HA17451AP/HA17451AFP Switching Regulator Controllers for DC/DC Converters Description The HA17451 is a dual-channel switching regulator controller IC. Each channel contains the basic circuits for controlling a PWM-type switching-regulator power supply. Both channels are integrated onto the same chip. Both channels can be completely synchronized, using the same oscillator output waveform. Each channel can provide output voltages for step-up, step-down, inverting, and other converter topologies. These controllers operate at voltages from 3.3 V to 40 V, making them suitable for a wide range of applications. They are ideal for chopper-type DC/DC converters. They are similar to the TL1451, but note that the HA17451A differs from the TL1451A. Functions • • • • • • • Low-dropout 2.5V voltage reference Undervoltage lockout Triangle-wave oscillator Adjustable dead-time control Error amplifier Output driver (open-collector transistor type) PWM comparator HA17451AP/HA17451AFP Features • • • • • • • • Low dropout voltage of on-chip 2.5V voltage reference: Vdrop = 0.2 V (typ) Operates throughout wide supply voltagerange: 3.3 V to 40 V Large maximum output current: 50 mA (max) Undervoltage lockout circuit High threshold voltage: 3.15 V (typ) Low threshold voltage: 2.98 V (typ) Low current drain: 1.5 mA (typ) Operates at wide range of oscillator frequencies: f OSC = 1 kHz to 300 kHz Dead time adjustable through full duty cycle range Surface-mount package (SOP16) for saving space (HA17451AFP) Ordering Information Type Name Package HA17451AP DP-16 HA17451AFP FP-16DA 2 HA17451AP/HA17451AFP Pin Arrangement CT 1 16 Vref RT 2 15 S.C.P NON. INV. INPUT1 3 14 NON. INV. INPUT2 INV. INPUT1 4 13 INV. INPUT2 FEED BACK1 5 12 FEED BACK2 D.T.C1 6 11 D.T.C2 OUT1 7 10 OUT2 GND 8 9 V CC (Top view) Pin Functions Pin No. Symbols Functions 1 CT Timing capacitor 2 RT Timing resistor 3, 14 NON. INV. INPUT Non-inverting input of error amp 4, 13 INV. INPUT Inverting input of error amp 5, 12 FEEDBACK Output of error amp 6, 11 D.T.C Dead time control 7, 10 OUT Output 8 GND Ground 9 VCC Input voltage 15 S.C.P Short circuit protection 16 Vref Reference voltage output 3 4 – INV. INPUT2 (13) S.C.P (15) + NON. INV. INPUT2 (14) FEEDBACK2 (12) Error amp2 – INV. INPUT1 (4) FEEDBACK1 (5) + Error amp1 NON. INV. INPUT1 (3) Vref (16) VCC Vref /2 + + – R Undervoltage lockout Short circuit protection comparator Reference voltage generation circuit (9) RT (2) Vref + – – Output2 Output1 (8) GND PWM comparator2 + – – PWM comparator1 (6) (11) D.T.C1 D.T.C2 DEAD DEAD TIME TIME CONTROL1 CONTROL2 Triangle oscillator CT (1) (10) OUT2 (7) OUT1 HA17451AP/HA17451AFP Block Diagram HA17451AP/HA17451AFP Short-circuit Protection in HA17451A VB ← Feedback line Also used as positive feedback route 5 + + – 1.23 V 12 (2) (voltage drop) Error Amp2 14 13 PWM Comparator2 + – – + – Vref Low Vref Vout (1) 10 Load (3) High 15 R Low U.V.L.O. Shutdown (1)Overcurrent → (2)Vout