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FAN5701UMP30X Arkusz danych(PDF) 6 Page - Fairchild Semiconductor

Numer części FAN5701UMP30X
Szczegółowy opis  Compact 6-LED Driver for Mobile Platforms
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5701 • Rev. 1.0.3
6
Electrical Specifications
Unless otherwise specified; VIN = 2.7V to 5.5V, TA = -40°C to +85°C, and EN = VIN. Typical values are VIN = 3.6V, TA = 25°C,
ILED = 20mA, and LED cathode terminals = 0.4V. Circuit and components are according to Figure 1.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
Power Supplies and Thermal Protection
IQ
Quiescent Supply Current
1.5x Mode, No LEDs
4.4
mA
1x Mode, No LEDs
0.7
mA
ISD
Shutdown Supply Current
EN = 0, VIN = 4.5V, TA=-40°C to +85°C
1.5
4.0
μA
VUVLO
Under-Voltage Lockout
Threshold
VIN Rising
2.55
2.70
V
VIN Falling
2.20
2.40
VUVHYST
Under-Voltage Lockout
Hysteresis
150
mV
OVP
Over-Voltage Protection
6
V
TLIMIT
Thermal Shutdown
150
°C
THYST
Thermal Shutdown Hysteresis
20
°C
LED Current Sinks
ILED
Absolute Current Accuracy
VCATHODE=0.4V, See Options for ISET
–10%
ISET
+10%
mA
ILED(MAX)
Maximum Diode Current
(3)
ILED= ISET
30
mA
ILED_MATCH LED Current Matching
(4)
VCATHODE=0.4V, ILED= ISET
0.4
3.0
%
VDTH
1x to 1.5x Gain Transition
Threshold
LED Cathode Voltage Falling
100
mV
VHR
Current Sink Headroom
(5)
ILED = 90% ILED(NOMINAL)
65
mV
Charge Pump
ROUT
Output Resistance
1.5x Mode
2.4
1x Mode
0.9
fSW
Switching Frequency
0.9
1.2
1.5
MHz
tSTART
Startup Time
VOUT = 90% of Steady State
250
μs
PWM Dimming
fPWM
PWM Dimming Frequency
tON_LED = 15µs (Minimum)
20
kHz
DPWM
PWM Duty-Cycle
fPWM = 100Hz
0.15
100.00
%
Logic Inputs (EN, PWMA, PWMB)
VIH
HIGH-Level Input Voltage
1.2
V
VIL
LOW-Level Input Voltage
0.4
V
VIMAX
Maximum Input Voltage
1.8
5.5
V
IIN
Input Bias Current
Input Tied to GND or VIN
0.01
1.00
μA
Notes:
3.
The maximum total output current for the IC should be limited to 180mA. The total output current can be split between the
two groups (IDxA = IDxB = 30mA maximum). Under maximum output current conditions, special attention must be given
to input voltage and LED forward voltage to ensure proper current regulation. See the Maximum Output Current section of
the datasheet for more information
.
4.
For the two groups of current sinks on a part (GroupA and GroupB), the following are determined: the maximum sink
current in the group (MAX), the minimum sink current in the group (MIN), and the average sink current of the group (AVG).
For each group, two matching numbers are calculated: (MAX-AVG)/ AVG and (AVG-MIN)/AVG. The largest number of the
two (worst case) is considered the matching figure for the group. The matching figure for a given part is considered to be
the highest matching figure of the two groups. The typical specification provided is the most likely norm of the matching
figure for all parts.
5.
For each Dxx pin, headroom voltage is the voltage across the internal current sink connected to that pin. VHRx = VOUT -
VLED. If headroom voltage requirement is not met, LED current regulation is compromised.


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