cui.com

date

12/23/2015

│ page 5 of 33

CUI Inc

│ MODEL: NDM3Z-90 │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER

PRODUCT ELECTRICAL SPECIFICATION (CONTINUED)

parameter

conditions/description

min

typ

max

units

short circuit current (I

RMS, hiccup mode, V

12

A

efficiency (η)

50% of max I

O

V

V

V

87.6

91.4

94.3

%

%

%

I

V

V

V

83.7

88.7

92.5

%

%

%

power dissipation at max I

V

V

V

10.5

11.5

13.1

W

W

W

input idling power (P

V

V

V

1.29

1.35

1.82

W

W

W

input standby power (P

turned off with CTRL-pin

0.44

W

switching frequency

(f

320

kHz

(f

PMBus configurable

FREQUENCY_SWITCH

200

640

kHz

switching frequency set-point

accuracy (f

-5

5

%

external sync pulse width

(f

150

ns

input clock frequency drift tol-

erance (f

external sync

-10

10

%

initialization time (T

From VI > ~2.7 V to ready to be enabled

67

ms

output voltage

total on delay time (T

enabled by input voltage

enabled by CTRL pin

T

T

ONdel

output voltage on delay time

(T

turn on delay duration

range PMBus configurable TON_DELAY

accuracy (actual delay vs set value)

3

5

-0/+2

250

ms

ms

ms

(T

turn off delay duration

range PMBus configurable TOFF_DELAY

accuracy (actual delay vs set value)

4

0

-0/+2

250

ms

ms

ms

output voltage on/off ramp up

time (0→100%,100→0% of V

(T

turn on ramp duration

5

ms

turn off ramp duration

Disabled in standard configuration.

Turn off immediately upon expiration

of turn off delay.

ramp duration range PMBus configurable

TON_RISE/TOFF_FALL

0

100

ms

ramp time accuracy for standalone operation (ac-

tual ramp time vs set value)

250

μs

power good threshold (PG)

rising

falling

90

85

%V

O

%V

O

power good threshold range

(PG)

PMBus configurable

POWER_GOOD_ON

VOUT_UV_FAULT_LIMIT

0

100

%V

O

Notes:

1. Value refers to total (internal + external) effective output capacitance. Capacitance derating with VO typical for ceramic capacitors (bias characteristics) and

temperature variations must be considered for the external capacitor(s). See section External Output Capacitors.

2. There are configuration changes to consider when changing the switching frequency, see section Switching Frequency.

3. The specified accuracy applies for off delay times larger than 4 ms. A value of 0 ms can be set to guarantee a fast shut-off, but this will force the device to

Immediate Off behavior, even if soft-off, i.e. ramp-down, is configured. When setting 0 ms the actual delay will be 0 ms.

For more information, please visit the product page.