TLD5542-1QV 英飞凌芯片 INFINEON 中文版规格书手册
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TLD5542-1QV 英飞凌芯片是一款单电感高功率降压升压控制器，具有广泛的LED正向电压范围（2 V至55 V）和宽输入电压范围（IC 4.5 V至40 V，功率4.5 V至55 V）。其开关频率范围为200 kHz至700 kHz，具有用于诊断和控制的SPI接口。在任何条件下都能实现最大效率（高达96%），能够进行恒定电流（LED）和恒定电压调节。由于快速输出放电操作，可通过单个IC驱动多个负载。此外，还具有失效安全模式（limp home function）和电磁兼容优化（特征具有自动频谱扩展）。可以监控LED和输入电流，并具有用于设备和负载的高级保护功能。增强的调光功能包括模拟和PWM调光，LED电流精度为 /- 3%。该芯片体积小巧，适合于广泛的应用。
Datasheet 14 Rev. 1.10
2019-12-11
TLD5542-1
H-Bridge DC/DC Controller with SPI Interface
Power Supply
5.1 Different Power States
TLD5542-1 has the following power states:
•SLEEP state
•IDLE state
•LIMP HOME state
•ACTIVE state
The transition between the power states is determined according to these variables after a filter time of max.
3 clock cycles:
•VIN level
•EN/INUVLO level
• IVCC level
• IVCC_EXT level
• VDD level
•LHI level
• DVCCTRL.IDLE bit state
The state diagram including the possible transitions is shown in Figure 6.
The Power-up condition is entered when the supply voltage V
VIN
exceed its minimum supply voltage threshold
V
VIN(ON)
.
SLEEP
When the device is powered it enters the SLEEP state, all outputs are OFF and the SPI registers are reset,
independently from the supply voltages at the pins VIN , VDD, IVCC, and IVCC_EXT. The current consumption
is low. Refer to parameters: I
VDD(SLEEP)
, and I
VIN(SLEEP)
.
The transition from SLEEP to ACTIVE state requires a specified time: t
ACTIVE
.
IDLE
In IDLE state, the current consumption of the device can reach the limits given by parameter I
VDD
(P_5.3.4). The
internal voltage regulator and IVCC linear regulator are working. Not all diagnosis functions are available
(refer to Chapter 10 for additional informations). In this state there is no switching activity, independently
from the supply voltages V
IN
, V
DD
, IVCC and IVCC_EXT. When V
DD
is available, the SPI registers are working and
SPI communication is possible.
Limp Home
The Limp Home state is beneficial to fulfill system safety requirements and provides the possibility to
maintain a defined current/voltage level on the output via a backup control circuitry. The backup control
circuitry turns on required loads during a malfunction of the µC. For detailed info, refer to Chapter 8.
When Limp Home state is entered, SPI registers are reset to their default values and SPI communication is
possible but only in read mode (SPI registers can be read but cannot be written). In order to regulate the
output current/voltage, it is necessary that V
IN
and IVCC_EXT are present and above their undervoltage
threshold.
ACTIVE
In active state the device will start switching activity to provide power at the output only when PWMI = HIGH.
To start the Highside gate drivers HSGD1,2 the voltage level V
BST1,2
- V
SWN1,2
needs to be above the threshold
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