View HA17451_87941.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 HA17451AP HA17451AFP Package DP-16 FP-16DA
2
HA17451AP/HA17451AFP
Pin Arrangement
CT RT NON. INV. INPUT1 INV. INPUT1 FEED BACK1 D.T.C1 OUT1 GND
1 2 3 4 5 6 7 8 (Top view)
16 15 14 13 12 11 10 9
Vref S.C.P NON. INV. INPUT2 INV. INPUT2 FEED BACK2 D.T.C2 OUT2 V CC
Pin Functions
Pin No. 1 2 3, 14 4, 13 5, 12 6, 11 7, 10 8 9 15 16 Symbols CT RT NON. INV. INPUT INV. INPUT FEEDBACK D.T.C OUT GND VCC S.C.P Vref Functions Timing capacitor Timing resistor Non-inverting input of error amp Inverting input of error amp Output of error amp Dead time control Output Ground Input voltage Short circuit protection Reference voltage output
3
4 VCC (9) CT (1) RT (2) Triangle oscillator PWM comparator1 + - - Output1 (7) OUT1 Reference voltage generation circuit + + - Vref /2 Short circuit protection comparator PWM comparator2 (10) OUT2 Output2 Vref R Undervoltage lockout + - - (6) (11) D.T.C1 D.T.C2 DEAD DEAD TIME TIME CONTROL1 CONTROL2 (8) GND
Block Diagram
Vref (16)
Error amp1
HA17451AP/HA17451AFP
NON. INV. INPUT1 (3)
+
INV. INPUT1 (4)
-
FEEDBACK1 (5)
FEEDBACK2 (12)
Error amp2
NON. INV. INPUT2 (14)
+
INV. INPUT2 (13)
-
S.C.P (15)
HA17451AP/HA17451AFP
Short-circuit Protection in HA17451A
VB Feedback line Also used as positive feedback route 5 12 (2) (voltage drop) 14 13 Error Amp2 + - Vref Low Vref High 15 R U.V.L.O. Low + + - 1.23 V
PWM Comparator2 + - - (3)
Vout (1) 10
Load
Shutdown (1)Overcurrent (2)Vout drops (3)Output turns off Positive feedback
Absolute Maximum Ratings (Ta = 25C)
Item Power supply voltage Error amplifier input voltage Collector output voltage Collector output current Power dissipation Operating temperature Storage temperature Symbol VCC VI VO IO PT Topr Tstg Rating 40 20 40 50 680 - 20 to +85 - 55 to +125 Unit V V V mA mW C C * Note
Note: This value applies to the HA17451AP at ambient temperatures up to Ta = 45C. Derate by8.3 mW/C above that point.
5
HA17451AP/HA17451AFP
Electrical Characteristics (Ta = 25C, VCC = 6 V, fOSC = 200 kHz)
Reference Section
Item Output voltage Voltage drop Line regulation Load regulation Maximum output current Reverse voltage state minimum current Symbol Vref Vdrop Line Load I OMAX I OR Min 2.40 3 18 Typ 2.50 0.2 2 1 10 Max 2.60 0.35 12.5 7.5 30 Unit V V mV mV mA A Test Conditions I O = 1 mA I O = 1 mA VCC = 3.0 to 40 V I O = 0.1 to 1 mA Vref = 0.5 V - 0.2 V < Vref < 0 V
Undervoltage Lockout Protection Section
Item High level threshold Low level threshold Hysteresis width Reset voltage Symbol Vth Vtl VHYS VR Min 2.90 2.75 100 1.5 Typ 3.15 2.98 170 1.9 Max 3.30 3.15 Unit V V mV V Test Conditions I O = 0.1 mA I O = 0.1 mA I O = 0.1 mA I O = 0.1 mA
Protection Section
Item Input threshold Input standby voltage Input source current Symbol VTPC VSTBY Ibpc Min 0.56 140 10 Typ 0.61 185 15 1.23 Max 0.66 230 20 Unit V mV A V Pins 5 and 12 No pull up Test Conditions
Comparator threshold voltage Vtc
Oscillator Section
Item Frequency Initial accuracy Voltage stability Symbol f OSC f dev f dv Min Typ 200 10 1 Max Unit kHz % % Test Conditions CT = 330 pF, RT = 10 k
6
HA17451AP/HA17451AFP
