ZHCSI53A May   2018  – November 2018 LM5122ZA

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化应用示意图
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin 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 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  Undervoltage Lockout (UVLO)
      2. 7.3.2  High-Voltage VCC Regulator
      3. 7.3.3  Oscillator
      4. 7.3.4  Slope Compensation
      5. 7.3.5  Error Amplifier
      6. 7.3.6  PWM Comparator
      7. 7.3.7  Soft Start
      8. 7.3.8  HO and LO Drivers
      9. 7.3.9  Bypass Operation (VOUT = VIN)
      10. 7.3.10 Cycle-by-Cycle Current Limit
      11. 7.3.11 Clock Synchronization
      12. 7.3.12 Maximum Duty Cycle
      13. 7.3.13 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 MODE Control (Forced-PWM Mode and Diode-Emulation Mode)
      2. 7.4.2 MODE Control (Skip-Cycle Mode and Pulse-Skipping Mode)
      3. 7.4.3 Hiccup-Mode Overload Protection
      4. 7.4.4 Slave Mode and SYNCOUT
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Feedback Compensation
      2. 8.1.2 Sub-Harmonic Oscillation
      3. 8.1.3 Interleaved Boost Configuration
      4. 8.1.4 DCR Sensing
      5. 8.1.5 Output Overvoltage Protection
      6. 8.1.6 SEPIC Converter Simplified Schematic
      7. 8.1.7 Non-Isolated Synchronous Flyback Converter Simplified Schematic
      8. 8.1.8 Negative to Positive Conversion
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Timing Resistor RT
        2. 8.2.2.2  UVLO Divider RUV2, RUV1
        3. 8.2.2.3  Input Inductor LIN
        4. 8.2.2.4  Current Sense Resistor RS
        5. 8.2.2.5  Current Sense Filter RCSFP, RCSFN, CCS
        6. 8.2.2.6  Slope Compensation Resistor RSLOPE
        7. 8.2.2.7  Output Capacitor COUT
        8. 8.2.2.8  Input Capacitor CIN
        9. 8.2.2.9  VIN Filter RVIN, CVIN
        10. 8.2.2.10 Bootstrap Capacitor CBST and Boost Diode DBST
        11. 8.2.2.11 VCC Capacitor CVCC
        12. 8.2.2.12 Output Voltage Divider RFB1, RFB2
        13. 8.2.2.13 Soft-Start Capacitor CSS
        14. 8.2.2.14 Restart Capacitor CRES
        15. 8.2.2.15 Low-Side Power Switch QL
        16. 8.2.2.16 High-Side Power Switch QH and Additional Parallel Schottky Diode
        17. 8.2.2.17 Snubber Components
        18. 8.2.2.18 Loop Compensation Components CCOMP, RCOMP, CHF
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 接收文档更新通知
    2. 11.2 社区资源
    3. 11.3 商标
    4. 11.4 静电放电警告
    5. 11.5 术语表
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

