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PDF HA17384HRP Data sheet ( Hoja de datos )
| Número de pieza | HA17384HRP | |
| Descripción | High Speed Current Mode PWM Control IC for Switching Power Supply | |
| Fabricantes | Hitachi Semiconductor | |
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HA17384SPS/SRP, HA17384HPS/HRP,
HA17385HPS/HRP
High Speed Current Mode PWM Control IC
for Switching Power Supply
ADE-204-028A (Z)
2nd Edition
Nov. 1999
Description
The HA17384S/H and HA17385H are PWM control switching regulator IC series suitable for highspeed,
current-mode switching power supplies. With ICs from this series and a few external parts, a small, low
cost flyback-transformer switching power supply can be constructed, which facilitates good line regulation
by current mode control. Synchronous operation driven after an external signal can also be easily obtained
which offers various applications such as a power supply for monitors small multi-output power supply.
The IC series are composed of circuits required for a switching regulator IC. That is a under-voltage
lockout (UVL), a high precision reference voltage regulator (5.0 V ± 2%), a triangular wave oscillator for
timing generation, a high-gain error amplifier, and as totem pole output driver circuit which directly drives
the gate of power MOSFETs found in main switching devices. In addition, a pulse-by-pulse type, high-
speed, current-detection comparator circuit with variable detection level is incorporated which is required
for current mode control.
The HA17384SPS includes the above basic function circuits. In addition to these basic functions, the H
Series incorporates thermal shut-down protection (TSD) and overvoltage protection (OVP) functions, for
configuration of switching power supplies that meet the demand for high safety levels.
Between the HA17384 and HA17385, only the UVL threshold voltages differ as shown in the product
lineup table.(See next page.)
This IC is pin compatible with the “3842 family” ICs made by other companies in the electronics industry.
However, due to the characteristics of linear ICs, it is not possible to achieve ICs that offer full
compatibility in every detail.
Therefore, when using one of these ICs to replace another manufacturer’s IC, it must be recognized that it
has different electrical characteristics, and it is necessary to confirm that there is no problem with the power
supply (mounting) set used.
1 page  
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Absolute Maximum Ratings
Item
Symbol
Rating
Unit Note
Supply voltage
DC output current
Peak output current
Error amplifier input voltage
COMP terminal input voltage
Error output sink current
Power dissipation
Operating temperature
VIN
IO
IO PEAK
VFB
VCOMP
I OEA
PT
Topr
30
±0.1
±1.0
–0.3 to VIN
–0.3 to +7.5
10
680
–20 to +105
V
A
A
V
V
mA
mW
°C
1, 2
Junction temperature
Tj
125 °C 3
150 °C 4
Storage temperature
Tstg
–55 to +125
°C
3
–55 to +150
°C
4
Notes: 1. For the HA17384HPS and HA17385HPS,
This value applies up to Ta = 43°C; at temperatures above this, 8.3 mW/°C derating should be
applied.
For the HA17384SPS,
This value applies up to Ta = 68°C; at temperatures above this, 8.3 mW/°C derating should be
applied.
800
680mW
600
400 374mW
HA17384SPS
HA17384HPS, HA17385HPS
200 166mW
0
−20 0
43°C
68°C
105°C 125°C
150°C
20 40 60 80 100 120 140 160
Ambient Temperature Ta (°C)
5
5 Page 
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Timing Chart
Signal Name
Input voltage
VIN Pin 7
UVL1
Internal signal which
cannot be externally
monitored.
Reference voltage
Vref Pin 8
Waveform timing (Outline)
Power ON
2V
0V
IC turn ON
OVP input
Power OFF
Stationary operation
OVP latched
condition
16 V
(8.4 V)
This voltage is determined
by the transformer
10 V
(7.6 V)
Reset of
OVP latch
7.0 V
2V
( ) shows the case
using HA17385H
0V
5V
0V 4.7 V
4.7 V
UVL2
Internal signal which
cannot be externally
monitored.
0V
2.8 V
Oscillation voltage of
triangular wave
RT/CT Pin 4
Start up signal
Internal signal which
cannot be externally
monitored.
0V
IC operates and
PWM output stops.
0V
PWM latch setting signal
internal signal which
cannot be externally
monitored.
0V
Error amplifier input signal 0V
VFB Pin 2
1.2 V
Start up latch
release
VCOMP
7.0 V typ
(OVP input)
Error amplifier output signal
VCOMP Pin 1
0V
ID *1
OVP latch signal
Internal signal which
cannot be externally
monitored.
0V
PWM output voltage
VOUT Pin 6
0V
VIN
ID
Note: 1. ID indicates the power MOSFET drain current; it is actually observed as voltage VS generated
by power MOSFET current detection source resistance RS.
VCOMP indicates the error amp output voltage waveform. Current mode operation is
performed so that a voltage 1/3 that of VCOMP is the current limiter level.
11
11 Page | ||
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| PDF Descargar | [ Datasheet HA17384HRP.PDF ] | |
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