
+INPUT
(5)
COMMON
(1)
2-PHASE
PWM
CONTROLLER
CURRENT
SENSE
REFERENCE &
ERROR AMP
VCC
ON/OFF
CONTROL
(4)
VOUT
TRIM
(2)
+OUTPUT
(7,9)
+SENSE
(10)
COMMON
(6, 8)
Figure 1. Simplified Schematic
Only one phase of two shown.
Typical topology is shown
Typical Unit
The HEN D12 Series of non-isolated eighth bricks with high di/dt are ideal
building blocks for emerging, on-board power-distribution schemes in which isolated
12V buses deliver power to any number of non-isolated, step-down buck regulators.
HEN D12 DC/DC's accept a 12V input (10.2V to 13.8V input range) and convert it,
with the highest efficiency in the smallest space, to a 0.8, 1, 1.2, 1.5, 1.8, 2, 2.5, 3.3 or 5 Volt
output fully rated at 25 Amps.
HEN D12's are ideal POLPP's (point-of-use/load power processors) and they typically require
no external components. They occupy the standard eighth-brick board space (0.9" x 2.3") and
come in either through-hole packages or surface-mount packages with a profile of only 0.39
inches (0.5" including optional heat sink).
The HEN's best-in-class power density is achieved with a fully synchronous,
fixed-frequency, 2-phase buck topology that delivers extremely high efficiency (92.5%
for 5VOUT models), low noise (10mVp-p typ.), extremely tight line/load regulation
(±0.05%/0.1%max.), fast transient response (50A/sec with full-load step), stable
no-load operation, and no output reverse conduction.
The fully functional HEN's feature input over/undervoltage lockout, output overvoltage and
overcurrent detection, continuous short-circuit protection, overtemperature protection, an
output-voltage trim function, a remote on/off control pin, and a sense pin. High efficiency
enables the HEN D12's to deliver rated output currents of
25 Amps at ambient temperatures to +65°C with 200 lfm air flow without heat sink.
If your new system boards call for multiple supply voltages, check out the
economics of on-board 12V distributed power. If you don't need to pay for multiple
isolation barriers, DATEL's non-isolated 1/4- and 1/8-bricks will save you money. Selected
models are RoHS-6 (Restriction of Hazardous Substances) compliant.
PRODUCT OVERVIEW
FEATURES
n
Eighth brick, through hole or SMT
with fast transient response
n
2-phase buck regulators for new
distributed 12V power architectures
n
12V input (10.2-13.8V range)
n
0.8/1/1.2/1.5/1.8/2/2.5/3.3/5VOUT @ 25A
n
Non-isolated, fixed-frequency,
synchronous-rectifier topology
n
Efficiencies to 87% @ 25 Amps
n
Noise as low as 10mVp-p
n
Stable no-load operation
n
On/Off control, trim & sense functions
n
Output Overvoltage Protection
n
Input Over/Undervoltage lockout
n
Thermal shutdown
n
Designed to meet UL/EN/IEC 60950-1 and CAN/
CSA C22.2 60950-1
n
EMC compliant
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_HEN-D12.B01 Page 1 of 11
HEN D12 Models
Single Output, Non Isolated, 12VIN, 0.8-5VOUT
25 Amp, High di/dt DC/DC Converters