L5994 STMicroelectronics, L5994 Datasheet - Page 24

• Manufacturer Part Number: L5994
• Description: IC CTRLR PS ADJ TRPL-OUT 32-TQFP
• Manufacturer: STMicroelectronics

Specifications of L5994

• Pwm Type: Current Mode
• Number Of Outputs: 3
• Frequency - Max: 345kHz
• Duty Cycle: 96%
• Voltage - Supply: 4.75 V ~ 25 V
• Buck: Yes
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 140°C
• Package / Case: 32-TQFP, 32-VQFP
• Frequency-max: 345kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L5994 - L5994A
Figure 9. Demo Board Efficiency vs Output
Figure 10. Demo Board Efficiency vs Output
Figure 11. Demo Board Efficiency vs Output
24/26
EFF.
EFF.
EFF.
(%)
(%)
(%)
90
80
70
60
50
90
80
70
60
50
90
80
70
60
50
0.001
0.001
0.001
Vin=15V
Vin=15V
Vin=15V
Current
Current
Current
0.005 0.01
0.005 0.01
0.005 0.01
Vin=6V
Vin=6V
Vin=6V
0.05 0.1
0.05 0.1
0.05 0.1
Vin=20V
Vin=20V
Vin=20V
V
f
RUN3=GND
NOSKIP=GND
V
f
RUN3=GND
NOSKIP=GND
V
f
RUN5=GND
NOSKIP=GND
SW
SW
SW
O
0.5 1
O
0.5 1
O
0.5 1
=5.1V
=5.1V
=3.3V
=200KHz
=300KHz
=200KHz
D96IN422A
D96IN420
D96IN421
5 I
5 I
5 I
O
O
O
(A)
(A)
(A)
Figure 12. Demo Board Efficiency vs Output
Figure 13. Demo Board Overall Efficiency (Iout3
Figure 14. Demo Board Overall Efficiency (Iout5 =
EFF.
EFF.
(%)
93
92
91
90
89
88
87
(%)
EFF.
93
92
91
90
89
(%)
90
80
70
60
50
0.001
0.001
0.001
Current
= 3A, REG12 = OPEN, OSC = GND)
3A, REG12 = OPEN, OSC = GND)
Vin=15V
0.005 0.01
0.005 0.01
0.005 0.01
Vin=6V
Vin=20V
Vin=6V
0.05 0.1
0.05 0.1
0.05 0.1
Vin=20V
Vin=6V
Vin=20V
V
f
RUN5=GND
NOSKIP=GND
SW
0.5 1
O
0.5 1
0.5 1
=3.3V
=300KHz
D96IN423A
D97IN581
D97IN582
5 I
5I
5 I
OUT3
OUT5
O
(A)
(A)
(A)