HA17524P/FP

Switching Regulator Controller

Features

• Pulse width modulation (PWM)

• Wide oscillation frequency range: 450 kHz(typ)
• Low quiescent current: 5 mA typ
• Good line regulation (0.2% typ) and load regulation (0.4% typ)
• Independent output stages for 2 channels
• Wide external circuit applications including single-end and push-pull method
• Reference power source output stage and switching output stage include current limiting protection
circuit.

Ordering Information
Type No. Package
HA17524P 16 pin dual in line plastic(DP-16)
HA17524FP 16 pin flat plastic (FP-16DA)

Pin Arrangement

INV.
Input 1 16 V REF
NON-INV. 2 15 VCC
Input
OSC Out 3 14 E2
CL(+) 4 13 C2
CL(–) 5 12 C1
RT 6 11 E1
CT 7 10 SHUT
DOWN
GND 8 9 COMP

(Top View)
HA17524P/FP

Functional Description

Principals of HA17524 Operation

The HA17524 switching regulator circuit, using pulse width modulation (PWM), is constructed as shown
in figure 1.

Timing resistances RT and timing capacitance C T control the oscillation frequency. CT is charged by a
constant current generated by RT . Ramp signals (saw-tooth waves) at the CT terminal generated by this
oscillator is available for reference input signal to comparator which control the pulse width.

VREF
16
Ref. +5 V to internal circuitry
VCC 15 Volt.
+5V 12 C1
+5 V OSC Out Q
3 Flip Flop NOR Q1
RT 6
Osc. Q
CT 11 E 1
7 +5V
(Ramp) 13 C2
—
Comparator NOR Q2
+5V
+
+5V 14 E 2
INV. Input 1 — Error Amp. + 4 CL(+)
C.L.
NON-INV. Input 2 + — 5 CL(—)
1kΩ 9 COMP
GND 8 10 Current Limiter
SHUT 10kΩ
DOWN

Figure 1 HA17524 Block Diagram

The reference voltage connects to the non-inverted or inverted input terminal of the error amplifier via
resistance divider (figure 2).

The output voltage from the error amplifier is compared with the ramp signal capacitance CT (figure 1).
The comparator can provide a signal with modulated pulse width.

This signal, then, controls output transistors Q1 and Q 2, making an open loop to stabilize output voltage.

Outputs form the error amplifier the current limiter, and the shut-down circuit are connected together at the
comparator, so that an input signal from any one of these circuits can break the output stage.

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 HA17524P/FP

VREF To Positive Regulated VREF

Output Voltage VO
5kΩ R2 5kΩ R1
+ +
5kΩ − −
R1 Error Amp 5kΩ R 2 Error Amp
To Negative Regulated
Output Voltage VO
(a) Forward Output Stabilizing Source (b) Reverse Output Stabilizing Source
R + R2 R + R2
VO = 2.5 1 (V) VO = 5 − 2.5 1 (V)
R1 R1

Figure 2 Error Amplifier Biasing

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HA17524P/FP

Blocks Description

Oscillator: The oscillation frequency f is calculated from the following equations. Figure 3 shows one
example.

f 1.15/(RT •CT)

R T = 1.8k to 100 k Ω

C T = 0.001µ to 0.1 µF

f = 140 Hz to 500 kHz

1M
VCC = 20 V
400 k Ta = 25°C
C
T =
Oscillating Frequency f (Hz)

100 k 0.
00
1
µF
40 k
C
T =
10 k 0.
01
µF
4k
C
T =
1k 0.
1
µF
400

100
1k 4k 10 k 40 k 100 k
Timing Resistance RT ( Ω)

Figure 3 Oscillating Frequency vs Timing Resistance

Then the ramp wave shown in figure 4 is available at pin 7, C T terminal, since C T is charged by the constant
current I generated by RT.

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 HA17524P/FP

VREF VH
Q1 Q2 ∆V
VL
T

Q3 CT Terminal Waveform
Discharge VREF – VEB (Q2) – VEB (Q3)
I≈
6 7 RT
I I ∆V = VH – VL ≅ 3.8 – 0.9 = 2.9 V
RT CT
1
T ≈ CT · ∆V ·
I

Figure 4 Oscillating Circuit and CT Terminal Waveform

The oscillator output pulse signal is used as the flip flop clock pulse and as switching pulses for the output
transistors, synchronous to the clock pulse.

