SI-8008HFE Allegro Microsystems Inc, SI-8008HFE Datasheet - Page 3

• Manufacturer Part Number: SI-8008HFE
• Description: IC, BUCK, REG, 5.5A, 5TO220
• Manufacturer: Allegro Microsystems Inc

Specifications of SI-8008HFE

• Primary Input Voltage: 40V
• No. Of Outputs: 1
• Output Voltage: 24V
• Output Current: 5.5A
• Voltage Regulator Case Style: No. Of Pins
• Operating Temperature Range: -30°C To +85°C
• Base: RoHS Compliant
• Package / Case: TO220

SI-8008HFE
ELECTRICAL CHARACTERISTICS
Reference Voltage
Reference Voltage Temperature Coefficient
Efficiency
Operating Frequency
Line Regulation
Load Regulation
Overcurrent Protection Threshold Current
SS Terminal On/Off Operation Threshold Voltage
SS Terminal On/Off Operation Outflow Current
Quiescent Current 1
Quiescent Current 2
1
2
Using circuit shown in Typical Application Circuit diagram.
Efficiency is calculated as: η(%) = ([V
Pin-out Diagram
2
1 2 3 4 5
Figure 2. Alternative configurations for SS pin. If neither soft start nor V
Characteristic
System
TTL
Terminal List Table
control only
O
SI-8008HFE
V
Name
× I
GND
ADJ
SW
O
SS
IN
O
5
on/off
(a)
SS
] × [V
1
, valid at T
Number
IN
× I
1
2
3
4
5
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
IN
]) × 100.
A
Supply voltage
Regulated supply output
Ground terminal
Terminal for resistor bridge feedback
The SS terminal is used to enable soft start and to control on/off operation of the IC output,
V
To enable soft start, connect a capacitor between SS and ground. To control on/off
operation, connect an NPN bipolar transistor, in a TTL open collector output configuration,
between the SS terminal and GND. Turn off is done by decreasing V
level.
When both soft start and V
is required because, if the capacitance of C3 large, the discharge current of C3 flows
across the transistor for on/off operation. Because a pull-up type resistor is provided inside
the IC, no external voltage can be applied.
∆V
Symbol
O
= 25°C, V
V
V
V
V
I
ADJ
I
q(off)
SSL
(see figure 2). If neither soft start nor on/off control is used, leave pin open.
f
Load
I
ADJ
Line
SSL
I
η
O
S
q
/∆T
SI-8008HFE
Soft start
only
5
(b)
SS
V
V
V
V
V
V
V
V
V
V
IN
IN
IN
IN
IN
IN
IN
SSL
IN
IN
O
= 15 V, I
= 15 V, I
= 15 V, I
= 15 V, I
= 10 to 30 V, I
= 15 V, I
= 15 V
= 15 V, I
= 15 V, V
C3
= 5 V (adjusted), R1 = 4.2 kΩ, R1 = 0.8 kΩ
= 0 V
DC-to-DC Step-Down Converter
O
O
O
O
O
O
SS
Test Conditions
= 1 A
= 1 A, T
= 3 A
= 3 A
= 0.2 to 5.5 A
= 0 A
= 0 V
O
O
on/off are used, a protection measure such as current limiting
System
TTL
O
= 3 A
on/off is required, the SS pin is left open.
C
= 0 to 100 °C
Function
soft start control
V
SI-8008HFE
O
on/off and
5
(c)
SS
0.784
Min.
5.6
C3
–
–
–
–
–
–
–
–
–
0.800
Typ.
±0.1
150
200
6.5
83
60
20
10
–
6
SSL
below its rated
0.816
Max.
400
7.5
0.5
80
50
30
–
–
–
–
mV/°C
Units
kHz
mV
mV
mA
μA
μA
%
V
A
V
3