6.5 Electrical Characteristics

Unless otherwise specified, these specifications apply for –40°C ≤ TJ ≤ +125°C, VVIN = 12 V, VVCC = 8.3 V, RT = 20 kΩ, no load on LO and HO. Typical values represent the most likely parametric norm at TJ = 25°C and are provided for reference purposes only.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VIN SUPPLY
ISHUTDOWN VIN shutdown current VUVLO = 0 V 9 17 µA
IBIAS VIN operating current (exclude the current into RT resistor) VUVLO = 2 V, non-switching 4 5 mA
VCC REGULATOR
VCC(REG) VCC regulation No load 6.9 7.6 8.3 V
VCC dropout (VIN to VCC) VVIN = 4.5 V, no external load 0.25 V
VVIN = 4.5 V, IVCC = 25 mA 0.28 0.5 V
VCC sourcing current limit VVCC = 0 V 50 62 mA
IVCC VCC operating current (exclude the current into RT resistor) VVCC = 8.3 V 3.5 5 mA
VVCC = 12 V 4.5 8 mA
VCC undervoltage threshold VCC rising, VVIN = 4.5 V 3.9 4 4.1 V
VCC falling, VVIN = 4.5 V 3.7 V
VCC undervoltage hysteresis 0.385 V
UNDERVOLTAGE LOCKOUT
UVLO threshold UVLO rising 1.17 1.2 1.23 V
UVLO hysteresis current VUVLO = 1.4 V 7 10 13 µA
UVLO standby enable threshold UVLO rising 0.3 0.4 0.5 V
UVLO standby enable hysteresis 0.1 0.125 V
MODE
Diode emulation mode threshold MODE rising 1.2 1.24 1.28 V
Diode emulation mode hysteresis 0.1 V
Default MODE voltage 145 155 170 mV
Default skip cycle threshold COMP rising, measured at COMP 1.290 V
COMP falling, measured at COMP 1.245 V
Skip cycle hysteresis Measured at COMP 40 mV
ERROR AMPLIFIER
VREF FB reference voltage Measured at FB, VFB = VCOMP 1.188 1.2 1.212 V
FB input bias current VFB = VREF 5 nA
VOH COMP output high voltage ISOURCE = 2 mA, VVCC = 4.5 V 2.75 V
ISOURCE = 2 mA, VVCC = 12 V 3.4 V
VOL COMP output low voltage ISINK = 2 mA 0.25 V
AOL DC gain 80 dB
fBW Unity gain bandwidth 3 MHz
Slave mode threshold FB rising 2.7 3.4 V
OSCILLATOR
fSW1 Switching frequency 1 RT = 20 kΩ 400 450 500 kHz
fSW2 Switching frequency 2 RT = 10 kΩ 775 875 975 kHz
RT output voltage 1.2 V
RT sync rising threshold RT rising 2.5 2.9 V
RT sync falling threshold RT falling 1.6 2 V
Minimum sync pulse width 100 ns
SYNCOUT
SYNCOUT high-state voltage ISYNCOUT = –1 mA 3.3 4.3 V
SYNCOUT low-state voltage ISYNCOUT = 1 mA 0.15 0.25 V
OPT
Synchronization selection threshold OPT rising 2 3 4 V
SLOPE COMPENSATION
SLOPE output voltage 1.17 1.2 1.23 V
VSLOPE Slope compensation amplitude RSLOPE = 20 kΩ, fSW = 100 kHz, 50% duty cycle, TJ = –40°C to 125°C 1.375 1.65 1.925 V
RSLOPE= 20 kΩ, fSW= 100 kHz, 50% duty cycle, TJ = 25°C 1.4 1.65 1.9 V
SOFT START
ISS-SOURCE SS current source VSS = 0 V 7.5 10 12 µA
SS discharge switch RDS-ON 13 Ω
PWM COMPARATOR
tLO-OFF Forced LO off-time VVCC = 5.5 V 330 400 ns
VVCC = 4.5 V 560 750 ns
tON-MIN Minimum LO on-time RSLOPE = 20 kΩ 150 ns
RSLOPE = 200 kΩ 300 ns
COMP to PWM voltage drop TJ = –40°C to 125°C 0.95 1.1 1.25 V
TJ = 25°C 1 1.1 1.2 V
CURRENT SENSE / CYCLE-BY-CYCLE CURRENT LIMIT
VCS-TH1 Cycle-by-cycle current limit threshold CSP to CSN, TJ = –40°C to 125°C 65.5 75 87.5 mV
CSP to CSN, TJ = 25°C 67 75 86 mV
VCS-ZCD Zero cross detection threshold CSP to CSN, rising 7 mV
CSP to CSN, falling 0.5 6 12 mV
Current sense amplifier gain 10 V/V
ICSP CSP input bias current 12 µA
ICSN CSN input bias current 11 µA
Bias current matching ICSP – ICSN –2.5 1 8.75 µA
CS to LO delay Current sense / current limit delay 150 ns
HICCUP-MODE RESTART
VRES Restart threshold RES rising 1.15 1.2 1.25 V
VHCP-UPPER Hiccup counter upper threshold RES rising 4.2 V
RES rising,
VVIN = VVCC = 4.5 V		 3.6 V
VHCP-LOWER Hiccup counter lower threshold RES falling 2.15 V
RES falling,
VVIN = VVCC = 4.5 V		 1.85 V
IRES-SOURCE1 RES current source1 Fault-state charging current 20 30 40 µA
IRES-SINK1 RES current sink1 Normal-state discharging current 5 µA
IRES-SOURCE2 RES current source2 Hiccup-mode off-time charging current 10 µA
IRES-SINK2 RES current sink2 Hiccup-mode off-time discharging current 5 µA
Hiccup cycle 8 Cycles
RES discharge switch RDS-ON 40 Ω
Ratio of hiccup mode off-time to restart delay time 122
HO GATE DRIVER
VOHH HO high-state voltage drop IHO = –100 mA, VOHH = VBST –VHO 0.15 0.24 V
VOLH HO low-state voltage drop IHO = 100 mA, VOLH = VHO –VSW 0.1 0.18 V
HO rise time (10% to 90%) CLOAD = 4700 pF, VBST = 12 V 25 ns
HO fall time (90% to 10%) CLOAD = 4700 pF, VBST = 12 V 20 ns
IOHH Peak HO source current VHO = 0 V, VSW = 0 V, VBST = 4.5 V 0.8 A
VHO = 0 V, VSW = 0 V, VBST = 7.6 V 1.9 A
IOLH Peak HO sink current VHO = VBST = 4.5 V 1.9 A
VHO = VBST= 7.6 V 3.2 A
IBST BST charge pump sourcing current VVIN = VSW = 9. V , VBST - VSW = 5 V 100 200 µA
BST charge pump regulation BST to SW, IBST= –70 μA,
VVIN = VSW = 9 V 		5.3 6.2 6.75 V
BST to SW, IBST = –70 μA,
VVIN = VSW = 12 V 		7 8.5 9 V
BST to SW undervoltage 2 3 3.5 V
BST DC bias current VBST – VSW = 12 V, VSW = 0 V 30 45 µA
LO GATE DRIVER
VOHL LO high-state voltage drop ILO = –100 mA, VOHL = VVCC –VLO 0.15 0.25 V
VOLL LO low-state voltage drop ILO = 100 mA, VOLL = VLO 0.1 0.17 V
LO rise time (10% to 90%) CLOAD = 4700 pF 25 ns
LO fall time (90% to 10%) CLOAD = 4700 pF 20 ns
IOHL Peak LO source current VLO = 0 V, VVCC = 4.5 V 0.8 A
VLO = 0 V 2 A
IOLL Peak LO sink current VLO = VVCC = 4.5 V 1.8 A
VLO = VVCC 3.2 A
SWITCHING CHARACTERISTICS
tDLH LO fall to HO rise delay No load, 50% to 50% 50 80 145 ns
tDHL HO fall to LO rise delay No load, 50% to 50% 60 80 105 ns
THERMAL
TSD Thermal shutdown Temperature rising 165 °C
Thermal shutdown hysteresis 25 °C
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