High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
Input-Referenced Buck-Boost LED Driver
The circuit in Figure 6 shows a step-up/step-down reg-
ulator. It is similar to the boost converter in Figure 5 in
that the inductor is connected to the input and the
MOSFET is essentially connected to ground. However,
rather than going from the output to ground, the LEDs
V CC
span from the output to the input. This effectively
removes the boost-only restriction of the regulator in
Figure 5, allowing the voltage across the LED to be
greater or less than the input voltage. LED current-
sensing is not ground-referenced, so a high-side cur-
rent-sense amplifier is used to measure current.
V LED
R4
ON/OFF
R8
R3
C3
V IN
7V TO 28V
R2
LED
STRING
1 TO 6
R9
14
13
12
11
10
9
8
L1
C2
C2
LEDS
C11
I.C.
OUTV
RT/SYNC
EN
MODE
CLKOUT
SGND
D1
15 OVI
N.C. 7
V LED
C10
R7
Q1
R6
16 CLP
DH 6
V CC
C9
17 EAOUT
LX 5
C1
RS+
C8
18 EAN
MAX16821A
MAX16821B
BST 4
RS-
OUT
R5
19 DIFF
MAX16821C
DL 3
20 CSN
21 CSP
N.C. 2
PGND 1
R1
SGND
22
SENSE-
23
SENSE+
24
SGND
25
IN
26
V CC
27
V DD
28
V IN
C7
C6
C5
Figure 6. Typical Application Circuit for an Input-Referred Buck-Boost LED Driver (7V to 28V Input)
14
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MAX16821EVKIT+ 制造商:Maxim Integrated Products 功能描述:HIGH-POWER SYNCHRONOUS HBLED DRIVER - Boxed Product (Development Kits)
MAX16822AASA/V+ 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
MAX16822AASA/V+T 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
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