Electrical Characteristics (Ta = 25C, VCC = 6 V, fOSC = 200 kHz) (cont)
Dead Time Control Section
Item Input threshold voltage Input threshold voltage Symbol Vt0 Vt100 Min 1.20 Typ 2.05 1.45 Max 2.25 Unit V V Test Conditions f OSC = 10 kHz Duty cycle = 0% f OSC = 10 kHz Duty cycle = 100%
Error Amp Section
Item Input offset voltage Input offset current Input bias current Common mode input voltage range Open loop gain Band width Symbol VIO I IO IB VICR AV GB Min -6 -100 1.0 70 40 Vref - 0.15 0.5 Typ 160 80 2.5 60 1.6 -70 Max 6 100 500 1.45 1.0 -45 mA A VO = 1.25 V VO = 1.25 V Unit mV nA nA V dB MHz dB V Test Conditions VO (pin 5, 12) = 1.25 V VO (pin 5, 12) = 1.25 V VO (pin 5, 12) = 1.25 V VCC = 3.3 to 40 V RNF = 200 k*
Common mode rejection ratio CMRR Maximum output voltage VOM+ VOMOutput sink current Output source current Note: I OM+ I OM-
RNF is connected between pin 4 and 5 for channel 1, pin 12 and 13 for channel 2.
Output Section
Item Collector off-state current (1) Collector off-state current (2) Saturation voltage Symbol I Leak (1) I Leak (2) Vsat Min Typ 1.2 Max 10 10 2 Unit A A V Test Conditions VO = 40 V VO = 40 V VCC = Open I O = 10 mA
7
HA17451AP/HA17451AFP
PWM Comparator Section
Item Input threshold voltage Input threshold voltage Input sink current Input source current Symbol Vt0 Vt100 Isink Isource Min 1.20 0.5 Typ 2.05 1.45 1.6 -70 Max 2.25 -45 Unit V V mA A Test Conditions f OSC = 10 kHz Duty cycle = 0% f OSC = 10 kHz Duty cycle = 100% VO (pin 5, 12) = 1.25 V VO (pin 5, 12) = 1.25 V
Total Current
Item Standby current Average supply current Symbol Iccs Icca Min Typ 1.5 1.9 Max 2.0 2.6 Unit mA mA Test Conditions Output off-state RT = 10 k SCP (pin 15) = 0 V
Test Circuit
Note
1 F C T 330 pF R T 10 k 1 2 3 4 HA17451A 5 6 7 8 12 11 10 9 RL RL VCC 16 15 14 13 CPE SW 1
Output 2 Output 1 Note: Connect a phase compensating capacitor (at least 1 F) to Vref.
8
HA17451AP/HA17451AFP
Characteristic Curves
Reference Output Voltage vs. Supply Voltage
3.0 2.5 2.0 1.5 1.0 0.5 0 0 10 20 30 40 I OUT = 1 mA Ta = 25C
Reference Output Voltage Vref (V)
Reference Output Voltage Variation vs. Ambient Temperature
1.5 1.0
Variation RTC (%)
0.5 0 -0.5 -1.0 -1.5 -20
VCC = 6 V IOUT = 1 mA
0
25
50
75
85
Supply Voltage VCC (V)
Ambient Temperature Ta (C)
Drop-Out Voltage vs. Ambient Temperature
0.4 100
1 mA
A V
Open Loop Gain, Phase Variation vs. Frequency
90
Drop-Out Voltage Vdrop (V)
Open Loop Gain AV (dB)
0.3
1615 14131211 10 9 HA17451A 12 3456 78
80 70 60 50 40 30 20 10 Av
0.2
0.1
Vdrop = VCC (X) - Vref (VCC = 3 V) VCC (X) : Vref (V = 3 V) - Vref (X) > 5 mV CC
0 -20
0
25
50
75
85
0
100 1k 10 k 100 k 1M 10 M
Ambient Temperature Ta (C)
Frequency (Hz)
Output Transistor "ON" Duty (%)
20 40 60 80 100 1.00
Output Transistor "ON" Duty (%)
0
Output Transistor "ON" Duty vs. Dead Time Input Voltage (1)
0 20 40 60 80 100 1.00
Output Transistor "ON" Duty vs. Dead Time Input Voltage (2)
VCC = 6 V C T = 33000 pF R T = 39 k f OSC = 0.8 kHz Ta = 25C 1.25 1.50 1.75 2.00 2.25
VCC = 6 V C T = 330 pF R T = 10 k f OSC = 200 kHz Ta = 25C 1.25 1.50 1.75 2.00 2.25
Dead Time Input Voltage VD.T.C (V)
Dead Time Input Voltage VD.T.C (V)
Phase Variation (deg.)
