MAX8790 Просмотр технического описания (PDF) - Maxim Integrated
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производитель
MAX8790
Maxim Integrated
MAX8790 Datasheet PDF : 23 Pages
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MAX8790
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
INPUT LEAKAGE
SHDN Leakage Current
CS Leakage Current
OSC Leakage Current
BRT, ENA Leakage Current
FSET, ISET Leakage Current
OV Leakage Current
LED CURRENT
Full-Scale FB_ Output Current
ISET High-Level Threshold
VSHDN = 26V
VCS = GND
CONDITIONS
FSET = ISET = VCC
ISET = VCC, BRT = 100%
RISET = 80kΩ to GND, BRT = 100%
RISET = 133kΩ to GND, BRT = 100%
Default setting for 20mA full-scale LED current
ISET Voltage
20% Output Current
Current Regulation Between
Strings
Minimum FB_ Regulation Voltage
Maximum FB_ Ripple
FB_ On-Resistance
FB_ Leakage Current
BRT Input Frequency
Minimum BRT Duty Cycle
FAULT PROTECTION
OV Threshold Voltage
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
VSHDN = VIN, BRT = GND, VFB_ = 15V
PLL active
FB_ Overvoltage Threshold
FAULT Shutdown Timer
Thermal-Shutdown Threshold
PHASE-LOCKED LOOP
VFB_ > 5.6V (typ)
(Note 1)
FSET High-Level Threshold
PLL disabled
BRT Frequency Capture Range
RFSET = 500kΩ
RFSET = 250kΩ
MIN TYP MAX UNITS
+35
µA
+40 +50
µA
-3
+3
µA
-1
+1
µA
-1
+1
µA
-0.1
+0.1
µA
19.40
24.25
14.40
VCC -
0.4
1.12
3.84
-1.5
-2.0
300
270
150
100
20.00
25.00
15.00
1.19
4.00
500
450
275
120
13
10
12.5
20.60
25.75
15.60
1.26
4.16
+1.5
+2.0
800
720
500
200
20
1
28
500
mA
V
V
mA
%
%
mV
mVP-P
Ω
µA
Hz
%
1.16 1.23 1.30
V
VCC + VCC + VCC +
0.20
0.6
1.45
V
50
65
80
ms
170
°C
VCC -
0.4
V
150
200
250
Hz
300
400
500
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