PKB4213DPI datasheet(19/28 Pages) FLEX

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External decoupling capacitors will become part of the

product’s control loop. The control loop is optimized for a wide

range of external capacitance and the maximum and minimum

recommended value that could be used without any additional

analysis is found in the Electrical specification. The ESR of the

capacitors is a very important parameter. Stable operation is

guaranteed with a verified ESR value of >1

mΩ across the

output connections.

For further information please contact your local Ericsson

Power Modules representative.

Hybrid Regulated Ratio (HRR)

The product uses two regulation modes. The regulated ratio

mode let the regulator track the Vin with a fixed proportion, still

with a guard band for load and transient regulation. The hybrid

regulated mode swaps seamlessly from a ratio regulated

mode to a normally regulated mode above a certain input

voltage. See Output Characteristics in the Electrical

Specification.

HRR uses a fast adaption system and a slow adaption system

to react to both fast and slow input voltage changes to provide

an input voltage feed-forward function. The fast adaption

system prevents the converter to change output voltage very

rapid. It filters sudden input voltage changes. The slow

adaption system does not let fast input voltage transients

through in the regulated ratio mode, it just slowly adapts to the

new input voltage. When the input voltage changes the

tracking system needs up to 3 ms to fully respond.

In the normally regulated mode the tracking will be saturated

and the converter regulates towards a precision reference

voltage instead making it almost unsusceptible to transients.

Controlled low external output capacitor charge current at

input voltage step

Due to the slow adaption system the HRR product efficiently

reduces those charge currents for the external capacitors

during an input voltage transient or level shift.

HRR product output at input voltage step 36-75 V, 1 ms/div

Bottom trace – input voltage change 36-75 V, 20 V/div

Top trace – resulting output voltage change, 1 V/div

Input voltage transient suppression

The hybrid regulated product effectively suppresses input

voltage transients. This applies to both short duration

transients and step-like level shifts of the input voltage.

The amplitude of the output transients resulting of short

duration transient at the input voltage will be less than 1V.

In case of a step-like level shift of the input voltage, the output

voltage will rise to a new regulated ratio output voltage or to

12V depending of the final value of the input voltage step. The

hybrid regulated ratio prevents overshoots and undershoots in

association with this transition. These capabilities significantly

reduce the requirements on input transient response of Point

of Load regulators fed from this product.

Parallel Operation

This product is not designed for paralleling without using

external current sharing circuits. See Design Note 006 for

detailed information.

Over Temperature Protection (OTP)

The products are protected from thermal overload by an

internal over temperature shutdown circuit.

When TP1 as defined in thermal consideration section exceeds

130°C the product will shut down. The product will make

continuous attempts to start up (non-latching mode) and

resume normal operation automatically when the temperature

has dropped >10°C below the temperature threshold.

Over Voltage Protection (OVP)

The products have output over voltage protection that will shut

down the product in over voltage conditions. The product will

resume normal operation automatically after removal of the

over voltage condition. The OVP setpoint can be found in the

Electrical Specification.

Over Current Protection (OCP)

The products include current limiting circuitry for protection at

continuous overload. The OCP works in a hiccup mode and

will make continous attempts to start up and will resume

normal operation automatically after removal of the over

current condition. The load distribution should be designed for

the specified maximum output short circuit current.

Pre-bias Start-up

The product has a Pre-bias start up functionality and will not

sink current during start up if a pre-bias load is present at the

output terminals.

PKB4000D series Fully regulated DC-DC Converters

Input 36-75 V, Output up to 25 A / 300 W

28701-BMR674 01 Rev G

July 2019

Technical Speciﬁcation

PKB4213DPI Datasheet(PDF) 19 Page - Flex Power Modules. FLEX LTD.

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