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  • TPS92200 具有灵活调光选项的 4V 至 30V 输入电压、1.5A 输出电流、同步降压 LED 驱动器

    • ZHCSLC6B May   2020  – January 2022 TPS92200

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  • TPS92200 具有灵活调光选项的 4V 至 30V 输入电压、1.5A 输出电流、同步降压 LED 驱动器
  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7.     Switching Characteristics
    8. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Peak-Current-Mode PWM Control
      2. 7.3.2 Setting LED Current
      3. 7.3.3 Internal Soft Start
      4. 7.3.4 Input Undervoltage Lockout
      5. 7.3.5 Bootstrap Regulator
      6. 7.3.6 Maximum Duty Cycle
      7. 7.3.7 Overcurrent Protection
        1. 7.3.7.1 High-Side MOSFET Overcurrent Protection
        2. 7.3.7.2 Low-Side MOSFET Sourcing Overcurrent Protection
        3. 7.3.7.3 Low-Side MOSFET Sinking Overcurrent Protection
      8. 7.3.8 Fault Protection
        1. 7.3.8.1 LED Open-Load Protection
        2. 7.3.8.2 LED+ and LED– Short Circuit Protection
        3. 7.3.8.3 LED+ Short Circuit to GND Protection
        4. 7.3.8.4 Sense-Resistor Open-Load Protection
        5. 7.3.8.5 Sense Resistor Short Circuit-to-GND Protection
        6. 7.3.8.6 Overvoltage Protection
        7. 7.3.8.7 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable and Disable the Device
      2. 7.4.2 TPS92200D1 PWM Dimming
      3. 7.4.3 TPS92200D1 Analog Dimming
      4. 7.4.4 TPS92200D2 Analog Dimming
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 TPS92200D1 12-V Input, 1.5-A, 2-Piece IR LED Driver With Analog Dimming
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Inductor Selection
          2. 8.2.1.2.2 Input Capacitor Selection
          3. 8.2.1.2.3 Output Capacitor Selection
            1. 8.2.1.2.3.1 Sense Resistor Selection
              1. 8.2.1.2.3.1.1 Other External Components Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 TPS92200D1 24-V Input, 1-A, 6-Piece WLED Driver With PWM Dimming
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Inductor Selection
          2. 8.2.2.2.2 Input Capacitor Selection
          3. 8.2.2.2.3 Output Capacitor Selection
            1. 8.2.2.2.3.1 Sense Resistor Selection
              1. 8.2.2.2.3.1.1 Other External Components Selection
        3. 8.2.2.3 Application Curves
      3. 8.2.3 5-V Input, 1-A, 1-Piece IR LED Driver With TPS92200D2
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
          1. 8.2.3.2.1 Inductor Selection
          2. 8.2.3.2.2 Input Capacitor Selection
          3. 8.2.3.2.3 Output Capacitor Selection
            1. 8.2.3.2.3.1 Sense Resistor Selection
              1. 8.2.3.2.3.1.1 Other External Components Selection
        3. 8.2.3.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 接收文档更新通知
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 术语表
  12. 12Mechanical, Packaging, and Orderable Information
  13. 重要声明
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DATA SHEET

TPS92200 具有灵活调光选项的 4V 至 30V 输入电压、1.5A 输出电流、同步降压 LED 驱动器

本资源的原文使用英文撰写。 为方便起见，TI 提供了译文；由于翻译过程中可能使用了自动化工具，TI 不保证译文的准确性。 为确认准确性，请务必访问 ti.com 参考最新的英文版本（控制文档）。

1 特性

  • 4V 至 30V 宽输入范围
  • 集成 150mΩ 和 90mΩ MOSFET，
    持续输出电流为 1.5A
  • 超低关断电流：1μA
  • 从负载汲取的超低输出放电电流：1μA
  • 1MHz 开关频率
  • 超大占空比高达 99%
  • 峰值电流模式，具有内部补偿
  • 灵活的调光选项：
    • TPS92200D1：具有数字输入的 PWM 调光和具有模拟输入的模拟调光
    • TPS92200D2：具有数字输入的模拟调光
  • 超低而准确的 FB 电压：99mV ±3mV
  • 全面保护特性：
    • LED 开路负载保护
    • LED+ 接地短路保护，具有自动重试功能
    • LED+ 和 LED 短路保护，具有自动重试功能
    • 传感电阻器开路负载和接地短路保护，具有自动重试功能
    • 具有自动重试功能的热关断保护
  • SOT23 (6) 封装
  • VQFN-HR (6) 封装

2 应用

  • 视频监控 IR/白光 LED 驱动器
  • 面部识别 IR LED 驱动器
  • 舞台照明 LED 驱动器
  • 一般工业和商业用照明
  • 医疗 UV LED 驱动器
  • AA 或锂离子电池充电器

