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| 型号： | MC34848EP |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 7/38页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR BACKLIGHT 8CH 48QFN |
| 产品变化通告： | AMPD Product Discontinuation 12/Dec/2012 |
| 标准包装： | 260 |
| 恒定电流： | 是 |
| 恒定电压： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 200kHz ~ 1.2MHz |
| 电源电压： | 2.6 V ~ 3.6 V |
| 输出电压： | 45V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN-EP（7x7） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 85°C |
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ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics (continued)
Characteristics noted under conditions V IN = 24 V, V PVCC = 12 V, V DVDD = 3.3 V, I LED = 70 mA (Local Dimming Mode);
140 mA (Scan Mode), f S = 700 kHz, f PWM = 660 Hz, GND = 0 V, unless otherwise noted. Typical values noted reflect the
approximate parameter means at T A = 25°C under nominal conditions, unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
BOOST CONVERTER
SW Output Voltage
V SW
5.8
6.0
6.2
V
CS Sense Voltage
V CS
V
R CS = 50 m Ω, I LIMIT Threshold = 3.5 A
Boost Efficiency (6)
I LOAD = 0.5 A
Boost Line Regulation
(V IN = 24 V ± 15 %, I LOAD = 0.5 A)
EFF BOOST
I OUT /V IN
-
-
-
0.175
94
0.1
-
-
-
%
%/V
Current Sense Amplifier Gain
A CSA
-
4.5
-
Slope Compensation Voltage Ramp
V SLOPE
-
0.34
-
V
LED CURRENT DRIVER
Maximum sink current
I S
mA
Local Dimming Mode
Scan Mode
-
-
-
-
82
164
Regulated Minimum voltage across drivers
V MIN
400
500
600
mV
Off-state Leakage Current, all channels
I CH_LEAK
μ A
(V CH = 45 V)
LED Current Tolerance
Channel-to-Channel/ Chip-to-Chip
I TOLERANCE
-
-1
-
-
10
+1
%
ISET pin voltage
V SET
1.252
1.265
1.277
V
Local Dimming Mode Drive Current
I LDM
mA
IL = 000
IL = 111
Scan Mode Drive Current
IS = 00000
IS = 11111
I SCAN
61.8
79.2
120.0
158.4
62.5
80
121.2
160
63.2
80.8
122.4
161.6
mA
FAULT PROTECTION
Over-temperature Threshold
O TT
140
150
160
°C
Short Failure Detection Voltage
S FDV
V
C = 00
C = 01
C = 10
C = 11
-
2.7
3.6
4.5
Disabled
3.0
4.0
5.0
-
3.3
4.4
5.5
Notes
6. Boost efficiency test is performed under the following conditions: f SW = 700 kHz, V IN = 24 V, T A = 25 ° C, V PVCC = 12 V, V DVDD = 3.3 V,
and R L = 70 Ω . The following external components are used: FDS3692 (Boost FET), FDS4675 (Q-FET), L = 22 μ H (DCR = 54 m Ω ),
C TOUT = 30 μ F, SS36-E3 (Schottky diode). The measurement does not include Q-FET losses. Note: Freescale does not assume liability,
endorse, or warrant components from external manufacturers that are referenced in circuit drawings or tables. While Freescale offers
component recommendations in this configuration, it is the customer’s responsibility to validate their application.
34848
Analog Integrated Circuit Device Data
Freescale Semiconductor
7
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