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| 型號(hào)： | P95020ZNQGI8 |
| 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： | QFN-132 |
| 文件頁(yè)數(shù)： | 124/137頁(yè) |
| 文件大?。?/td> | 3533K |
| 代理商： | P95020ZNQGI8 |
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P95020 / Preliminary Datasheet
Revision 0.7.10
87
2010 Integrated Device Technology, Inc.
9.4.4
LED_BOOST - 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 again
changing the current setting because any changes to the programmed sink current level are ignored while Slew Control is
ramping.
9.5
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 the over-voltage condition remians. Persistent hiccup will indicate a real fault condition such as an open
LED string or simply that the the over-voltage trip is incorrectly set.
The over-voltge trip is set by tying a resistor divider between the output capactior node and gnd and to the
LED_BOOST_VSENSE pin. The resistor divder is shown in figure 14 below. The values of R1 and R2 calculated using
the following equations:
LED
IN
V
x
n
V
x
A
x
xV
V
R
9
.
0
1
.
1
2
.
1
2
2
1
R
A
V
R
IN
Equation 1
9.6
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.
9.7
LED_BOOST - APPLICATIONS INFORMATION
BOOST
CONTROLLER
SINK
CONTROLLER
VOUT ≈ n*VLED+VSINK
VIN = 3.0 to 5.5V
I_total
LED1_0
LED1_n
I2
I1
LED_BOOST_SINK1
LED_BOOST_SINK2
LED_BOOST_GATE
LED_BOOST_VSENSE
SW1
R1
R2
COUT
LED2_0
LED2_n
D1
VEXT = 3.0 to 5.5V
LED_BOOST_ISENSE
LED_BOOST_VIN
L
1
2
CIN
CEXT
089
090
092
091
094
095
CONTROL &
MONITORING
LED_BOOST_PGND2 093
R3
Figure 24
– LED_BOOST Application Schematic
VIN External Voltage is used to power the gate driver for the external NFET, SW1.
VEXT = 3.0 to 5.5V, connects externally to the inductor and system power
LED_BOOST can be set via R1 and R2 to provide a protection voltage between VEXT and 40V for protecting capacitor
COUT in case the LED strings open. This voltage should be set below the voltage rating of COUT.
The LED_BOOST converter monitors the current sense elements in the sink blocks and reduces its output voltage as
necessary to keep the headroom voltage as low as possible to minimize losses.
9.7.1
LED_BOOST - Application Specific Operating Parameters
These parameters are dependent upon external components and as such are neither specified nor tested but are included for application reference.
Unless otherwise specified, performance is measured @ VIN = 3.8V, VEXT = 5.0V and TA = 25°C
Symbol
Parameter
Min
Typ
Max
Unit
Comment
VPROTECT
Protection Voltage Range
VEXT
40
V
Select R1 and R2 to set. [See Equation 1 ]
RDS-ON
External NFET Drain-Source Resistance
0.400
VIN = 5.0V, TJ = 25°C
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