Non-Synchronous PWM Boost Controller

Transcription

1 Non-Synchronous PWM Boost Controller FP58 General Description The FP58 is a boost switching regulator controller IC for battery-used applications. The FP58 includes a totem-pole output stage for driving NPN transistor or N-MOS, high precision reference (0.5V) for comparing output voltage by feedback amplifier, precision maximum duty cycle control, programmable soft start with short circuit protection function and operating mode control between operation and standby mode. Features Wide Supply Voltage Operating Range:.8 to 5V Reference Voltage Precision: % Low Current Consumption: 5.5mA in Operation Mode Low Current Consumption: μa in Standby Mode High Oscillator Frequency: MHz max. Programmable Soft Start Function (SS) Short Circuit Protection Function (SCP) Totem-Pole Output with Adjustable ON / OFF Current (for NPN Transistors or n-channel MOSFET) Logic Level Control Stand-by Mode Function Package:,SOP-8L and TSSOP-8L Applications Digital Camera PDA Portable Equipment /6

2 FP58 Function Block Diagram VCC 7 OSC FB 8 COMP Reference Voltage Supply.5V 0.8V 0V. 6 KΩ + Error Amp. 0.5V 500Ω 0.V Sawtooth wave Oscillator DTC 0.6V PWM Comp. Output Drive Control circuit 0. V 0k 5 OUT Soft start & SCP Circuit 6 GND SCP 4 BR / CTL /6

3 FP58 Pin Descriptions SOP-8L TSSOP-8L Name No. I / O Description FB I Error Amplifier Inverting Input SCP I Soft Start and SCP Function Connect a Capacitor to this pin V CC P IC power supply BR / CTL 4 I Output Current Setting and Control OUT 5 O Totem-Pole Output GND 6 P IC Ground OSC 7 I Oscillator Output: Connect Capacitor and Resistor to this pin for Frequency Adjustment COMP 8 O Error Amplifier Compensation Output /6

4 FP58 Marking Information SOP-8L FP58 Halogen Free Lot Number Mass Production Version Per-Half Month Year TSSOP-8L FP58 9Fa-86L Halogen Free Lot Number Mass Production Version Per-Half Month Year Halogen Free: Halogen free product indicator Lot Number: Wafer lot number s last two digits For Example: 86TB 86 Internal ID: Internal Identification Code n Per-Half Month: Production period indicated in half month time unit For Example: January A (Front Half Month), B (Last Half Month) February C (Front Half Month), D (Last Half Month) Year: Production year s last digit 4/6

5 FP58 Ordering Information Part Number Operating Temperature Package MOQ Description FP58DR-LF -0 C ~ +85 C SOP-8L 500EA Tape & Reel FP58BWR-LF -0 C ~ +85 C TSSOP-8L 500EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Power Supply Voltage V IN 5 V Output Source Current -50 ma Output Sink Current 50 ma Allowable Power Dissipation SOP-8L, T A mw TSSOP-8L, T A mw Operating Temperature Storage Temperature Junction Breakdown Temperature T J +5 Lead Temperature SOP-8L, soldering, 0 sec +60 TSSOP-8L, soldering, 0 sec +60 IR Re-flow Soldering Curve 5/6

