L296 STMicroelectronics, L296 Datasheet - Page 15

• Manufacturer Part Number: L296
• Description: IC REG SW HIGH CURR MULTIWATT15
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L296

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5.1 ~ 40 V
• Current - Output: 4A
• Frequency - Switching: 100kHz ~ 200kHz
• Voltage - Input: 9 ~ 46 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Through Hole
• Package / Case: Multiwatt-15 (Vertical, Bent and Staggered Leads)
• Power - Output: 20W
• Output Voltage: 40 V
• Output Current: 4 A
• Input Voltage: 9 V to 46 V
• Switching Frequency: 200 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: Through Hole
• Duty Cycle (max): 100 %
• Primary Input Voltage: 40V
• No. Of Outputs: 1
• No. Of Pins: 15
• Frequency: 200GHz
• Ic Generic Number: 296
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2939-5

SELECTION OF COMPONENT VALUES (see fig. 34)
Figure 35 : P.C. Board and Component Layout of the Circuit of fig. 34 (1:1 scale)
Component
C7, C8
R
Q1
R1
R2
R3
R4
R5
R6
R7
R8
C1
C2
C3
C4
C5
C6
D1
L1
iim
Recommended
100 k
100 F
300 H
390 pF
4.3 k
4.7 k
2.2 F
2.2 nF
2.2 F
Value
10 k
15 k
10 F
33 nF
–
–
–
Set Input Voltage
Threshold for Reset.
Sets Switching Frequency
Pull-down Resistor
Frequency Compensation
Collector Load For Reset
Output
Divider to Set Output
Voltage
Sets Current Limit Level
Stability
Sets Reset Delay
Sets Switching Frequency
Soft Start
Frequency Compensation
High Frequency
Compensation
Output Filter
Crowbar Protection
Recirculation Diode
Purpose
100 H
Allowed Rage
0.05A
7.5k
2.2 F
10k
Min.
1 k
1 nF
1 F
V
–
–
–
–
–
–
O
220k
100k
3.3nF
22k
Max.
1k
–
–
–
–
–
R1/R2
If output voltage is sensed R1 and
R2 may be limited and pin 12
connected to pin 10.
May be omitted and pin 6 grounded
if inhibit not used.
Omitted if reset function not used.
R7/R8 =
If R
the current limit is internally fixed.
Omitted if reset function not used.
Also determines average short
circuit current.
Not required for 5 V operation.
The SCR must be able to withstand
the peak discharge current of the
output capacitor and the short
circuit current of the device.
7A Schottky or 35 ns t
iim
is omitted and pin 4 left open
V
V
i min
5
O
V
REF
V
Notes
1
REF
L296 - L296P
-
rr
Diode.
15/22