensation capacitor to affect a controlled
ramp of the output supply. This limits the inrush current
and consequently helps eliminate drooping in the input
supply during ramp-up
Slew Control
Slew Control forces the two sink currents to be ramped up
or down in time steps of 32 s per LSB from the previous
current setting to the newly programmed current setting. It
is important to wait until Slew Control is complete before
changing the current setting because any changes to the
programmed sink current level are ignored while Slew
Control is ramping.
LED Boost – Over-Voltage Protection
Output over-voltage protection is provided through the
LED_BOOST_VSENSE pin. If the input level of this pin
rises above 1.2V (nominal) then the error amplifier is reset
and the boost converter will re-enter soft start. The
converter will hiccup indefinitely if the over-voltage
condition remains. Persistent hiccup will indicate a real
fault condition such as an open LED string or simply that
the over-voltage trip is incorrectly set.
The over-voltage trip is set by connecting a resistor divider
between the output capacitor node and ground and to the
LED_BOOST_VSENSE pin. The resistor divider is shown
in Figure 31. The values of R1 and R2 calculated using
the following equations:
LED
IN
2
V
n
V
9
.
0
1
A
1
.
1
V
2
.
1
R
×
+
×
μ
×
=
(4)
2
IN
1
R
A
1
V
R
μ
=
(5)
LED Boost – Over-Current Limiter
The LED boost converter requires a sense resistor to be
placed between the source of the Nch MOSFET and GND.
This sense resistor is used for both current mode control
and over-current limiting.
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