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PDF HA17524P Data sheet ( Hoja de datos )
| Número de pieza | HA17524P | |
| Descripción | Switching Regulator Controller | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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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
(Top View)
1 page  
HA17524P/FP
Q1
6
I
RT
VREF
Q2
Q3
Discharge
7
I CT
VH
∆V
T VL
CT Terminal Waveform
I ≈ VREF – VEB (Q2) – VEB (Q3)
RT
∆V = VH – VL ≅ 3.8 – 0.9 = 2.9 V
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 CT as shown in figure 5, increases output
dead time.
10
VCC = 20 V
RT = 10 kΩ
Ta = 25°C
3
1.0
0.3
0.1
0.001
0.003
0.01
0.03
Timing Capacitance CT (µF)
0.1
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 (VOUT). It is also connected as a bias
source for another circuits in IC.
5
5 Page 
HA17524P/FP
Absolute Maximum Ratings (Unless otherwise specified, Ta = +25°C)
Item
Symbol
Rating
Unit
Note
Supply voltage
Collector output current
Reference output current
Current through CT terminal
Continuous total power dissipation
Operating free-air temperature range
VCC
IC
I REF
I CT
PT
Topr
40
100
50
5
600
–20 to +75
V
mA
mA
mA
mW
°C
1, 2
3
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 VCC 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
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet HA17524P.PDF ] | |
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