HIT HA17451AP, HA17451AFP Datasheet

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

• 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

= 1 kHz to 300 kHz

OSC

2

Pin Arrangement

HA17451AP/HA17451AFP

C

R

NON. INV.
INPUT1

INV.
INPUT1

FEED
BACK1

D.T.C1

OUT1

GND

1

T

2

T

3

4

5

6

7

16

15

14

13

12

11

10

8

9

Vref

S.C.P

NON. INV.
INPUT2

INV.
INPUT2

FEED
BACK2

D.T.C2

OUT2

V

CC

(Top view)

Pin Functions

Pin No. Symbols Functions

1C
2R

T

T

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
9VCCInput voltage
15 S.C.P Short circuit protection
16 Vref Reference voltage output

Timing capacitor
Timing resistor

3

HA17451AP/HA17451AFP

Block Diagram

R

(2)

TT

C

(1)

PWM

comparator1

Triangle

oscillator

OUT1

(7)

+––

Output1

OUT2
(10)

+––

PWM

comparator2

Output2

Vref

R

Under-

voltage

lockout

(11) (8)

(6)

GND

TIME

DEAD

D.T.C2D.T.C1

TIME

DEAD

CONTROL2

CONTROL1

CC

V

(9)

voltage

Reference

generation

Error amp1
(16)
Vref

4

Short circuit

protection

comparator

circuit

+

(3)

NON. INV. INPUT1

+–+

–

(5)

(4)

INV. INPUT1

FEEDBACK1

Vref /2

+

Error amp2

(12)

(14)

FEEDBACK2

NON. INV. INPUT2

–

(15)

(13)

S.C.P

INV. INPUT2

Short-circuit Protection in HA17451A

←

Feedback line

Also used as positive feedback route

HA17451AP/HA17451AFP

V

B

(2)

(voltage drop)

5

12

Error Amp2

+

14

–

13

Low

High

15

(1)Overcurrent → (2)Vout drops → (3)Output turns off

1.23 V

Vref

+
+
–

Shutdown

Positive
feedback

Absolute Maximum Ratings (Ta = 25°C)

PWM Comparator2

+
–
–

Vref

R

U.V.L.O.

(3)

Low

10

Vout

(1)

Load

Item Symbol Rating Unit Note

Power supply voltage V
Error amplifier input voltage V
Collector output voltage V
Collector output current I
Power dissipation P

CC

I

O

O

T

40 V
20 V
40 V
50 mA

680 mW *
Operating temperature Topr − 20 to +85 °C
Storage temperature Tstg − 55 to +125 °C

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, V

= 6 V, f

CC

= 200 kHz)

OSC

Reference Section

Item Symbol Min Typ Max Unit Test Conditions

Output voltage Vref 2.40 2.50 2.60 V I

= 1 mA

O

Voltage drop Vdrop  0.2 0.35 V IO = 1 mA
Line regulation Line  2 12.5 mV VCC = 3.0 to 40 V
Load regulation Load  1 7.5 mV IO = 0.1 to 1 mA
Maximum output current I
Reverse voltage state

OMAX

I

OR

3 10 30 mA Vref = 0.5 V
18 µA− 0.2 V < Vref < 0 V

minimum current

Undervoltage Lockout Protection Section

Item Symbol Min Typ Max Unit Test Conditions

High level threshold Vth 2.90 3.15 3.30 V I
Low level threshold Vtl 2.75 2.98 3.15 V IO = 0.1 mA
Hysteresis width V
Reset voltage V

HYS

R

100 170  mV IO = 0.1 mA

1.5 1.9  VI

= 0.1 mA

O

= 0.1 mA

O

Protection Section

Item Symbol Min Typ Max Unit Test Conditions

Input threshold V
Input standby voltage V

TPC

STBY

0.56 0.61 0.66 V

140 185 230 mV No pull up
Input source current Ibpc 10 15 20 µA
Comparator threshold voltage Vtc  1.23  V Pins 5 and 12

Oscillator Section

Item Symbol Min Typ Max Unit Test Conditions

Frequency f
Initial accuracy f
Voltage stability f

OSC

dev

dv

 200  kHz CT = 330 pF, RT = 10 kΩ

 10  %

 1  %

6

HA17451AP/HA17451AFP

Electrical Characteristics (Ta = 25°C, VCC = 6 V, f

= 200 kHz) (cont)

OSC

Dead Time Control Section

Item Symbol Min Typ Max Unit Test Conditions

Input threshold voltage Vt0  2.05 2.25 V f

= 10 kHz

OSC

Duty cycle = 0%

Input threshold voltage Vt100 1.20 1.45  Vf

= 10 kHz

OSC

Duty cycle = 100%

Error Amp Section

Item Symbol Min Typ Max Unit Test Conditions

Input offset voltage V
Input offset current I
Input bias current I
Common mode input voltage

IO

IO

B

V

ICR

− 6  6mVV

−100  100 nA VO (pin 5, 12) = 1.25 V
 160 500 nA VO (pin 5, 12) = 1.25 V

1.0  1.45 V VCC = 3.3 to 40 V

range
Open loop gain A

V

70 80  dB RNF = 200 kΩ
Band width GB  2.5  MHz
Common mode rejection ratio CMRR 40 60  dB
Maximum output voltage V

OM+

Vref −

V

0.15

Output sink current I
Output source current I

V

OM-

OM+

OM-

1.0

0.5 1.6  mA VO = 1.25 V

−70 −45 µAVO = 1.25 V
Note: RNF is connected between pin 4 and 5 for channel 1, pin 12 and 13 for channel 2.

