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PDF HA17451 Data sheet ( Hoja de datos )
| Número de pieza | HA17451 | |
| Descripción | Switching Regulator Controllers for DC/DC Converters | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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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
1 page  
HA17451AP/HA17451AFP
Short-circuit Protection in HA17451A
← Feedback line
Also used as positive feedback route
5
12
(2)
(voltage drop)
Error Amp2
14 +
13 –
Low
+
+
–
1.23 V
Vref
High
15
PWM Comparator2
+
–
–
(3)
Vref
Low
R
U.V.L.O.
VB
10
Vout (1)
Load
Shutdown
(1)Overcurrent → (2)Vout drops → (3)Output turns off
Positive
feedback
Absolute Maximum Ratings (Ta = 25°C)
Item
Symbol
Rating
Unit Note
Power supply voltage
Error amplifier input voltage
Collector output voltage
Collector output current
Power dissipation
Operating temperature
VCC
VI
VO
IO
PT
Topr
40
20
40
50
680
− 20 to +85
V
V
V
mA
mW
°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
5 Page 
Timing Waveforms
• Internal waveform timing diagram
HA17451AP/HA17451AFP
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet HA17451.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HA17451 | Switching Regulator Controllers for DC/DC Converters | Hitachi Semiconductor |
| HA17451AFP | Switching Regulator Controllers for DC/DC Converters | Hitachi Semiconductor |
| HA17451AP | Switching Regulator Controllers for DC/DC Converters | Hitachi Semiconductor |
| HA17458 | Dual Operational Amplifier | Hitachi Semiconductor |
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