3 说明

TPS92200 器件是一款具有 30V 最大输入电压的 1.5A 同步降压 LED 驱动器。通过集成高侧和低侧 NMOS 开关，TPS92200 器件以超小的解决方案尺寸提供高功率密度和高效率。TPS92200 器件使用峰值电流模式控制和全面内部补偿在各种运行条件下提供高瞬态响应性能。

TPS92200 器件支持灵活的调光方法。TPS92200D1 可实施 PWM 调光模式和模拟调光模式。在 PWM 调光模式下，LED 根据 PWM 占空比周期性地打开和关闭。该器件通过改变与 5% 至 100% 范围内的模拟输入电压电平成比例的内部基准电压来实现模拟调光模式。TPS92200D2 通过改变与 1% 至 100% 范围内的 PWM 信号输入占空比成比例的内部基准电压来实现更深层模拟调光。

在安全和保护方面，TPS92200 器件可实现全面保护，包括 LED 开路、LED+ 接地短路、LED 短路、检测电阻开路和短路以及器件热保护。

器件信息
器件型号 封装 封装尺寸（标称值）
TPS92200D1DDCR SOT-23-THIN (6) 1.60mm × 2.90mm
TPS92200D2DDCR SOT-23-THIN (6) 1.60mm × 2.90mm
TPS92200D1RXLR VQFN-HR (6) 1.50mm × 2.00mm
TPS92200D2RXLR VQFN-HR (6) 1.50mm x 2.00mm
GUID-20220103-SS0I-5RQV-SZHK-KQRTW0G9N8LR-low.gif简化版原理图

4 Revision History

Changes from Revision A (September 2021) to Revision B (January 2022)

  • 删除了 VQFN-HR 封装预发布说明Go
  • Updated ESD Ratings table with correct description for CDM testingGo

Changes from Revision * (May 2020) to Revision A (September 2021)

  • 更新了整个文档中的表格、图和交叉参考的编号格式Go
  • 添加了 VQFN-HR 封装信息Go
  • 添加了 VQFN-HR 封装信息Go
  • Add VQFN-HR package informationGo
  • Added VQFN-HR package informationGo

5 Pin Configuration and Functions

Figure 5-1 DDC Package6-Pin SOT-23-THINTop View
GUID-20210823-SS0I-S98R-WWB8-GZKSRXRWFWC7-low.gif Figure 5-2 RXL Package6-Pin VQFN-HRTop View
Table 5-1 Pin Functions
PIN TYPE(1) DESCRIPTION
NAME DDC NO. RXL NO.
BOOT 6 1 O A bootstrap capacitor is required between BOOT and SW.
FB 1 6 I LED current detection feedback
GND 3 4 G Power ground
DIM 2 5 I Dimming input. In PWM dimming mode, LED current is turned ON and OFF according to PWM duty cycle periodically (TPS92200D1). In analog dimming mode, the internal reference is proportional to the analog voltage on DIM pin (TPS92200D1) or the PWM duty input (TPS92200D2).
SW 5 2 O Switching node to external inductor
VIN 4 3 P Input supply voltage
(1) I = Input, O = Output, P = Supply, G = Ground

6 Specifications

6.1 Absolute Maximum Ratings

over operating ambient temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Input voltage range, VI IN –0.3 32 V
DIM –0.3 7 V
FB –0.3 7 V
Output voltage range, VO BOOT-SW –0.3 7 V
SW –0.3 32 V
SW (20 ns transient) –5 32 V
Operating junction temperature, TJ –40 150 °C
Storage temperature range, Tstg –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
Charged-device model (CDM), per ANSI/ESDA/JEDEC JS-002(2) ±500
(1) JEDEC document JEP155 states that 500-V HBM allows safemanufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safemanufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating ambient temperature range (unless otherwise noted)
MIN MAX UNIT
Input voltage range IN 4 30 V
DIM –0.1 6 V
FB –0.1 6 V
Output voltage range BOOT-SW –0.1 6 V
SW –0.1 30 V
Operating Junction temperature, TJ –40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) TPS92200 TPS92200 UNIT
DDC (SOT23-6) RXL (VQFN-HR-6)
6 PINS 6 PINS
RθJA Junction-to-ambient thermal resistance 123.4 136.1 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 60.5 95.3 °C/W
RθJB Junction-to-board thermal resistance 41.4 49.3 °C/W
ψJT Junction-to-top characterization parameter 12.3 4.6 °C/W
ψJB Junction-to-board characterization parameter 40.9 48.1 °C/W
(1) For more information about traditional and new thermalmetrics, see the Semiconductor and IC Package Thermal Metricsapplication report, SPRA953.

