Asynchronous Boost Controller

Transcription

1 Asynchronous Boost Controller FP59 General Description The FP59 is a boost topology switching regulator control IC for battery-powered applications. The FP59 includes a totem-pole single output stage for driving NPN transistor or N-MOS, high precision reference voltage(0.5v) to compare output voltage with feedback amplifier, an internal duty time control for controlling the minimum duty cycle, programmable soft start with short circuit protection function and logic level control for operating mode or standby mode. Features Wide Supply Voltage Operating ange:.8 to 5V Precision eference Voltage: 0.5V ±% Low Current Consumption: 5.5mA in Operation Mode Low Current Consumption: μa in Standby Mode High Oscillator Frequency: MHz max. Totem-Pole Output with Adjustable ON / OFF Current (for NPN Transistors or n-channel MOSFET) Logic Level Control Stand-by Mode Function Programmable Soft Start Function (SS) Short Circuit Protection Function (SCP) Package: TSSOP-8L Applications Digital Camera PDA Portable Equipment Website: ev.. /5

2 FP59 Function Block Diagram VCC OSC eference voltage supply 0.6V Sawtooth wave oscillator.5v 0.V 0.V OUT FB V 6k Error Amp. 500 PWM - Comp DTC 0.6V Output drive control circuit 0.V 0k COMP Soft Start SCP GND SCP B / CTL Website: ev.. /5

3 FP59 Pin Descriptions 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 B / 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 esistor to this pin for Frequency Adjustment COMP 8 O Error Amplifier Compensation Output Marking Information TSSOP-8L FP59 9Fa-86L Halogen Free Lot Number Internal ID 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 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 Website: ev.. /5

4 FP59 Ordering Information Part Number Operating Temperature Package MOQ Description FP59BW-LF -0 C ~ +85 C TSSOP-8L 500EA Tape & eel Absolute Maximum atings 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 MSOP-8L, T A mw TTSOP-8L, T A mw Storage Temperature Lead Temperature SOP-8L, (soldering, 0 sec) TSSOP-8L, (soldering, 0 sec) MSOP-8L, (soldering, 0 sec) Suggested I e-flow Soldering Curve Website: ev.. 4/5

5 FP59 ecommended 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 UPPE...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 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 T =.0kΩ, C T =70pF, V FB =0.8V 85 % T A = -0 to 85 0 % Standby Current I STANDBY Pin 4 is open or =V CC μa Average Current Consumption I AVE 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 SOUCE V COMP =450 mv μa Output Sink Current I SINK V COMP =450 mv 4 40 μa Website: ev.. 5/5

6 FP59 Output Section Output High Voltage Parameter Symbol Test Conditions Min. Typ. Max. Unit Output Saturation Voltage V OH B =90Ω, I O =-5mA.0. V V OH B =750Ω, I O =-0mA, V CC =.8V V V OL B =90Ω, I O =5mA V V OL B =750Ω, I O =0mA, V CC =.8V V Output Source Current I OSOUCE B =90Ω, Vo=0.9V ma Output Sink Current I OSINK B =90Ω, Vo=0.V ma Internal Pull-Down esistor O kω Output Current Setting / Control Section Pin Voltage V B B =90Ω V Input Off Condition I OFF -0 0 μa Input On Condition I ON -45 μa Pin Current ange I B ma Website: ev.. 6/5

7 Typical Operating Characteristics (V CC =V, T A = 5 C, unless otherwise noted) 0 Supply Voltage vs. Supply Current TA=5 B=90Ω..0 FP59 Supply Voltage vs. InputThreshold Voltage TA= Supply Voltage Vcc(V) Supply Voltage Vcc(V) Figure Figure 0 0 Ambient temperature vs. Input threshod voltage variation ratio Vcc =V..0 High Level Output Vcc=V B=90 Ω TA= Ambient Temperature TA ( ) Figure High Level Output Current Iout(mA) Figure 4 Low level output B / CTL pin Current vs. Output Source Current Vcc=V B=90 TA= Vcc=V V OUT =0.9V TA= Low level output current Iout (ma) Figure B / CTL pin current IB (ma) Figure 6 Website: ev.. 7/5

8 FP59 Website: ev.. 8/5

9 FP59 Function Description Voltage eference A.5V regulator operating from V CC is used to power the FP59 internal circuitry. An internal resistive divider provides 0.5V reference for the error amplifier, Soft-start (0.9V typ.) and SCP (0.8V typ.) 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 equation (see figure): V OUT 0.5 V OUT Error Amplifier 6K 0.5V 500 FP59 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 FP59 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 0.6V. The PWM comparator compares the oscillator voltage with error amplifier output voltage, internal maximum duty control voltage (0.6V typ.) and soft start setting voltage. When the sawtooth wave voltage is lower than all of above three-output voltage, the output of FP59 is high (Turn on external NPN transistor or NMOS). Website: ev.. 9/5

