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HA17524 PDF даташит

Спецификация HA17524 изготовлена ​​​​«Hitachi Semiconductor» и имеет функцию, называемую «Switching Regulator Controller».

Детали детали

Номер произв HA17524
Описание Switching Regulator Controller
Производители Hitachi Semiconductor
логотип Hitachi Semiconductor логотип 

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HA17524 Даташит, Описание, Даташиты
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.
HA17524P
HA17524FP
Package
16 pin dual in line plastic(DP-16)
16 pin flat plastic (FP-16DA)
Pin Arrangement
INV.
Input
NON-INV.
Input
OSC Out
CL(+)
CL(–)
RT
CT
GND
1
2
3
4
5
6
7
8
16 VREF
15 VCC
14 E2
13 C2
12 C1
11 E1
10
SHUT
DOWN
9 COMP
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HA17524 Даташит, Описание, Даташиты
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 CT 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
VCC 15
RT 6
CT 7
(Ramp)
Ref.
Volt.
+5 V
Osc.
+5V
16
+5 V to internal circuitry
OSC Out
3
+5V
Q
Flip Flop
Q
+5V
Comparator
+
+5V
NOR
NOR
INV. Input 1
NON-INV. Input 2
GND 8
Error Amp.
+
1k
10
9 COMP
+
C.L.
4 CL(+)
5 CL(—)
Current Limiter
SHUT 10k
DOWN
12 C1
Q1
11 E1
13 C2
Q2
14 E2
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 Q2, 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.
2









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HA17524 Даташит, Описание, Даташиты
HA17524P/FP
VREF
5k
5k
To Positive Regulated
Output
R2
Voltage
VO
+
R1
Error Amp
(a) Forward Output Stabilizing Source
VO = 2.5
R1 + R2 (V)
R1
VREF
5kR1
+
5k
R2
Error Amp
To Negative Regulated
Output Voltage VO
(b) Reverse Output Stabilizing Source
VO = 5 2.5
R1 + R2
R1
(V)
Figure 2 Error Amplifier Biasing
3










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