The pulse-widths which can be controlled by the timing capacitor C T as shown in figure 5, increases output
dead time.

10
VCC = 20 V
RT = 10 k Ω
Ta = 25°C
3
Dead Time (µs)

1.0

0.3

0.1
0.001 0.003 0.01 0.03 0.1
Timing Capacitance CT (µF)

Figure 5 Dead Time vs Timing Capacitance

Reference Voltage: The built-in regulator (reference voltage: VREF = 5 ±0.4 V) can be used as a reference
power supply for the error amplifier, which determines output voltage (V OUT). It is also connected as a bias
source for another circuits in IC.

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HA17524P/FP
Error Amplifier: Figure 2 shows error amplifier biasing, applied input voltage must be set within the range
of common-mode input voltage (1.8 V to 3.4 V). Inserting a resistor and capacitor between phase
compensation terminal (pin 9) and GND in series provides phase compensation.

Current Limiter: The sense amplifier threshold voltage (VS) for the current limiter is:

VS = VBE (Q ) + I1R2 – VBE (Q2)

= I1R2

= 200 mV typ

At the current limiter sense amp shown in figure 6, when V+ – V– 200 mV, Q1 turns on, phase
compensation terminal becomes low and the output switching element is cut off.

Comp CT

Error Comparator
Amp
R1 R2
Q1
I1 Q2

(–)C.L. (+)C.L.
Sense Amp
V– V+

Figure 6 Current Limiter Sense Amplifier

Figure 7 shows an example of detecting current limit. The input voltage range is –0.7 V to +1.0 V; The
current limit detection output is provided from GND line.

E1
+VOUT
E2
HA17524
CL(–) RS
CL(+)

VS
IOS =
RS
VS = 200 mV

Figure 7 Current Limit Detector Example Operating Waveforms

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 HA17524P/FP

Operating Waveforms

Figure 9 shows operating waveforms at every part, when stepdown voltage type chopper switching
regulator (figure 8) is used. Operating condition are as follows: f = 20 kHz, VOUT = 5 V. At the output
section, two channels are connected in parallel. Operating waveforms inside the IC are also shown.

HA17524
(A)
VCC 15 V Q L
VOUT
5 kΩ
5V
5 kΩ (15) VCC
(1) Inv E1(11)
5 kΩ
(2) Non Inv C 1(12) D C
0.1 µF 5 k Ω
(16)Ref C 2(13)
6 kΩ 3 kΩ
(6) R T E2 (14)
0.01 µF
(7) C T +CL (4)
(10)Shut –CL (5)
Down
(3) Comp (9)
Osc Out (8) GND 0.001 µF
RS
50 k Ω

Figure 8 Stepdown Voltage Type Chopper Switching Regulator

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HA17524P/FP

CT Terminal

Output Voltage of Error Amp

OSC OUT

Dead Time

Comparator Out

Q(F/F)

Q(F/F)

C1 (Q1 )
On

C2 (Q2 )
On

A (Q)
On On
50 µs 50 µs

Figure 9 Operating Waveforms

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 HA17524P/FP

Circuit Applications

Simplified inverting Regulator: Figure 10 shows the circuit configuration of HA17524 inverting regulator
for light load (VOUT = –5 V)

VCC = 15 V

15 k Ω
5 kΩ VCC
–5 V
INV Input E1
5 kΩ 5 kΩ 20 mA
NON INV Input C 1 VOUT
0.1 µF
VREF C2
2 kΩ 20 µF
RT E2
CT CL(+)
0.01 µF
SHUT DOWN CL(–)
–
Osc Out COMP 50 µF
+
GND

Figure 10 Simple Polarity Conversion

Tracking Switching Regulator: Figure 11 shows the circuit configuration of a tracking regulator that uses a
transformer. (VOUT = ±15 V)