VCC = 6 V Ta = 25C
9
HA17451AP/HA17451AFP
Oscillator Frequency Variation vs. Ambient Temperature
15
Oscillator Frequency vs. Timing Resistance
300
CT
CT
Oscillator Frequency (kHz)
10
Variation (%)
5 0 -5 -10 -15 -20 0 25
VCC = 6 V R T = 10 k C T = 330 pF f OSC = 200 kHz
=15
=3
0p
F
VCC = 6 V Ta = 25C
100
30
pF
CT
=3
10
300
pF
CT
=3
300
0p
F
50
75
85
1 5 10 100
Ambient Temperature Ta (C) Undervoltage lockout threshold voltage Vth, Vtl (V) Standby Current vs. Supply Voltage
7
Timing Resistance (k) Undervoltage Lockout Threshold Voltage vs. Ambient Temperature
4.0
Standby Current ICCS (mA)
6 5 4 3 2 1 0 0 10
A
16 15 14 13 12 11 10 9 HA17451A 12 3456 78
-20C Ta = 5C a =2 T 5C Ta = 8
3.5
1615 14131211 10 9 HA17451A 12 3456 78
Vth
3.0 VtI 2.5
20
30
40
Supply Voltage VCC (V)
2.0 -20
0
25
50
75
85
Ambient Temperature Ta (C)
tr, tf vs. IO
0.7 0.6 0.5
Pin 7 or Pin 10 tr tf 90%
10%
VCC = 6 V C T = 330 pF R T = 10 k Ta = 25C
tr, tf (s)
0.4 0.3
tf 0.2 0.1 0 0 10 20 30 40 50 tr
IO (mA)
10
Dead time input voltage Triangle oscillator output Error amp output 2.05 V 1.6 V 1.45 V 1.23 V output standstill Low High (off) Low (on) 0.61 V 0.19 V High Low 2.5 V Undervoltage lockout release point VCC min 3.3 V 100% High 2.5 V
Timing Waveforms
* Internal waveform timing diagram
Reference output of short-circuit protection comparator
Output transistor base waveform (internal)
Output transistor collector waveform (OUT1, OUT2)
Protection enable waveform (SCP)
Short-circuit protection comparator output (internal)
Reference voltage (Vref )
Supply voltage (VCC ) 3.15 V 2.7 V Undervoltage lockout
1.7 V 1.5 V
0V
Power-on
HA17451AP/HA17451AFP
Notes: Voltages shown in diagram are typical values.
