TI LP8867C-Q1/LP8869C-Q1汽车LED驱动器技术文档
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TI的LP8867C-Q1和LP8869C-Q1是专为汽车应用设计的低电磁干扰（EMI）LED驱动器，符合AEC-Q100标准的温度等级1，能在-40°C至+125°C的温度范围内正常工作。这两个芯片主要用于汽车LCD显示屏，提供3通道和4通道的120mA LED驱动能力，具备高调光比（10000:1），确保了显示效果的细腻与均匀。每个通道的电流匹配度达到1%（典型值），允许精确控制LED亮度。
这两款驱动器集成了升压和SEPIC（单端初级电感转换器）转换器，能处理4.5V到40V的输入电压范围，并能输出高达45V的电压，满足多种LED灯串的需求。内置的3.3A开关FET可以处理较高的电流负载，开关频率可调范围为300kHz至2.2MHz，通过同步输入可以实现更高效的系统设计。为了减少EMI，它们还支持扩频技术。
保护和故障检测功能是这些驱动器的重要特性，包括故障输出信号，可以监控输入电压的过压（OVP）和欠压（UVLO）情况，以及升压部分的过压保护，确保系统的稳定性和安全性。此外，用户可以通过外部电阻设置LED电流（ISET引脚），并通过EN引脚控制使能，BRIGHTNESS引脚则用于亮度调节，RFSET引脚可以进行频率设定，而RISET用于设定电流设定电阻。
在效率方面，随着输出电流的增加，系统效率保持在较高水平，例如在VIN=16V时，当输出电流从80mA到480mA变化时，效率在68%至96%之间。效率数据还展示了不同输入电压下（如12V、8V、6V）的性能表现，提供了全面的设计参考。
总体而言，TI的LP8867C-Q1和LP8869C-Q1是为汽车LED照明系统设计的理想选择，它们提供了高效、可靠的驱动解决方案，并具备丰富的保护机制，能够适应各种汽车环境中的苛刻条件。设计师在进行实际设计时，应参考最新的英文数据表（SNVSBC7）以获取最准确的技术信息。
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LP8867C-Q1
,
LP8869C-Q1
www.ti.com.cn
ZHCSK37 –AUGUST 2019
Copyright © 2019, Texas Instruments Incorporated
(1) Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current.
Matching is the maximum difference from the average. For the constant current sinks on the part (OUTx), the following are determined:
the maximum output current (MAX), the minimum output current (MIN), and the average output current of all outputs (AVG). Matching
number is calculated: (MAX-MIN)/AVG. The typical specification provided is the most likely norm of the matching figure for all parts. LED
current sinks were characterized with 1-V headroom voltage. Note that some manufacturers have different definitions in use.
7.8 Current Sinks Electrical Characteristics
Limits apply over the full operation temperature range −40°C ≤ T
A
≤ +125°C , unless otherwise speicified, V
IN
= 12V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
LEAKAGE
Leakage current Outputs OUT1 to OUT4 , V
OUTx
= 45 V, EN = L 0.1 5 µA
I
MAX
Maximum current OUT1, OUT2, OUT3, OUT4, R
ISET
= 20 kΩ 120 mA
I
OUT
Output current accuracy I
OUT
= 100 mA −5% 5%
I
MATCH
Output current matching
(1)
I
OUT
= 100 mA, PWM duty =100% 1% 5%
V
LOW_COMP
Low comparator threshold 0.9 V
V
MID_COMP
Mid comparator threshold 1.9 V
V
HIGH_COMP
High comparator threshold 5.6 6 7 V
(1) This specification is not ensured by ATE.
7.9 PWM Brightness Control Electrical Characteristics
Limits apply over the full operation temperature range −40°C ≤ T
A
≤ +125°C , unless otherwise speicified, V
IN
= 12V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ƒ
PWM
PWM input frequency 100 20 000 Hz
t
ON/OFF
Minimum on/off time
(1)
0.5 µs
(1) This specification is not ensured by ATE.
7.10 Boost and SEPIC Converter Characteristics
Limits apply over the full operation temperature range −40°C ≤ T
A
≤ +125°C , unless otherwise speicified, V
IN
= 12V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IN
Input voltage 4.5 40 V
V
OUT
Output voltage 6 45
ƒ
SW_MIN
Minimum switching frequency Defined by R
FSET
resistor 300 kHz
ƒ
SW_MAX
Maximum switching frequency Defined by R
FSET
resistor 2 200 kHz
t
OFF
Minimum switch OFF time
(1)
ƒ
SW
≥ 1.15 MHz 55 ns
I
SW_MAX
SW current limit first triggerred 3.3 3.7 4.1 A
t
SW_MAX
SW current limit first triggerred period 1.6 s
I
SW_LIM
SW current limit 3 3.35 3.7 A
R
DSON
FET R
DSON
240 400 mΩ
f
SYNC
External SYNC frequency 300 2 200 kHz
t
SYNC_ON
External SYNC on time
(1)
150 ns
t
SYNC_OFF
External SYNC off time
(1)
150 ns
7.11 Logic Interface Characteristics
Limits apply over the full operation temperature range −40°C ≤ T
A
≤ +125°C , unless otherwise speicified, V
IN
= 12V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
LOGIC INPUT VDDIO/EN
V
IL
Input low level 0.4
V
V
IH
Input high level 1.65
I
EN
Input DC current −1 5 30 µA
Input transient current during VDDIO/EN
powering up
1.2 mA
LOGIC INPUT SYNC, PWM
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