6 FP58 Recommended Operating Conditions Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage.8 5 V Operating Temperature DC Electrical Characteristics (V CC = +V, T A =5, unless otherwise noted) Parameter Symbol Test Conditions Min. Typ. Max. Unit Under Voltage Lock-Out Section (UVLO) Low Threshold Voltage V LOW 0.9 V Upper Threshold Voltage V UPPER...5 V Soft Start Section (SS) Input Source Current I SS V SCP = 0V µa Soft Start Threshold Voltage V SST V Short Circuit Protection Section (SCP) Input Source Current I SCP V SCP = 0V μa SCP Threshold Voltage V SCP V Oscillator Section Oscillation Frequency f R T =.0KΩ, C T =70pF KHz Frequency Change With Voltage Δf / ΔV V CC =V to 5V 0 % Frequency Change With Temperature Δf / ΔT T A = 0 to 85 5 % Idle Period Adjustment Section Maximum Duty Cycle Maximum Duty Cycle Change With Temperature Total Device Section T DUTY Δ T DUTY / ΔT R T =.0kΩ, C T =70pF, V FB =0.8V 75 % T A = -0 to 85 0 % Standby Current I STANDBY Pin 4 is open or =V CC μa Average Current Consumption I AVE R B =90Ω, V CC =0~5V ma Error Amplifier Section Input Threshold Voltage V FB V COMP =450mV mv V T Change With Voltage ΔV FB / ΔV V CC =V to 5V 5 0 mv V T Change With Temperature ΔV FB / ΔT T A = -0 to 85 % Input Bias Current I B μa Voltage Gain Av 00 V / V Frequency Bandwidth BW A V =0 db 6 MHz Output Voltage Swing Positive V POS V Output Voltage Swing Negative V NEG V Output Source Current I SOURCE V COMP =450 mv μa Output Sink Current I SINK V COMP =450 mv 4 40 μa 6/6

7 FP58 Output Section Output High Voltage Parameter Symbol Test Conditions Min. Typ. Max. Unit Output Saturation Voltage V OH R B =90Ω, I O =-5mA.0. V V OH R B =750Ω, I O =-0mA, V CC =.8V V V OL R B =90Ω, I O =5mA V V OL R B =750Ω, I O =0mA, V CC =.8V V Output Source Current I OSOURCE R B =90Ω, Vo=0.9V ma Output Sink Current I OSINK R B =90Ω, Vo=0.V ma Internal Pull-Down Resistor R O kω Output Current Setting / Control section Pin Voltage V BR R B =90Ω V Output Current Setting Resistance R B Ω Input Off Condition I OFF -0 0 μa Input On Condition I ON -45 μa Pin Current Range I BR ma 7/6

8 FP58 Typical Operating Characteristics (V CC =V, T A = 5 C, unless otherwise noted) 8/6

9 FP58 Function Description Voltage Reference A.5V regulator operating from V CC is used to power the FP58 internal circuitry. An internal resistive divider provides 0.5V reference for the error amplifier, Soft-start (typ. 0.9V) and SCP (typ. 0.8V) circuits. Error Amplifier The error amplifier compares a sample of the DC-DC converter output voltage to the 0.5V reference and generates an error signal for the PWM comparator. Output voltage of DC-DC converter is setting with the resistor divider using the following expression (see figure): V OUT R 0.5 R V OUT R Error Amplifier 6K R 0.5V 500 FP58 8 C.Figure Error Amplifier with Feedback resistance divider Oscillator The oscillator frequency can be set from 0KHz to MHz by connecting a resistor and a capacitor at OSC pin of FP58 to ground. The oscillator frequency can be determined by using the graph shown in Figure 9. The oscillator output is a sawtooth wave with a minimum value of approximately 0.V and a maximum value of approximately 0.8V. The PWM comparator compares the oscillator voltage with error amplifier output voltage, internal maximum duty control voltage (typ. 0.6V) and soft start setting voltage. When the sawtooth wave voltage is lower than all of above three-output voltage, the output of FP58 is high (Turn on external NPN transistor or NMOS). 9/6

10 FP58 Under Voltage Lockout (UVLO) The under voltage lockout circuits turn the output off and whenever the supply voltage drops too low (approximately 0.9V at 5 ) for proper operation. A hysteresis voltage of 00mV eliminates false triggering on noise and chattering. Soft Start/ Short-circuit protection (SS / SCP) The soft start is functional after power on. The interval of soft start time is determined by a capacitor connected to SCP pin (pin ). When soft start function finished, the internal soft start voltage is setting high, but external SCP pin is setting low in order to change to short circuit detection / protection function. The time of soft start is: Tss 0.5 C F The short circuit protection is functional due to a heavy loading drop and output of error amplifier (COMP pin) is maintain larger than V POS (typ. 0.9V), the capacitor is charged until SCP threshold voltage (typ. 0.8V), then FP58 output is disable (internal pull-low) and the capacitor is discharged to low. The time of short circuit protection is: Tscp 0.8 C F Output transistor The FP58 has a totem-pole transistor with a 40mA source/sink current rating to drive an external NPN transistor or NMOS directly. The driving current capability depends on a resistor R that is connected to BR/CTL pin (Pin4) of FP58. (see figure ) FP58 4 BR/CTL R Control Q Figure Output transistor driving control circuit 0/6

