TS3404 TSC | Alldatasheet

Document overview

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Technical content

Features

— PWM buck control circuit — Operating voltage can be up to 27V — Under voltage lock out (UVLO) protection — Soft start (SS) circuit — Short circuit Protection (SCP) — Variable oscillator frequency 300KHz (max) — 1.25V voltage reference Output Pin Descriptions Name Description Output PWM Output Vcc Supply Voltage Comp. Feedback Loop Compensation FB Voltage Feedback SCP Short Circuit Protection SS Soft Start CT Timing Capacitor Gnd Ground

Applications

— LCD Monitor — xD-ROM, xDSL product — DC to DC converters in computers — Backlight inverter

Ordering Information

Part No. Operating Temp. (Ambient) Package TS3404CS SOP-8 TS3404CD -20 ~ +85 oC DIP-8 Absolute Maximum Rating Supply Voltage V CC 28 V Amplifier Input Voltage V I 20 V Collector Output Voltage V O Vcc~1.0V V Source Current I SOURCE 200 mA Sink Current I SINK 200 mA Operating Junction Temperature Range T J -20 ~ +150 oC Storage Temperature Range T STG -65 ~ +150 oC Lead Temperature 1.6mm(1/16”) from case for 10Sec. T LEAD 260 oC

TS3404 2-5 2003/12 rev. A Recommended Operating Conditions Parameter Symbol. Min. Max. Unit Supply voltage V CC 3.6 27 V Amplifier input voltage V I 1.05 1.45 V Collector output voltage V O Vcc~1.5 V Current into feedback terminal I FB 45 uA Feedback resistor R F 100 K Ω Timing capacitor C T 100 6800 pF Oscillator frequency F OSC 10 300 KHz

Electrical Characteristics

(VCC =6V, f = 200KHz, Ta =25 oC; unless otherwise specified.) Parameter Symbol Test C onditions Min Typ Max Unit Reference Comp. Connect to FB 1.225 1.25 1.275 V Ta= -20 oC ~ 25 oC - 0.1 1 Output voltage change with temperature VREF Ta= 25 oC ~ 85 oC - 0.2 1 Under voltage lock out (UVLO) Upper threshold Voltage V UT 2.9 Lower threshold voltage V LWT 2.4 Hysteresis V HT IO(REF) = 0.1mA, Ta= 25 oC 0.5 V Short circuit protection (SCP) Input threshold voltage V iT Ta= 25 oC 0.60 0.67 0.75 V Standby voltage V STB No pull up 100 130 160 mV Latched input voltage V LT No pull up 50 100 mV Input (source) current I SCP V I = 0.7V, Ta= 25 oC - 10 - 15 - 20 uA Comparator threshold voltage V CT 1.5 V Oscillator (OSC) Frequency F OSC C T = 270pF 200 KHz Standard deviation of frequency C T = 270pF 10 Frequency change with voltage ∆FOSC VCC = 3.6V ~ 20V 1 Error Amplifier Input offset voltage V IO ± 6 mV Input offset current I IO ± 100 nA Input bias current I IB VO (FB)= 1.25V 160 500 nA Common mode input voltage range VCM V CC = 3.6V ~ 20V 1.05 1.45 V Open loop voltage amplification AV R F = 200kΩ 70 80 dB Unity gain bandwidth GBW 1.5 MHz Common mode reject ratio CMRR 60 80 dB Max. output voltage V OH VREF~0.1 V Min. output voltage V OL 1 V Output (sink) current (Comp) I OI 0.5 1.6 mA Output (source) current (Comp) I OO VID = - 0.1V, VO = 1.25V - 45 - 70 uA

TS3404 3-5 2003/12 rev. A Electrical Characteristics (Continued) (VCC =6V, f = 200KHz, Ta =25 oC; unless otherwise specified.) Parameter Symbol Test C onditions Min Typ Max Unit Output section Leakage current I LEAK VO = 25V 10 uA Sink current VIN = 20V 200 mA Source current IDRV VIN= 20V 200 mA Output saturation voltage V SAT I O = 10mA 1.0 1.5 V Short circuit output current I SC V O = 6V 120 mA PWM comparator VTO CT 0.6 0.7 Input threshold voltage at f =10KHz (Comp) VT100 Maximum duty cycle 1.2 1.3 V Total device Average supply current I CCA C T = 270pF 6 10 mA Soft Start Soft start voltage V SS 2.3 V Constant charge current I SS 20 uA Functional Block Diagram

TS3404 4-5 2003/12 rev. A Typical Application Circuit Device Value Device Value C1 470uF R1 9K, 1/4W C2 10nF R2 3K, 1/4W C3 470uF R3 10K, 1/4W C4 50nF L1 33uH, 3A C5 270uF D1 SK34A C6 50nF Q1 TSM2301CX C7 220nF Remark: * SK34A: Taiwan semiconductor, Schottky 3A/40V in SMA package * TSM2301CX: Taiwan semiconductor, P-Channel MOSFET 4A/20V in SOT-23 package

TS3404 5-5 2003/12 rev. A DIP-8 Mechanical Drawing C K DG B A L M J DIP-8 DIMENSION MILLIMETERS INCHES DIM MIN MAX MIN MAX A 9.07 0.32 0.357 0.367 B 6.22 6.48 0.245 0.255 C 3.18 4.43 0.125 0.135 D 0.35 0.49 0.019 0.020 G 2.54 (typ) 0.100 (typ) J 0.29 0.31 0.011 0.012 K 3.25 3.35 0.128 0.132 L 7.75 8.00 0.305 0.315 M - 10 o - 10 o SOP-8 Mechanical Drawing C PB D K G 1 8 A 16 9 R M F SOP-8 DIMENSION MILLIMETERS INCHES DIM MIN MAX MIN MAX A 4.80 5.00 0.189 0.196 B 3.80 4.00 0.150 0.157 C 1.35 1.75 0.054 0.068 D 0.35 0.49 0.014 0.019 F 0.40 1.25 0.016 0.049 G 1.27 (typ) 0.05 (typ) K 0.10 0.25 0.004 0.009 M 0 o 7 o 0 o 7 o P 5.80 6.20 0.229 0.244 R 0.25 0.50 0.010 0.019