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Technical content
Features
Wide Supply Voltage Operating Range: 1.8 to 15V Reference Voltage Precision: 2% Low Current Consumption: 5.5mA in Operation Mode Low Current Consumption: 1 μA in Standby Mode High Oscillator Frequency: 1MHz 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
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Function Block Diagram 2 4 01 V 0.5V 500Ω 36 KΩ 0.8V 1.25V DTC 0.6V PWM Comp. 0.1V 30k 0.22 V OUT OSC SCP BR / CTL FB GND COMP VCC + Error Amp. Reference Voltage Supply Sawtooth wave Oscillator Output Drive Control circuit Soft start SCP Circuit
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Pin Descriptions SOP-8L TSSOP-8L Name No. I / O Description FB 1 I Error Amplifier Inverting Input SCP 2 I Soft Start and SCP Function Connect a Capacitor to this pin VCC 3 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
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Marking Information SOP-8L Halogen Free Lot Number Mass Production Version Per-Half Month Year FP5138 TSSOP-8L 9Fa-86L Halogen Free Lot Number Mass Production Version Per-Half Month Year FP5138 Halogen Free: Halogen free product indicator Lot Number: Wafer lot number’s last two digits For Example: 132386TB 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
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Ordering Information
Part Number Operating Temperature Package MOQ Description FP5138DR-LF -10°C ~ +85°C SOP-8L 2500EA Tape & Reel FP5138BWR-LF -10°C ~ +85°C TSSOP-8L 2500EA Tape & Reel Absolute Maximum Ratings Parameter Symbol Conditions Min. Typ. Max. Unit Power Supply Voltage V IN 15 V Output Source Current -50 mA Output Sink Current 50 mA Allowable Power Dissipation SOP-8L, TA +25≦ ℃ 570 mW TSSOP-8L, TA≦+25℃ 400 mW Operating Temperature -10 +85 ℃ Storage Temperature -55 +125 ℃ Junction Breakdown Temperature T J +125 ℃ Lead Temperature SOP-8L, soldering, 10 sec +260 ℃ TSSOP-8L, soldering, 10 sec +260 ℃ IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Recommended Operating Conditions Parameter Symbol Conditions Min. Typ. Max. Unit Supply Voltage 1.8 15 V Operating Temperature -10 +85 ℃ Parameter Symbol Test Conditions Min. Typ. Max. Unit Under Voltage Lock-Out Section (UVLO) Low Threshold Voltage VLOW 0.9 V Upper Threshold Voltage V UPPER 1.1 1.3 1.5 V Soft Start Section (SS) Input Source Current I SS V SCP= 0V -1.5 -1.0 -0.7 µA Soft Start Threshold Voltage V SST 0.8 0.9 1.0 V Short Circuit Protection Section (SCP) Input Source Current I SCP V SCP= 0V -1.5 -1.0 -0.7 μA SCP Threshold Voltage V SCP 0.7 0.8 0.9 V Oscillator Section Oscillation Frequency f R T =3.0KΩ, CT =270pF 400 500 600 KHz Frequency Change With Voltage Δf / ΔV V CC =2V to 15V 2 10 % Frequency Change With Temperature Δf / ΔT TA = 0℃ to 85℃ 5 % Idle Period Adjustment Section Maximum Duty Cycle T DUTY RT =3.0kΩ, CT =270pF, VFB =0.8V 75 % Maximum Duty Cycle Change With Temperature Δ TDUTY / ΔT TA = -10℃ to 85℃ 10 % Total Device Section Standby Current I STANDBY Pin 4 is open or =VCC 1 μA Average Current Consumption I AVE R B =390Ω, VCC =0~15V 5.0 10 mA Error Amplifier Section Input Threshold Voltage V FB V COMP =450mV 490 500 510 mV VT Change With Voltage ΔVFB / ΔV VCC =2V to 15V 5 20 mV VT Change With Temperature ΔVFB / ΔT TA = -10℃ to 85℃ 1 % Input Bias Current I B -1.0 -0.2 1.0 μA Voltage Gain Av 100 V / V Frequency Bandwidth BW A V =0 dB 6 MHz Output Voltage Swing Positive V POS 0.78 0.87 V Output Voltage Swing Negative V NEG 0.05 0.2 V Output Source Current I SOURCE V COMP =450 mV -40 -24 μA Output Sink Current I SINK V COMP =450 mV 24 40 μA
