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DI-24 Datasheet(PDF) 1 Page - Power Integrations, Inc.

Part No. DI-24
Description  30 W DC-DC Converter
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Maker  POWERINT [Power Integrations, Inc.]
Homepage  http://www.powerint.com
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DI-24 Datasheet(HTML) 1 Page - Power Integrations, Inc.

   
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Design Idea DI-24
DPA-Switch
30 W DC-DC Converter
September 2002
DI-24
®
Application
DC-DC Converter
DPA424R
5 V
Power Output
30 W
Input Voltage
Output Voltage
Topology
Device
36-75 VDC
Forward
Design Highlights
• Extremely low component count
• High efficiency – 85% using Schottky rectifiers
• No current sense resistor or current transformer required
• Output overload, open loop and thermal protection
• Accurate input under/over voltage meets ETSI standards
• Operates to zero load
• 400 kHz operation minimizes size of magnetics
• Available for prototyping in DAK-21
Operation
DPA-Switch greatly simplifies the design compared to a discrete
implementation. Resistor R1 programs the input under/over
voltages to 33 V and 86 V, respectively, and linearly reduces the
maximum duty cycle with input voltage to prevent core saturation
during load transients. These thresholds have tolerances that
guarantee the converter is operational at 36 V, without the cost
of additional line sense components.
Figure 1. DPA-Switch 30 W DC-DC Converter.
Resistor R3 programs the internal DPA424R current limit to
85% of nominal, just above the level needed at full load,
limiting overload power. This feature also allows a larger
DPA-Switch to be selected, without requiring any other
circuit changes. A larger DPA-Switch reduces conduction
losses, raising efficiency.
Capacitors C8 and C9 provide transformer core reset; C8 also
limits the leakage inductance spike on the DRAIN. Resistor
R5 in series with C9 damps ringing. Zener diode VR1
provides a hard voltage clamp to limit DRAIN voltage, but is
only active during transients and overload conditions.
The bias supply for U1 is provided from an auxiliary winding
on output inductor L2. This gives higher efficiency than a
transformer winding, since it provides a fixed voltage
independent of input voltage. Pre-load R13 maintains the
bias voltage
≥8 V at zero load.
On the secondary, a soft finish network, C13, D3 and R7,
eliminates output turn-on overshoot. The remaining
components provide output voltage regulation and loop
compensation.
U1
DPA424R
D2
MBRB2545CT
D1
BAV19WS
C3
1 µF
100 V
1
7,8
1
7,8
5,6
4
3
C8
47 pF
200 V
C5
220 nF
VR1
SMBJ
150
C6
68 µF
10 V
C7 1 nF
1.5 kV
R14
10 Ω
U2
R5
1.0 Ω
C9
2.2 nF
50 V
R3
8.25 kΩ
1%
R1
619 kΩ
1%
R4
1.0 Ω
C10
100 µF
10 V
C11
100 µF
10 V
C12
1 µF
10 V
-VIN
+VIN
36-75 VDC
L1
1 µH 2.5 A
L2
8 µH 6 A
C4
4.7 µF
20 V
R13
160 Ω
C1
1 µF
100 V
C2
1 µF
100 V
DL
SX
F
C
CONTROL
CONTROL
PI-2993-090602
DPA-Switch
T1
RTN
5 V, 6 A
U2
D3
BAV19WS
U3
LM431AIM3
R9
220 Ω
R11
10.0 kΩ
1%
R10
10.0 kΩ
1%
R12
5.1 Ω
R7
10 kΩ
C14
1 µF
C13
10 µF
10 V
C16
100 nF
R6
150 Ω
5,6
2
®


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