VCC = 5V
+
+15V
50T 50µF −
+ 300Ω 200Ω 20T 20mA
100µF − 25kΩ
+
VCC 50T 50µF −
5kΩ –15V
INV. E1
Input 1MΩ
5kΩ
NON-INV. C1
Input 0.1µF
5kΩ
VREF C2
2kΩ
RT E2
0.02µF
CT CL(+)
SHUT 620Ω
CL(–)
DOWN
OSC Out COMP 510Ω
+
GND
0.001µF −4.7µF 1Ω

Figure 11 Tracking Switching Regulator

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HA17524P/FP
Push Pull Switching Regulator: Figure 12 shows the circuit configuration of push-pull switching regulator
that uses transformer. This system is suited for high power. Output transistors inside HA17524 can drive
external switching transistors.

VCC = 28V

5kΩ 1kΩ 1kΩ

1W 1W
VCC
5kΩ
INV. E1 1mH
Input
5kΩ +
NON-INV. 1kΩ 1,500µF
Input
C1 20T 5T − 5V, 5A
0.1µF 5kΩ
VREF C2 20T 5T
1kΩ
2kΩ
RT E2
0.01µF
CT CL(+)
0.1Ω
SHUT CL(–)
DOWN +
− 100µF
OSC Out COMP
0.001µF
GND
20kΩ

Figure 12 Push-Pull Switching Regulator

Note

Compared with conventional series regulators, switching regulators generate high frequency noise by
switching current quickly. To reduce noise

1. As a general rule, insert line filter to reduce noise at the input.

2. To reduce noise at the output:
a. Twist output wiring together.
b. Do not bundle power source and output wiring.
c. Insert capacitor should be inserted at the load side.
d. Ground the power frame.

3. When choosing external parts (external switching transistor, diode, coil, etc) consider their capacitance
and characteristics.

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 HA17524P/FP

Absolute Maximum Ratings (Unless otherwise specified, Ta = +25°C)

Item Symbol Rating Unit Note
Supply voltage VCC 40 V 1, 2
Collector output current IC 100 mA
Reference output current I REF 50 mA
Current through CT terminal I CT 5 mA
Continuous total power dissipation PT 600 mW 3
Operating free-air temperature range Topr –20 to +75 °C
Storage temperature range Tstg –55 to +125 °C
Notes: 1. With respect to network ground terminal
2. The reference voltage can be given by connecting the V CC and 5 V reference output pins both to
the supply voltage. In this configuration, VCC = 6 V max.
3. HA17524P: Value at Ta ≤ 52.7°C, If Ta > 52.7°C, derate by 8.3 mV/°C

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HA17524P/FP

Electrical Characteristics (VCC = 20 V, f = 20 kHz, Ta = 25°C)

Item Symbol Min Typ Max Unit Test Conditions
Regulator Output voltage VREF 4.6 5.0 5.4 V
Input regulation δVOLine — 10 30 mV VCC = 8 to 40 V
Ripple rejection RREJ — 66 — dB f = 120 Hz
Output regulation δVOLoad — 20 50 mV Iout = 0 to 20 mA
Output voltage δVO /δTa — 0.3 1.0 % Ta = 0 to +70°C
change with — 0.4 1.36 % Ta = –20 to +75°C
output temperature

Short-circuit output I OS — 100 — mA VREF = 0

current (Note)
Error Input offset voltage VIO — 2 10 mV VIC = 2.5 V
amplifier Input bias current II — 2 10 µA VIC = 2.5 V
Open-loop voltage AVD — 60 — dB
gain
Common-mode VCM 1.8 to 3.4 — — V Ta = 25°C
input voltage range
Common-mode CMR — 70 — dB
Rejection ratio
Unity-gain BW — 3 — MHz
bandwidth
Output swing VOPP 0.5 — 3.8 V
Oscillator OSC frequency f — 450 — kHz CT = 0.001 µF,
RT = 2 kΩ
Standard deviation ∆ f — 5 — % VCC = 8 to 40 V,
of frequency RT = 1.8 to 100 kΩ,
C = Const
Frequency stability δfLine — — 1.0 % VCC = 8 to 40 V
δf/δTa — 5.0 10 % Ta = 0 to +70°C
— 5.0 13.6 % Ta = –20 to +75°C
Output amplitude V3(peak) — 3.5 — V Pin 3
Output pulse width TP — 0.5 — µs CT = 0.01 µF, Pin 3
Comparator Maximum duty Dmax 45 — — %
cycle
Threshold voltage Vth 0 — 1.0 — V Duty cycle = 0
Vth max — 3.5 — V Duty cycle = max
Input bias current II — –1 — µA
Note: Duration of the short-circuit should not exceed one second.

