HIT HA17451AP, HA17451AFP Datasheet
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
HA17451AP/HA17451AFP
Features
• Low dropout voltage of on-chip 2.5V voltage reference: Vdrop = 0.2 V (typ)
• Operates throughout wide supply voltagerange: 3.3 V to 40 V
• Large maximum output current: 50 mA (max)
• Undervoltage lockout circuit
High threshold voltage: 3.15 V (typ)
Low threshold voltage: 2.98 V (typ)
• Low current drain: 1.5 mA (typ)
• Operates at wide range of oscillator frequencies: f
• Dead time adjustable through full duty cycle range
• Surface-mount package (SOP16) for saving space (HA17451AFP)
Ordering Information
Type Name Package
HA17451AP DP-16
HA17451AFP FP-16DA
= 1 kHz to 300 kHz
OSC
2
Pin Arrangement
HA17451AP/HA17451AFP
C
R
NON. INV.
INPUT1
INV.
INPUT1
FEED
BACK1
D.T.C1
OUT1
GND
1
T
2
T
3
4
5
6
7
16
15
14
13
12
11
10
8
9
Vref
S.C.P
NON. INV.
INPUT2
INV.
INPUT2
FEED
BACK2
D.T.C2
OUT2
V
CC
(Top view)
Pin Functions
Pin No. Symbols Functions
1C
2R
T
T
3, 14 NON. INV. INPUT Non-inverting input of error amp
4, 13 INV. INPUT Inverting input of error amp
5, 12 FEEDBACK Output of error amp
6, 11 D.T.C Dead time control
7, 10 OUT Output
8 GND Ground
9VCCInput voltage
15 S.C.P Short circuit protection
16 Vref Reference voltage output
Timing capacitor
Timing resistor
3
HA17451AP/HA17451AFP
Block Diagram
R
(2)
TT
C
(1)
PWM
comparator1
Triangle
oscillator
OUT1
(7)
+––
Output1
OUT2
(10)
+––
PWM
comparator2
Output2
Vref
R
Under-
voltage
lockout
(11) (8)
(6)
GND
TIME
DEAD
D.T.C2D.T.C1
TIME
DEAD
CONTROL2
CONTROL1
CC
V
(9)
voltage
Reference
generation
Error amp1
(16)
Vref
4
Short circuit
protection
comparator
circuit
+
(3)
NON. INV. INPUT1
+–+
–
(5)
(4)
INV. INPUT1
FEEDBACK1
Vref /2
+
Error amp2
(12)
(14)
FEEDBACK2
NON. INV. INPUT2
–
(15)
(13)
S.C.P
INV. INPUT2
Short-circuit Protection in HA17451A
←
Feedback line
Also used as positive feedback route
HA17451AP/HA17451AFP
V
B
(2)
(voltage drop)
5
12
Error Amp2
+
14
–
13
Low
High
15
(1)Overcurrent → (2)Vout drops → (3)Output turns off
1.23 V
Vref
+
+
–
Shutdown
Positive
feedback
Absolute Maximum Ratings (Ta = 25°C)
PWM Comparator2
+
–
–
Vref
R
U.V.L.O.
(3)
Low
10
Vout
(1)
Load
Item Symbol Rating Unit Note
Power supply voltage V
Error amplifier input voltage V
Collector output voltage V
Collector output current I
Power dissipation P
CC
I
O
O
T
40 V
20 V
40 V
50 mA
680 mW *
Operating temperature Topr − 20 to +85 °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
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