6.5 Electrical Characteristics

The electrical ratings specified in this section apply to all specifications in this document, unless otherwise noted. These specifications are interpreted as conditions that do not degrade the device parametric or functional specifications for the life of the product containing it. TJ = –40°C to +125°C, VIN = 4 V to 30 V, (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
VIN Input voltage range 4 30 V
VIN_UVLO VIN undervoltage lockout Rising VIN 3.5 3.7 3.9 V
Falling VIN 3.3 3.5 3.7 V
Hysteresis 0.2 V
ISD Shut down current from VIN VIN = 12 V, VDIM = 0 V 1 3 µA
IDISC Discharge current from SW and BOOT VIN floating, VDIM = 0 V 1 3 uA
IOP Normal operating current VDIM = 3.3 V 0.5 1 mA
DIMMING
VDIM_L Low-level input voltage 0.3 V
VDIM_H High-level input voltage 0.65 V
VANA Analog dimming range (TPS92200D1 only) 0.65 1.2 V
tDIM_ON1 DIM minimum on time to enable device (TPS92200D2 only) VDIM = 3.3 V 190 300 nS
tDIM_ON2 DIM minimum on time when PWM dimming (TPS92200D2 only) VDIM = 3.3 V 150 nS
tDIM_OFF DIM minimum off time to disable device VDIM = 0 V 36 mS
FEEDBACK AND ERROR AMPLIFIER
VFB_REF FB pin reference voltage VDIM = 3.3 V 96 99 102 mV
VFB_OVP FB pin over voltage protection threshold VDIM = 3.3 V 140 mV
VFB_DMAX FB reference voltage when maximum dimming input (TPS92200D1 only) VDIM = 1.2 V 99 mV
VFB_DMIN FB reference voltage when minimum dimming input (TPS92200D1 only) VDIM = 0.65 V 5 mV
FB reference voltage when minimum dimming duty cycle (TPS92200D2 only) DIM pin duty cycle <= 3% 1 mV
POWER STAGE
RHS High-side FET on resistance VIN ≥ 5 V 150 mΩ
RLS Low-side FET on resistance VIN ≥ 5 V 90 mΩ
CURRENT LIMIT
ILIM_HS High-side current limit 2.9 3.3 4 A
ILIM_LS_SOUR Low-side sourcing current limit 2.4 3 3.6 A
ILIM_LS_SINK Low-side sinking current limit 1.4 1.8 2.4 A
THERMAL PROTECTION
TTSD Thermal shutdown temperature 165 °C
Hysteresis 15 °C

6.6 Timing Requirements

MIN TYP MAX UNIT
Auto-Retry Timing
tRETRY_ON Auto-retry on-time 512 Cycles
tRETRY_OFF Auto-retry off-time 60 ms
SOFT START
tSS Internal soft-start time 0.5 ms

Switching Characteristics

TJ = –40°C to +125°C, VIN = 4V to 30V, (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
fsw Switching frequency 0.8 1 1.2 MHz
DMAX Maximum duty cycle 99%
tMIN_ON Minimum on time 75 100 ns
tMIN_OFF Minimum off time 65 90 ns
tMAX_ON Maximum on time 6.6 us

6.7 Typical Characteristics

VIN = 12 V, unless otherwise specified.

GUID-FD1315BD-94E2-498E-B564-AB6FE80777B2-low.gifFigure 6-1 Output Current vs Input Voltage
GUID-FBA3E78D-F5C6-4374-A5B4-52C8193350A7-low.gifFigure 6-3 Output Current vs LED Count
GUID-DE944597-C7B0-4E7E-B78C-4F871631442B-low.gifFigure 6-5 DIM Duty Cycle vs FB Voltage in Analog Dimming (for TPS92200D2)
GUID-66AD98E6-8188-4525-ABCD-57D680B2334F-low.gifFigure 6-7 VIN UVLO Threshold vs Junction Temperature
GUID-0E1E1713-914E-488F-A0ED-C5102ECF4EC4-low.gifFigure 6-9 DIM Shutdown Threshold vs Junction Temperature
GUID-04AE5AE9-D1F0-4209-97F4-179C43A7E62C-low.gifFigure 6-11 Low-Side FET On Resistance vs Junction Temperature
GUID-06A9FD3B-6F0A-425B-A246-2E01E31E59F7-low.gifFigure 6-13 Low-Side FET Source Current Limit vs Junction Temperature
GUID-31D9F664-BD08-4053-AF4F-E905D19BD63F-low.gifFigure 6-15 Efficiency at 1-A Output Current, 4.7-µH Inductor, 12-V Input Voltage
GUID-CA1617EB-EC8F-4D90-B072-2A15D441DE28-low.gifFigure 6-2 Shutdown Current vs Junction Temperature
GUID-C9E5CEF5-678D-4C2D-BFA8-01D3571872D4-low.gifFigure 6-4 DIM Voltage vs FB Voltage in Analog Dimming (for TPS92200D1)
GUID-42376B30-972E-48F3-934D-1E8FD7ADF238-low.gifFigure 6-6 Switching Frequency vs Junction Temperature
GUID-9D3775BC-2792-473C-AD23-2BF408FFD24E-low.gifFigure 6-8 DIM Enable Threshold vs Junction Temperature
GUID-A2157CD9-C794-469A-9255-34ADB68D79B3-low.gifFigure 6-10 High-side FET On Resistance vs Junction Temperature
GUID-4E3610F1-1ED7-4C6C-A908-93D59F3F9D25-low.gifFigure 6-12 High-Side FET Source Current Limit vs Junction Temperature
GUID-D38E9104-312C-4259-87BC-ECA33BD55B25-low.gifFigure 6-14 Low-Side FET Sink Current Limit vs Junction Temperature
GUID-0B541977-3853-45AA-993D-AFA04EBCA969-low.gifFigure 6-16 Efficiency at 1.5-A Output Current, 4.7-µH Inductor, 12-V Input Voltage

