MAX8790A 데이터 시트보기 (PDF) - Maxim Integrated
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MAX8790A
Maxim Integrated
MAX8790A Datasheet PDF : 22 Pages
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MAX8790A
Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
Electrical Characteristics (continued)
(Circuit of Figure 1. VIN = 12V, VSHDN = VIN, CCV = 0.1μF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
INPUT LEAKAGE
SHDN Leakage Current
SHDN = 26V
+42
µA
CS Leakage Current
OSC Leakage Current
VCS = GND
+40
+50
µA
-3
+3
µA
BRT, ENA Leakage Current
-1
+1
µA
FSET, ISET Leakage Current
OV Leakage Current
FSET = ISET = VCC
-1
+1
µA
-0.1
+0.1
µA
LED CURRENT
Full-Scale FB_ Output Current
ISET High-Level Threshold
ISET = VCC, BRT = 100%
RISET = 80kΩ to GND, BRT = 100%
RISET = 133kΩ to GND, BRT = 100%
Default setting for 20mA full-scale LED current
19.40 20.00 20.60
24.25 25.00 25.75 mA
14.40 15.00 15.60
VCC -
0.4
V
ISET Voltage
1.12 1.19 1.26
V
20% Output Current
Current Regulation Between
Strings
Minimum FB_ Regulation Voltage
Maximum FB_ Ripple
FB_ On-Resistance
FB_ Leakage Current
BRT Input Frequency
ISET = VCC, BRT = 20%
ISET = VCC, BRT = 100%
ISET = VCC, BRT = 20%
RISET = 80kΩ to GND, BRT = 100%
ISET = VCC, BRT = 100%
ISET = VCC, 12.5%
ISET = VCC , COUT = 1µF, OSC = VCC (Note 1)
VFB_ = 50mV
SHDN = GND, VFB_ = 26V
SHDN = VIN, BRT = GND, VFB_ = 15V
3.84 4.00 4.16
mA
-1.5
+1.5
%
-2.0
+2.0
%
300
500
800
270
450
720
mV
150
275
500
120
200 mVP-P
13
20
Ω
1
µA
10
28
100
500
Hz
Minimum BRT Duty Cycle
PLL active
12.5
%
FAULT PROTECTION
OV Threshold Voltage
FB_ Overvoltage Threshold
FAULT Shutdown Timer
Thermal-Shutdown Threshold
VFB_ > 5.6V (typ)
(Note 1)
1.16 1.23 1.30
V
VCC + VCC + VCC +
0.20
0.6
1.45
V
50
65
80
ms
170
°C
PHASE-LOCKED LOOP
FSET High-Level Threshold
PLL disabled
VCC -
0.4
V
BRT Frequency Capture Range
RFSET = 500kΩ
RFSET = 250kΩ
150
200
250
Hz
300
400
500
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