drops → (3)Output turns off Positive feedback Absolute Maximum Ratings (Ta = 25°C) Item Symbol Rating Unit Power supply voltage VCC 40 V Error amplifier input voltage VI 20 V Collector output voltage VO 40 V Collector output current IO 50 mA Power dissipation PT 680 mW Operating temperature Topr − 20 to +85 °C Storage temperature Tstg − 55 to +125 °C Note * Note: This value applies to the HA17451AP at ambient temperatures up to Ta = 45°C. Derate by8.3 mW/°C above that point. 5 HA17451AP/HA17451AFP Electrical Characteristics (Ta = 25°C, VCC = 6 V, fOSC = 200 kHz) Reference Section Item Symbol Min Typ Max Unit Test Conditions Output voltage Vref 2.40 2.50 2.60 V I O = 1 mA Voltage drop Vdrop 0.2 0.35 V I O = 1 mA Line regulation Line 2 12.5 mV VCC = 3.0 to 40 V Load regulation Load 1 7.5 mV I O = 0.1 to 1 mA Maximum output current I OMAX 3 10 30 mA Vref = 0.5 V Reverse voltage state minimum current I OR 18 µA − 0.2 V < Vref < 0 V Undervoltage Lockout Protection Section Item Symbol Min Typ Max Unit Test Conditions High level threshold Vth 2.90 3.15 3.30 V I O = 0.1 mA Low level threshold Vtl 2.75 2.98 3.15 V I O = 0.1 mA Hysteresis width VHYS 100 170 mV I O = 0.1 mA Reset voltage VR 1.5 1.9 V I O = 0.1 mA Item Symbol Min Typ Max Unit Test Conditions Input threshold VTPC 0.56 0.61 0.66 V Input standby voltage VSTBY 140 185 230 mV Input source current Ibpc 10 15 20 µA 1.23 V Pins 5 and 12 Protection Section Comparator threshold voltage Vtc No pull up Oscillator Section Item Symbol Min Typ Max Unit Test Conditions Frequency f OSC 200 kHz CT = 330 pF, RT = 10 kΩ Initial accuracy f dev 10 % Voltage stability f dv 1 % 6 HA17451AP/HA17451AFP Electrical Characteristics (Ta = 25°C, VCC = 6 V, fOSC = 200 kHz) (cont) Dead Time Control Section Item Symbol Min Typ Max Unit Test Conditions Input threshold voltage Vt0 2.05 2.25 V f OSC = 10 kHz Duty cycle = 0% Input threshold voltage Vt100 1.20 1.45 V f OSC = 10 kHz Duty cycle = 100% Item Symbol Min Typ Max Unit Test Conditions Input offset voltage VIO −6 6 mV VO (pin 5, 12) = 1.25 V Input offset current I IO −100 100 nA VO (pin 5, 12) = 1.25 V Input bias current IB 160 500 nA VO (pin 5, 12) = 1.25 V Common mode input voltage range VICR 1.0 1.45 V VCC = 3.3 to 40 V Open loop gain AV 70 80 dB RNF = 200 kΩ* Band width GB 2.5 MHz Common mode rejection ratio CMRR 40 60 dB Maximum output voltage VOM+ Vref − 0.15 V VOM- 1.0 Output sink current I OM+ 0.5 1.6 mA VO = 1.25 V Output source current I OM- −70 −45 µA VO = 1.25 V Error Amp Section Note: RNF is connected between pin 4 and 5 for channel 1, pin 12 and 13 for channel 2. Output Section Item Symbol Min Typ Max Unit Test Conditions Collector off-state current (1) I Leak (1) 10 µA VO = 40 V Collector off-state current (2) I Leak (2) 10 µA VO = 40 V VCC = Open Saturation voltage Vsat 1.2 2 V I O = 10 mA 7 HA17451AP/HA17451AFP PWM Comparator Section Item Symbol Min Typ Max Unit Test Conditions Input threshold voltage