7 Detailed Description

7.1 Overview

The TPS92200 device is a 1.5-A synchronous buck LED driver with 30-V maximum input voltage. By integrating the high-side and low-side NMOS switches, the TPS92200 device provides high power density with high efficiency in an ultra-small solution size.

The TPS92200 device is fully internally compensated without additional external components, which enables a simple design on a limited board space. The device uses peak current mode control to regulate the LED current with high accuracy. Switching frequency is internally set to 1 MHz, allowing the use of extremely small surface-mount inductors and chip capacitors.

The TPS92200 devices support flexible dimming methods. TPS92200D1 implement both PWM and analog dimming modes. In PWM dimming mode, the LED turns on and off according to PWM duty cycle periodically. The device's analog dimming mode is achieved by changing the internal reference voltage proportional to the voltage level of the analog input in 5% to 100% range. TPS92200D2 implement deeper analog dimming by changing the internal reference voltage proportional to the duty cycle of the PWM signal input in 1% to 100% range.

For safety and protection, the TPS92200 devices implement full protections include LED open, LED+ short-to-GND, LED short, sense resistor open and short, and device thermal protection. Hiccup mode is triggered at current limit or FB pin overvoltage scenario to avoid the device overheats.

7.2 Functional Block Diagram

GUID-B172087C-C354-495F-A3B6-6D60CCDBA1F7-low.gif

7.3 Feature Description

7.3.1 Peak-Current-Mode PWM Control

The TPS92200 device uses peak-current-mode control and full internal compensation to provide high transient response performance over a wide range of operating conditions. The switching frequency is internally set to 1 MHz when the minimum off time tMIN_OFF is not triggered, thus minimizing the external inductor and capacitor size.

During each switching cycle, when the high-side power switch is turned on, the load current is sensed through the external sense resistor, RSENSE. The sensed voltage on the FB pin is compared with the internal voltage reference, VREF, through the error amplifier. The output of the error amplifier, VCOMP, is compared with the real-time current, IHS_SENSE, going through the high-side power switch. Slope compensation circuitry is implemented in the device to prevent sub-harmonic oscillations as the duty cycle increases in peak-current-control mode. When the peak value of VHS_SENSE reaches VCOMP in the PWM comparator, the high-side power switch is turned off and the low-side NMOS is turned on at the same time. The low-side power switch stays turned on until the end of the PWM cycle. Thus, by regulating the real-time peak current in each switching cycle, the device controls the load current at the target value.

GUID-A513DC93-EBD6-419B-B8FF-AC589CBE8E97-low.gifFigure 7-1 Error Amplifier and PWM Comparator

7.3.2 Setting LED Current

The LED current is set by the external resistor between the LEDs cathode and GND. Because the FB pin voltage reference VFB_REF is fixed at 99 mV, the sensing resistor can be calculated using Equation 1.

Equation 1. GUID-3374ECC1-062C-4E22-B50F-09DFE4B5061C-low.gif

7.3.3 Internal Soft Start

The TPS92200 device implements the internal soft-start function. The VREF ramps smoothly during the soft-start period. The internal soft-start period is set as tSS, 0.5 ms typically.

7.3.4 Input Undervoltage Lockout

The device implements internal Undervoltage Lockout (UVLO) circuitry on the IN pin. The device is disabled when the IN pin voltage falls below the internal IN UVLO threshold, 3.5-V typical. The internal IN UVLO threshold has a hysteresis of 0.2-V typical.

7.3.5 Bootstrap Regulator

The TPS92200 integrates a bootstrap regulator inside, and requires an external capacitor between the BOOT and SW pins to provide the gate driver voltage for the high-side power switch. TI recommends a 0.1-µF ceramic capacitor with an X7R or X5R dielectric because of the stable characteristics over temperature and voltage.

 
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