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Parameter Symbol Test Conditions Min. Typ. Max. Unit Output Section Output High Voltage VOH1 RB=390Ω, IO=-15mA 1.0 1.2 V VOH2 RB=750Ω, IO=-10mA, VCC= 1.8V 0.8 1.0 V Output Saturation Voltage VOL1 RB=390Ω, IO=15mA 0.1 0.2 V VOL2 RB=750Ω, IO=10mA, VCC= 1.8V 0.1 0.2 V Output Source Current I OSOURCE RB=390Ω, Vo=0.9V -40 -20 mA Output Sink Current I OSINK RB=390Ω, Vo=0.3V 30 40 - mA Internal Pull-Down Resistor R O 20 30 40 kΩ Output Current Setting / Control section Pin Voltage V BR RB=390Ω 0.15 0.22 0.3 V Output Current Setting Resistance R B 300 390 5000 Ω Input Off Condition I OFF -20 0 μA Input On Condition I ON -45 μA Pin Current Range I BR -1.8 -0.1 mA
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Typical Operating Characteristics (VCC=2V, TA= 25°C, unless otherwise noted)
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Function Description Voltage Reference A 1.25V regulator operating from V CC is used to power the FP5138 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 t he DC-DC converter outpu t 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 figure12): 5.02R 1R1VOUT 0.5V 36K 500 VOUT FP5138 Error Amplifier .Figure 12 Error Amplifier with Feedback resistance divider Oscillator The oscillator frequency can be set from 20KHz to 1MHz by connecting a resistor and a capacitor at OSC pin of FP5138 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 0.1V and a maximum value of approximately 0.8V. The PWM com parator 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 FP5138 is high (Turn on external NPN transistor or NMOS).
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. 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 25℃) for proper operation. A hysteresis voltage of 200mV 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 2). When soft start function finished, the internal soft start voltage is setting high, but external SCP pin is setting lo w in order to change to short circuit detection / protection function. The time of soft start is: 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 FP5138 output is disable (internal pull-low) and the capacitor is discharged to low. The time of short circuit protection is: Output transistor The FP5138 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 FP5138. (see figure 13) FP5138 BR/CTL R Control Figure 13 Output transistor driving control circuit
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. BR/CTL pin can also use to control the output of FP5138 for disable or enable function of system. 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 Power Supply Control SW ON OFF Soft Start ts Output Short Circuit tpe Output Short Circuit Short Circuit Detection FP5138 Timing Diagram Control Pin Q1 BR/CTL Pin Output Transistor Function Mode Low Off Open Disable Stand-by High On Bias Current Enable Operation
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Figure 18 Flyback Multi-output DC-DC Converter Circuits
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. Package Outline SOP-8L UNIT: mm Notes: 1. Package dimensions are in compliance with JEDEC outline: MS-012 AA. 2. Dimension “D” does not include moldi ng flash, protrusions or gate burrs. 3. Dimension “E” does not include inter-lead flash or protrusions. Symbols Min. (mm) Max. (mm) A 1.346 1.752 A1 0.101 0.254 A2 1.092 1.498 D 4.800 4.978 E 3.810 3.987 H 5.791 6.197 L 0.406 1.270 θ° 0° 8°
This datasheet contains new product information. Feeling Technology reserves the ri ghts to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product. TSSOP-8L UNIT: mm Notes: 1. Package dimensions are in compliance with JEDEC outline: MO-153 AA. 2. Dimension “D” does not include moldi ng flash, protrusions or gate burrs. 3. Dimension “E1” does not include inter-lead flash or protrusions Symbols Min. (mm) Max. (mm) A 1.200 A1 0.050 0.150 A2 0.960 1.060 D 2.900 3.100 E 6.400 BSC E1 4.300 4.500 L 0.450 0.750 θ° 0° 8°