Vt0 2.05 2.25 V f OSC = 10 kHz Duty cycle = 0% Input threshold voltage Vt100 1.20 1.45 V f OSC = 10 kHz Duty cycle = 100% Input sink current Isink 0.5 1.6 mA VO (pin 5, 12) = 1.25 V Input source current Isource −70 −45 µA VO (pin 5, 12) = 1.25 V Item Symbol Min Typ Max Unit Test Conditions Standby current Iccs 1.5 2.0 mA Output off-state Average supply current Icca 1.9 2.6 mA RT = 10 kΩ SCP (pin 15) = 0 V Total Current Test Circuit Note 1 µF C T 330 pF R T 10 k Ω 1 16 2 15 3 14 4 SW 1 CPE 13 HA17451A 5 12 6 11 7 10 8 9 RL RL VCC Output 2 Output 1 Note: Connect a phase compensating capacitor (at least 1 µF) to Vref. 8 HA17451AP/HA17451AFP Reference Output Voltage vs. Supply Voltage Reference Output Voltage Variation vs. Ambient Temperature 3.0 1.5 2.5 1.0 Variation RTC (%) I OUT = 1 mA Ta = 25°C 2.0 1.5 1.0 0.5 0 –0.5 –1.0 0 10 0 20 30 –1.5 –20 40 Supply Voltage VCC (V) 25 50 75 85 Open Loop Gain, Phase Variation vs. Frequency Drop-Out Voltage vs. Ambient Temperature 100 1 mA 0.3 A 90 V Open Loop Gain AV (dB) Drop-Out Voltage Vdrop (V) 0 Ambient Temperature Ta (°C) 0.4 1615 14131211 10 9 HA17451A 12 3 456 78 0.2 0.1 0 –20 Vdrop = VCC (X) – Vref (VCC = 3 V) VCC (X) : Vref (VCC = 3 V) – Vref (X) > 5 mV 25 50 75 85 Av 60 50 φ 40 30 20 100 Output Transistor “ON” Duty vs. Dead Time Input Voltage (1) 40 60 VCC = 6 V C T = 33000 pF R T = 39 k Ω f OSC = 0.8 kHz Ta = 25°C 80 1.25 1.50 1.75 2.00 Dead Time Input Voltage VD.T.C (V) 1k 10 k 100 k 1M 10 M Frequency (Hz) 20 100 1.00 70 0 2.25 Output Transistor “ON” Duty (%) 0 VCC = 6 V Ta = 25°C 80 10 0 Ambient Temperature Ta (°C) Output Transistor “ON” Duty (%) VCC = 6 V IOUT = 1 mA 0.5 Phase Variation φ (deg.) Reference Output Voltage Vref (V) Characteristic Curves 0 Output Transistor “ON” Duty vs. Dead Time Input Voltage (2) 20 40 60 VCC = 6 V C T = 330 pF R T = 10 k Ω f OSC = 200 kHz Ta = 25°C 80 100 1.00 1.25 1.50 1.75 2.00 2.25 Dead Time Input Voltage VD.T.C (V) 9 HA17451AP/HA17451AFP Oscillator Frequency Variation vs. Ambient Temperature Oscillator Frequency vs. Timing Resistance 300 VCC = 6 V R T = 10 k Ω C T = 330 pF f OSC = 200 kHz 10 Variation (%) Oscillator Frequency (kHz) 15 5 0 –5 –10 –20 0 25 50 75 85 100 CT 30 CT F VCC = 6 V Ta = 25°C pF =3 300 10 5 pF =3 300 A 5 16 15 14 13 12 11 10 9 4 HA17451A 1 2 3 4 5 6 78 –20°C Ta = 25°C Ta = 5°C = Ta 8 3 2 1 0 0 10 20 30 40 Supply Voltage VCC (V) tr, tf vs. IO 0.5 0.4 VCC = 6 V C T = 330 pF R T = 10 k Ω Ta = 25°C 90% Pin 7 or Pin 10 10% tr tf 0.3 tf 0.2 tr 0.1 0 0 10 20 30 IO (mA) 10 100 4.0 Undervoltage Lockout Threshold Voltage vs. Ambient Temperature 3.5 1615 14131211 10 9 HA17451A 12 3 456 78 Vth 3.0 VtI 2.5 2.0 –20 0 25 50 Ambient Temperature Ta (°C) 0.7 0.6 Undervoltage lockout threshold voltage Vth, Vtl (V) Standby Current vs. Supply Voltage 6 F Timing Resistance (kΩ) 7 Standby Current ICCS (mA) 0p =3 1 Ambient Temperature Ta (°C) tr, tf (µs) =15 CT 0p –15 10 CT 40 50 75 85 Power-on 1.7 V 1.5 