0

6

20

40

60

250

200

150

100

50

Load Curent = 500 mA

200

400

600

800

1000

LOAD CURRENT (mA)

80

60

40

20

0

100

12V

60V

LM5010A

LM5010A-Q1

www.ti.com

SNVS376E – OCTOBER 2005 – REVISED FEBRUARY 2013

Table 2. Bill of Materials

Item

Description

Value

C1

Ceramic Capacitor

(2) 2.2 µF, 100V

C2

Ceramic Capacitor

22 µF, 16V

C3

Ceramic Capacitor

0.47 µF, 16V

C4, C6

Ceramic Capacitor

0.022 µF, 16V

C5

Ceramic Capacitor

0.1 µF, 100V

D1

Schottky Diode

100V, 6A

L1

Inductor

100 µH

R1

Resistor

1.0 k

Ω

R2

Resistor

1.0 k

Ω

R3

Resistor

1.5

Ω

Resistor

200 k

Ω

U1

LM5010A

Circuit of Figure 12

Circuit of Figure 12

MINIMUM LOAD CURRENT

The LM5010A requires a minimum load current of 500 µA. If the load current falls below that level, the bootstrap

capacitor (C4) may discharge during the long off-time, and the circuit will either shutdown, or cycle on and off at

a low frequency. If the load current is expected to drop below 500 µA in the application, R1 and R2 should be

LOW OUTPUT RIPPLE CONFIGURATIONS

For applications where low output voltage ripple is required the output can be taken directly from the low ESR

output capacitor (C2) as shown in Figure 15. However, R3 slightly degrades the load regulation. The specific

component values, and the application determine if this is suitable.

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