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NCP5355
APPLICATIONS INFORMATION
CBST w
Enable Pin
The Enable pin allows logic level On/Off control of the
NCP5355. A Logic Level Low (< 0.8 V) disables the part by
forcing both TG and BG low. Bringing both gates low prevents
the output voltage from ringing below ground at turn?off. A
Logic Level High (> 2.0 V) enables the part by allowing CO to
control TG and BG.
If the Enable function is not being used, the Enable pin should
be left unconnected. This will Enable the part by default, as the
Enable pin will be internally pulled high by a 2.0 m A current.
The maximum high voltage level is 5.0 V. Voltages greater than
this may damage the part.
Supply Capacitor Selection
A 1.0 m F ceramic capacitor (C VS in Figure 4) should be
located close to the V s supply pins to provide peak current and
to reduce noise. A small 1.0 W to 5.0 W resistor (R VS in
Figure 4) may also be added in series with C VS to provide
additional filtering in noisy environments.
Bootstrap Capacitor Selection
The size of the Top MOSFET bootstrap capacitor (C BST in
Figure 4 ) is determined from the following equation:
QTtopFETs
D VBST
where
Undervoltage Lockout
Gates TG and BG are both held low until V s reaches the
UVLO Start Threshold of 8.0 V during startup. V s exceeding the
Q TtopFETs
D V BST
is the sum of the Top MOSFETs total gate
charge,
is the maximum change in voltage across
UVLO threshold allows CO to take control of both gates. If V s
falls below the UVLO Stop Threshold of 7.0 V, both gates are
then forced low until V s again exceeds the Start Threshold.
the bootstrap capacitor and is typically
designed for a drop of less than a 1.0 V.
For example, a circuit using one Top MOSFET with a typical
Q TtopFETs of 60 nC (at 12 V Vgs) and 1.0 V of droop would give
a minimum value for C BST of 60 nF.
V IN = 12 V
D BST
(Optional)
C BST
1.0 m
C O
C VS
1.0 m
R VS
2.2
4
5
6
CO BST
EN TG
V S DRN
PGND
U1 BG
NCP5355
3
2
1
8
7
R GU
2.2
Q top
NTD60N03
Q bottom1
NTD80N02
Q bottom2
NTD80N02
Switch Node
C SN
4700 p
C IN
4.7 m
R SN
2.2
L OUT
V CORE = 1.40 V
+
C OUT
Figure 4. Typical NCP5355 Application
86
85
84
83
82
Internal Diode
External Diode
81
80
79
78
77
Internal Diode
Internal Diode
External Diode
External Diode
200 kHz, Series 2
400 kHz, Series 4
600 kHz, Series 8
76
75
74
73
10
15
20
25
I O (A)
Figure 5. Efficiency With and Without an Added External Bootstrap Diode, See Figure 4 for Test Circuit
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