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 HA17524P/FP

Electrical Characteristics (VCC = 20 V, f = 20 kHz, Ta = 25°C) (cont)

Item Symbol Min Typ Max Unit Test Conditions
Current Input voltage range VIS –0.7 to +1.0 — — V
limiter Sense voltage VS 180 200 220 mV V(Pin 9) = 2 V,
Ta = 25°C
V(Pin 2)
– V(Pin 1) ≥ 50 mV
Sensevoltage δVS/δTa — 0.2 — mV/°C Ta = –20 to +75°C
change with
temperature
Output Collector-emitter VCE 40 — — V
breakdown voltage
Collector off-state I Leak — 0.01 50 µA VCE = 40 V
current
Collector-emitter VCE(sat) — 1 2 V I C = 50 mA
saturation voltage
Emitter output VE 17 18 — V VCC = 20 V,
voltage I E = –250 µA
Rise time tr — 0.2 — µs RC = 2 kΩ
Fall time tf — 0.1 — µs
Total Standby current I ST — 5.0 10 mA VCC = 40 V, V2 = 2 V,
device Pins 1, 4, 7, 8, 9, 11,
14grounded,
All other pins open

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HA17524P/FP

Characteristic Curves

Output Voltage vs. Supply Voltage

6.0

Output Voltage VREF (V)

5.0
Ta = 25°C
4.0 IO = 0

3.0

2.0

1.0

0
10 20 30 40
Supply Voltage VCC (V)

Output Saturation Voltage vs. Output Collector Current

1.0
Output Saturation Voltage VCE(sat) (V)

0.5

0
0 10 20 30 40 50
Output Collector Current IC (mA)

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 HA17524P/FP

Oscillating Frequency vs. Timing Resistance

500 k
VCC = 20 V
Ta = 25°C
C
100 k

Oscillating Frequency f (Hz)

T =
0.0
50 k 01
µF
20 k
C
T =
10 k 0.0
1µ
5k F

2k C
T =
1k 0.1
µF
500

200
100
1 2 5 10 20 50 100
Timing Resistance RT (kΩ)

Output Voltage vs. Ambient Temperature

5.1
VCC = 20 V
I O = 0 mA
Output Voltage VREF (V)

5.0

4.9

4.8
–20 0 20 40 60 75
Ambient Temperature (°C)

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HA17524P/FP

Dead Time vs. Timing Capacitance

10
VCC = 20 V
RT = 10 k Ω
Ta = 25°C
3

Dead Time (µs)

1.0

0.3

0.1
0.001 0.003 0.01 0.03 0.1
Timing Capacitance CT (µF)

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 HA17524P/FP

Package Dimensions

Unit: mm
19.20
20.00 Max
16 9

7.40 Max
6.30
1 8
1.3

1.11 Max
7.62

2.54 Min 5.06 Max

0.51 Min

+ 0.13
2.54 ± 0.25 0.48 ± 0.10 0.25 – 0.05

0° – 15°
Hitachi Code DP-16
JEDEC Conforms
EIAJ Conforms
Mass (reference value) 1.07 g

Unit: mm

10.06
10.5 Max
16 9
5.5

1 8
*0.22 ± 0.05
0.20 ± 0.04

7.80 +– 0.30
0.20
2.20 Max

0.80 Max 1.15

0° – 8°
0.10 ± 0.10

1.27 0.70 ± 0.20

*0.42 ± 0.08
0.40 ± 0.06
0.15

0.12 M
Hitachi Code FP-16DA
JEDEC —
*Dimension including the plating thickness EIAJ Conforms
Base material dimension Mass (reference value) 0.24 g

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HA17524P/FP

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 fail-
safes, 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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Copyright ' Hitachi, Ltd., 1998. All rights reserved. Printed in Japan.

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