(pin 5, 12) = 1.25 V

O

*

Output Section

Item Symbol Min Typ Max Unit Test Conditions

Collector off-state
current (1)

Collector off-state
current (2)

Saturation voltage Vsat  1.2 2 V IO = 10 mA

(1) 10 µAVO = 40 V

I

Leak

I

(2) 10 µAVO = 40 V

Leak

V

= Open

CC

7

HA17451AP/HA17451AFP

PWM Comparator Section

Item Symbol Min Typ Max Unit Test Conditions

Input threshold voltage Vt0  2.05 2.25 V f

Input threshold voltage Vt100 1.20 1.45  Vf

Input sink current Isink 0.5 1.6  mA VO (pin 5, 12) = 1.25 V

Input source current Isource −70 −45 µAV

Total Current

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

= 10 kHz

OSC

Duty cycle = 0%

= 10 kHz

OSC

Duty cycle = 100%

(pin 5, 12) = 1.25 V

O

S

(pin 15) = 0 V

CP

Test Circuit

Note

1 µF

C 330 pF

T

R 10 kTΩ

Note: Connect a phase compensating capacitor (at least 1 µF) to Vref.

1
2
3
4
5
6
7
8

HA17451A

16
15
14
13
12
11
10

SW

1

C

PE

9

V

R

L

R

L

Output 1Output 2

CC

8

Characteristic Curves

HA17451AP/HA17451AFP

Reference Output Voltage vs. Supply Voltage

3.0

2.5
I = 1 mA

2.0

OUT

Ta = 25°C

1.5

1.0

0.5

0

Reference Output Voltage Vref (V)

0

Drop-Out Voltage vs. Ambient Temperature

0.4

1 mA

0.3

10

Supply Voltage V

V

A

16

1

151413121110

HA17451A

2345678

9

20 30 40

(V)

CC

0.2

0.1

Vdrop = V – Vref (V = 3 V)
V : Vref (V = 3 V) – Vref (X) > 5 mV

CC (X)

CC (X) CC

CC

Drop-Out Voltage Vdrop (V)Output Transistor “ON” Duty (%)

0

–20 0 25 50 75 85

Ambient Temperature Ta (°C)

Output Transistor “ON” Duty vs.

0

Dead Time Input Voltage (1)

Reference Output Voltage Variation vs. Ambient Temperature

1.5

(%)

TC

1.0

0.5

VCC = 6 V

= 1 mA

I

OUT

0

–0.5

Variation R

–1.0

–1.5

–20 0 25 50 75 85

Ambient Temperature Ta (°C)

Open Loop Gain, Phase Variation vs. Frequency

100

90
80

(dB)

70

V

60

Av

V = 6 V

CC

Ta = 25°C

50
40

φ

30
20

Open Loop Gain A

10

0

100 1 k 10 k 100 k 1 M 10 M

Phase Variation φ (deg.)

Frequency (Hz)

Output Transistor “ON” Duty vs.

0

Dead Time Input Voltage (2)

20

40

60

80

100

1.00 1.25 1.50 1.75 2.00 2.25

Dead Time Input Voltage V

V = 6 V

CC

C = 33000 pF

T
T

OSC

D.T.C

Ω

(V)

R = 39 k
f = 0.8 kHz
Ta = 25°C

20

40

60

80

Output Transistor “ON” Duty (%)

100

1.00 1.25 1.50 1.75 2.00 2.25

Dead Time Input Voltage V

V = 6 V

CC

C = 330 pF

T

R = 10 k

T

f = 200 kHz

OSC

Ta = 25°C

(V)

D.T.C

Ω

9

HA17451AP/HA17451AFP

Oscillator Frequency Variation vs. Ambient Temperature Oscillator Frequency vs. Timing Resistance

15

10

5

0

–5

Variation (%)

V = 6 V

CC
T
T

OSC

Ω

R = 10 k
C = 330 pF
f = 200 kHz

300

100

C =150 pF

T

C = 330 pF

T

C = 3300 pF

T

10

V = 6 V

CC

Ta = 25°C

–10

–15

–20 0 25 50 75 85

Ambient Temperature Ta (°C)

Standby Current vs. Supply Voltage

7
6

(mA)

CCS

16

5
4

15 141312 11 10

HA17451A

1

2345678

3
2
1

Standby Current I

A

9

= –20°C

Ta

°C

Ta = 25

°C

= 85

Ta

0

010203040

Supply Voltage V

, tf vs. I

t

0.7

0.6

Pin 7

or

0.5

Pin 10

t

0.4

(µs)

f

0.3

, t

r

t

0.2

0.1

0

0

r

10

r

90%

10%

t

f

t

f

t

r

20

CC

O

V = 6 V
C = 330 pF
R = 10 k

Ta = 25

30

(V)

CC

T
T

Ω

°C

40

IO (mA)

Oscillator Frequency (kHz)

1

5 10 100

Timing Resistance (kΩ)

Undervoltage Lockout Threshold Voltage vs.