11 FP58 BR/CTL pin can also use to control the output of FP58 for disable or enable function of system. Control Pin Q BR/CTL Pin Output Transistor Function Mode Low Off Open Disable Stand-by High On Bias Current Enable Operation Timing Waveform COMP Pin Voltage Reference Input For Short Circuit Detection Comparator Idle Period Setting Voltage Soft Start Setting Voltage OUT Pin Waveforms SCP Pin Waveforms ON Power Supply Control SW OFF Soft Start ts Output Short Circuit tpe Output Short Circuit Short Circuit Detection FP58 Timing Diagram /6

12 FP58 Application Information Vin +V L 0uH SCD4 D Vout +4V/A IC R FB COMP R C7 0uF/5V C5 0.uF R4 k Q 904 SCP VCC BR/CTL OSC GND OUT FP58B R5 k C6 470pF C 0.07uF R 0 Q 47k % C R6 k % C8 0.uF C4 00uF/5V ON/OFF Socket Vin SW R7 4.7k Figure 4 DC.5V to DC 9V Boost Regulator Vin +.5V ~ +6V L 0uH C9 SCD4 D Vout +.V IC 0u R FB COMP R C7 0uF/5V C5 0.uF SCP VCC BR/CTL FP58B R4 k Q 904 OSC GND OUT R5 k C6 470pF C 0.07uF R 0 MOSFET N GDS Q L 0uH 5.6k % C R6 k % C8 0.uF C4 00uF/5V ON/OFF Socket Vin R7 4.7k SW Figure 5 DC.5V~DC6V to DC.V SEPIC Regulator /6

13 FP58 Vin +.V Q Pmos AP05 L uh Vout +.8V C C IC FB SCP COMP OSC uF C R 00 R C R 0k C4 0uF C5 0.uF 4 5 BR/CTL OUT R5 VCC GND FP58B 6 R4 k Q NPN 904 D SCD4 R6 499 Q NPN 904 R7.k C6 70pF.9k ON/OFF Socket Vin SW R8 4.7k Figure 6 Charge Pump DC-DC Converter Circuit Vout -6.8V C6 uf R 5.6k Q PNP BEC 906 R.k R7.k C5 uf C 0.uF D BAT54S/SOT_0 D C 0.uF BAT54S/SOT_0 C uf Q NPN BEC 904 R 90 R6 5.k D C4 uf R4 0k Q PMOS AN05 R5 0k Vout +7V R8 6.8k D4 TL4 TL4 C8 uf R9 Q4 Vin L uh D5 SCD4 L uh 00k C9 uf NPN 904 R0 5.k IC Vout +9V FB COMP 8 R R C SCP VCC OSC GND BR/CTL OUT C0 0.07uF R 0 Q NMOS AN04 C 5k % C C4 C5 0uF/6.V C6 0.uF C7 0.uF R4 k Q6 NPN 904 FP58B R6 k C7 470pF 00uF R5 k % 0.uF 00uF ON/OFF Socket Vin R7 4.7k SW Figure 7 Flyback Multi-Output DC-DC Converter Circuit /6

14 FP58 Figure 8 Flyback Multi-output DC-DC Converter Circuits 4/6

15 FP58 Package Outline SOP-8L UNIT: mm Symbols Min. (mm) Max. (mm) A A A D E H L θ 0 8 Notes:. Package dimensions are in compliance with JEDEC outline: MS-0 AA.. Dimension D does not include molding flash, protrusions or gate burrs.. Dimension E does not include inter-lead flash or protrusions. 5/6

16 FP58 TSSOP-8L Symbols Min. (mm) Max. (mm) A.00 A A D E BSC E L θ 0 8 UNIT: mm Notes:. Package dimensions are in compliance with JEDEC outline: MO-5 AA.. Dimension D does not include molding flash, protrusions or gate burrs.. Dimension E does not include inter-lead flash or protrusions 6/6