10 FP59 Under Voltage Lockout (UVLO) The under voltage lockout circuits turn the output off 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 ms = 0.5 C μf The short circuit protection is triggered when a heavy loading makes output voltage drop and error amplifier output (COMP pin) is larger than V POS (0.9V typ.). The SS pin capacitor will be charged to the SCP threshold voltage (0.8V typ.), then FP59 output is disabled (internal pull-low) and the capacitor is discharged to low. The time of short circuit protection is: Tscp ms [ ] [ ] = 0.8 C μf Output Transistor The FP59 has a totem-pole transistor with a 40mA source/sink current capability to drive an external NPN transistor or NMOS directly. The driving current capability depends on a resistor that is connected to B / CTL pin (Pin4) of FP59. (see figure ) Figure Output Transistor Driving Control Circuit Website: ev.. 0/5

11 FP59 B / CTL pin can also use to control the output of FP59 for disable or enable function of system. Control Pin Q B / CTL Pin Output Transistor Function Mode Low Off Open Disable Stand-by High On Bias Current Enable Operation Website: ev.. /5

12 FP59 Application Information Vin V L 0uH D Vout 9V/0.5A C7 0uF IC FB SCP VCC COMP OSC GND 4 5 B/CTL OUT C 0.uF 0 Q NPN SM40A Q AP06GN 0k C 0.uF 5k C8 0.uF C 0uF CA 0.uF C5 0.uF 4 90 Q4 NPN FP59 5.9k C6 0pF PNP Q5 6 k Vin ON/OFF Socket SW 7 4.7k Figure4 DC V to DC 9V Boost Converter Circuit Vin 9~4V L uh Cs D Vout V/A uf S55 C7 0uF A k DA 0V QA NPN CA uf C5 0.uF 4 90 Q4 NPN IC FB SCP VCC FP59 COMP OSC GND 4 5 B/CTL OUT k C6 470pF C 0.uF 0 Q NPN Q5 PNP Q AP9974AGH L uh 0k C 0.uF 46k 6 k C0 0uF C4 470uF Vin ON/OFF Socket SW 7 4.7k Figure5 DC 9V~4V to DC V SEPIC Converter Circuit Website: ev.. /5

13 V8 5V+ FP59 Vout C6 uf Q 7 C5 uf C 0.uF D BAT54S/SOT_0 D C 0.uF BAT54S/SOT_0 C uf Q NPN BEC 6 D C4 uf 4 Q MOSFET P 5 Vout 8 D4 TL4 TL4 C8 uf 9 Q4 Vin L uh D5 SCD4 L uh Vout C9 uf NPN 0 IC FB COMP 8 Vot Socket Vout CON Vot Socket Vout Vin Socket Vin CON Vot Socket Vout C 0uF/6.V C6 0.uF C7 0.uF SCP VCC OSC GND B/CTL OUT 4 FP59 k 6 k Q6 NPN 904 C7 470pF C0 0.uF 0 Q5 MOSFET N GDS C 00uF 5k % C 5 k % C4 0.uF C5 00uF CON CON4 ON/OFF Socket Vin 7 4.7k SW Figure6 Charge Pump DC-DC Converter Circuit 9 V 56K.8K FB 0 V.K K 5.K (9+8)=7.48* 0.66*(8+9)=(0+) D BAT54HT V L uh +5V + C8 C9 00uF/5V 47uF/6V +VCC F L 8uH 4 T 6 D L uh FUSE C 04 C 0uF + U 7 D6 8. C7 470pF D4 BAT54CLT V + C0 00uF/6V L4 uh +.V + C 47uF/6V C4 0.47uF SCP 5 0 CTL 8 FB COMP 7 SCP Cosc 6 VCC GND 4 5 CTL OUT FP59 COMP C5 0.uF 6 0 C6 Q AP04 CLS 0 BAT54CLT V4 D5 BAT54HT C4 + C 00uF/6V L5 uh -7.5V C5 + C 47uF/6V ON / OFF K C6 nf 0K Q N904 4 C 70pF K + 00uF/6V + 47uF/6V Figure7 Flyback Multi-Output DC-DC Converter Circuit Website: ev.. /5

14 FP59 Timing Waveform COMP pin Voltage eference input for SCP Comparator Idle period setting voltage Oscillator waveform Soft-start setting voltage OUT pin waveform SS/SCP pin waveform Soft-start ts Output Short Circuit tpe Output Short Circuit Control pin voltage Short Circuit Protection IC Shutdown Figure8 FP59 Timing Diagram Website: ev.. 4/5

15 FP59 Package Outline 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. Website: ev.. 5/5