4.0

3.5

3.0

Ambient Temperature

151413121110

HA17451A

2345678

9

16

1

Vth, Vtl (V)

2.5

2.0

Undervoltage lockout threshold voltage

–200 25507585

Ambient Temperature Ta (°C)

50

C = 33000 pF

T

Vth

VtI

10

Timing Waveforms

• Internal waveform timing diagram

HA17451AP/HA17451AFP

2.05 V

1.6 V

1.45 V

1.23 V

Error amp output

100%

High

output

standstill

Low

High (off)

Low (on)

0.61 V

0.19 V

High

Low

2.5 V

CC

V min

3.3 V

0 V

Triangle oscillator

output

2.5 V

Dead time

input voltage

Reference output

of short-circuit

protection comparator

Output transistor

base waveform

(internal)

Output transistor

collector waveform

(OUT1, OUT2)

Protection enable

waveform (SCP)

Undervoltage lockout

Short-circuit

protection comparator

output (internal)

Reference

voltage (Vref )

release point

3.15 V

2.7 V

1.7 V

Supply voltage

(V )

1.5 V

CC

Undervoltage

lockout

Power-on

Notes: Voltages shown in diagram are typical values.

11

HA17451AP/HA17451AFP

Typical System Configurations

• Dual-output DC/DC converter
C3

0.47 µ

+

V = 9 V

IN

C1

0.47 µ

R2

10 k

13 k

R1

33 k

R2

33 k

C1

C2

R3

+

4.7 µ

1611521431341251161079

+

2.2 µ

C

2000 p

T

HA17451A

R

T

18 k

R10
15 k

+

C6 0.47 µ

C4

C7

470 p

470 p

R4
18 k

R5

1.8 k

HRP24 D1

8

R11
30 k

Step-down output circuit

Switching transistor
Q1

2SB857

L2

D2

HRP22

R12
33 k

R13

3.9 k

L1

36 k

12 k

R6

R7

C5

C8

V = 5 V

OUT

+

1000 µ

V = 12 V

OUT

+

100 µ

Step-up output circuit

(using transistor in IC as switching element)

V = 9 V

IN

Step-up output circuit

(using external transistor

C4

+

470 k
470 p

10 µ

R6

2.2 k

S.C.P disable

R5

C3

+

R3R433 k

R1

3.9 k

33 k

C2

1611521431341251161079

+

2.2 µ
HA17451A

8

C

2000 p

63 k

T

R
18 k

470 p

T

C6

R11

2.2 k

R10
470 k

as switching element)

L1

D1

Q1

HRP24

2SB857

Q2

Inverting output circuit

2SB857

D2

HRP24

L2

R7
R8

C7 470 µ

75 k

6.8 k

+

V = 15 V

OUT

+

C5
470 µ

V = –15 V

OUT

R9

R12

820 k

Units R:

Ω

C:L:F

H

12

Precautions

Precaution concerning inverting (negative voltage) output

Circuit diagram

V

CC

OUT

HA17451A

Vref

INV. INPUT

HA17451AP/HA17451AFP

V

IN

Negative
DC output

–

–V

OUT

+

Iref

R

Conditions
To prevent leakage current in the IC from interfering

with stable and efficient operation, choose R and R

12

values that satisfy the following condition:

|V | V

R + R >

1 2

where, R , R :

12

|V |:

OUT

18 µA:

OUT

18 µA

Feedback voltage resistors
Absolute value of negative output voltage
Minimum current with negative voltage
at reference voltage pin; I (min)

OR

R

21

Iref

I (min)

OR

18 µA

–0.2 V 0 V Vref

13

HA17451AP/HA17451AFP

Package Dimensions

19.20

20.00 Max

16 9

1.3

1.11 Max

2.54 ± 0.25

81

0.48 ± 0.10

6.30

7.40 Max

5.06 Max

2.54 Min

0.51 Min

Hitachi Code
JEDEC
EIAJ
Mass

7.62

0.25

0° – 15°

(reference value)

+ 0.13
– 0.05

DP-16
Conforms
Conforms

1.07 g

Unit: mm

10.06

10.5 Max

16

1

0.80 Max

1.27

*0.42 ± 0.08

± 0.06

0.40

*Dimension including the plating thickness

Base material dimension

9

8

0.12

5.5

0.10 ± 0.10

0.15
M

2.20 Max

7.80

0.20 ± 0.04

*0.22 ± 0.05

0.70 ± 0.20

Hitachi Code
JEDEC
EIAJ

(reference value)

Mass

+ 0.20
– 0.30

1.15

0

° – 8°

FP-16DA
—
Conforms

0.24 g

Unit: mm

14

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.

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15