V Undervoltage lockout 3.15 V 2.7 V Undervoltage lockout release point 2.5 V Triangle oscillator output Notes: Voltages shown in diagram are typical values. Supply voltage (VCC ) Reference voltage (Vref ) Short-circuit protection comparator output (internal) Protection enable waveform (SCP) Output transistor collector waveform (OUT1, OUT2) Output transistor base waveform (internal) Reference output of short-circuit protection comparator Dead time input voltage Error amp output output standstill 0V VCC min 3.3 V 2.5 V Low High 0.19 V 0.61 V Low (on) High (off) Low 100% High 2.05 V 1.6 V 1.45 V 1.23 V HA17451AP/HA17451AFP Timing Waveforms • Internal waveform timing diagram 11 HA17451AP/HA17451AFP Typical System Configurations • Dual-output DC/DC converter V IN = 9 V C3 + 0.47 µ 13 k C2 R4 18 k R3 + Step-down output circuit 4.7 µ Switching transistor R5 C4 R1 33 k R2 33 k Q1 2SB857 1.8 k 470 p 16 15 14 13 12 11 10 9 C1 + HRP24 2.2 µ R6 D1 36 k HA17451A 2 CT 3 RT 18 k 2000 p 4 5 6 7 C5 + 1000 µ R7 12 k L2 1 VOUT = 5 V L1 8 C7 VOUT = 12 V D2 470 p HRP22 R10 15 k + C6 0.47 µ R12 33 k C8 + 100 µ R13 3.9 k R11 30 k Step-up output circuit (using transistor in IC as switching element) V IN = 9 V Step-up output circuit C4 (using external transistor as switching element) + 10 µ S.C.P disable Q1 R5 C3 C1 + 0.47 µ R2 10 k R1 3.9 k R3 33 k + C2 R4 33 k 2.2 µ R6 470 p 2.2 k 75 k R8 6.8 k + C5 470 µ HA17451A T 2000 p 63 k 2 3 RT 18 k 4 5 6 7 8 Inverting output circuit 470 p R11 C6 2.2 k R10 470 k Q2 2SB857 D2 L2 R9 R12 820 k 12 VOUT = 15 V HRP24 R7 2SB857 16 15 14 13 12 11 10 9 1 C 470 k L1 D1 HRP24 VOUT = –15 V C7 470 µ + Units R: Ω C: F L: H HA17451AP/HA17451AFP Precautions Precaution concerning inverting (negative voltage) output Circuit diagram VIN VCC OUT Negative DC output HA17451A Vref Iref – + INV. INPUT R1 –VOUT R2 Conditions To prevent leakage current in the IC from interfering with stable and efficient operation, choose R1 and R 2 values that satisfy the following condition: R 1 + R2 > Iref |VOUT | V 18 µA where, R 1, R 2 : Feedback voltage resistors |VOUT |: Absolute value of negative output voltage 18 µA: Minimum current with negative voltage at reference voltage pin; I OR (min) I OR (min) –0.2 V 18 µA 0V Vref 13 HA17451AP/HA17451AFP Package Dimensions Unit: mm 19.20 20.00 Max 6.30 9 1 7.40 Max 16 8 1.3 0.48 ± 0.10 7.62 2.54 Min 5.06 Max 2.54 ± 0.25 0.51 Min 1.11 Max + 0.13 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Mass (reference value) DP-16 Conforms Conforms 1.07 g Unit: mm 10.06 10.5 Max 9 1 8 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.10 ± 0.10 0.80 Max *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 5.5 16 0.20 7.80 +– 0.30 1.15 0° – 8° 0.70 ± 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension 14 Hitachi Code JEDEC EIAJ Mass (reference value) FP-16DA — Conforms 0.24 g HA17451AP/HA17451AFP Cautions 1. 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