11
HA17451AP/HA17451AFP
Typical System Configurations
* Dual-output DC/DC converter C3 + 0.47 13 k C2 + 4.7 R5 C4 R1 33 k R2 33 k 470 p 1.8 k R3 R4 18 k Step-down output circuit V IN = 9 V
Switching transistor Q1 2SB857 VOUT = 5 V C5 + 1000
L1
C1 + 2.2
16 15 14 13 12 11 10 9 HRP24 HA17451A L2 1 CT 2 3 RT 18 k 4 5 6 7 8 C7 470 p D2 HRP22 R11 30 k
R6 D1 36 k R7 12 k
2000 p
VOUT = 12 V R12 33 k R13 3.9 k C8 + 100
R10 15 k + C6 0.47
Step-up output circuit (using transistor in IC as switching element) V IN = 9 V Step-up output circuit C4 S.C.P disable R5 470 k C3 C1 + 0.47 R2 10 k R3 R1 3.9 k R4 33 k + C2 33 k 2.2 1 C
T
+ 10 Q1 R6 2.2 k
(using external transistor as switching element) L1 D1 HRP24 R7 R8 VOUT = 15 V + C5 470
470 p
2SB857
75 k 6.8 k
16 15 14 13 12 11 10 9 HA17451A 2 3 RT 18 k 4 5 6 7 8 R11 2.2 k Q2 2SB857 D2 HRP24
Inverting output circuit VOUT = -15 V C7 470 + Units R: C: F L: H
470 p C6 R10 470 k
2000 p
63 k R9
L2
R12 820 k
12
HA17451AP/HA17451AFP
Precautions
Precaution concerning inverting (negative voltage) output
Circuit diagram VIN
VCC OUT HA17451A Vref Iref INV. INPUT Negative DC output - + -VOUT
R1
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 > |VOUT | V 18 A Iref
where, R 1, R 2 : Feedback voltage resistors |VOUT |: Absolute value of negative output voltage 18 A: Minimum current with negative voltage at reference voltage pin; I OR (min)
I OR (min) -0.2 V
18 A 0V Vref
13
HA17451AP/HA17451AFP
Package Dimensions
Unit: mm
19.20 20.00 Max 16 9
7.40 Max 6.30
1 1.3
1.11 Max
8
0.51 Min
2.54 Min 5.06 Max
7.62
2.54 0.25
0.48 0.10
0.25 - 0.05 0 - 15
Hitachi Code JEDEC EIAJ Mass (reference value)
+ 0.13
DP-16 Conforms Conforms 1.07 g
Unit: mm
10.06 10.5 Max 16 9
5.5
1
*0.22 0.05 0.20 0.04
8 0.80 Max
2.20 Max
0.20 7.80 + 0.30 -
1.15 0 - 8 0.70 0.20
1.27 *0.42 0.08 0.40 0.06
0.12 M
Hitachi Code JEDEC EIAJ Mass (reference value) FP-16DA -- Conforms 0.24 g
*Dimension including the plating thickness Base material dimension
14
0.10 0.10
0.15
HA17451AP/HA17451AFP
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi's or any third party's patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party's rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi's sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi's sales office for any questions regarding this document or Hitachi semiconductor products.
Hitachi, Ltd.
Semiconductor & Integrated Circuits. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
URL
NorthAmerica : http:semiconductor.hitachi.com/ Europe : http://www.hitachi-eu.com/hel/ecg Asia (Singapore) : http://www.has.hitachi.com.sg/grp3/sicd/index.htm Asia (Taiwan) : http://www.hitachi.com.tw/E/Product/SICD_Frame.htm Asia (HongKong) : http://www.hitachi.com.hk/eng/bo/grp3/index.htm Japan : http://www.hitachi.co.jp/Sicd/indx.htm For further information write to:
Hitachi Semiconductor (America) Inc. 179 East Tasman Drive, San Jose,CA 95134 Tel: <1> (408) 433-1990 Fax: <1>(408) 433-0223 Hitachi Europe GmbH Electronic components Group Dornacher Strae 3 D-85622 Feldkirchen, Munich Germany Tel: <49> (89) 9 9180-0 Fax: <49> (89) 9 29 30 00 Hitachi Europe Ltd. Electronic Components Group. Whitebrook Park Lower Cookham Road Maidenhead Berkshire SL6 8YA, United Kingdom Tel: <44> (1628) 585000 Fax: <44> (1628) 778322 Hitachi Asia Pte. Ltd. 16 Collyer Quay #20-00 Hitachi Tower Singapore 049318 Tel: 535-2100 Fax: 535-1533 Hitachi Asia Ltd. Taipei Branch Office 3F, Hung Kuo Building. No.167, Tun-Hwa North Road, Taipei (105) Tel: <886> (2) 2718-3666 Fax: <886> (2) 2718-8180 Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower, World Finance Centre, Harbour City, Canton Road, Tsim Sha Tsui, Kowloon, Hong Kong Tel: <852> (2) 735 9218 Fax: <852> (2) 730 0281 Telex: 40815 HITEC HX
Copyright ' Hitachi, Ltd., 1998. All rights reserved. Printed in Japan.
15

▲Up To Search▲

Price & Availability of HA17451

	To Download HA17451 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .