ELECTRICAL CHARACTERISTICS CURVES
CH1
CH4
CH2
CH2
CH3
CH3
CH1
Figure 5: Hold up performance (5mS/div):
CH1: Vin (VRTN_AF reference to -48V_AF, 10V/div).
CH2: Iin (2A/div).
CH3: 12V Vout (5V/div).
CH4: VRTN_OUT reference to –48V_OUT (10V/div).
Test conditions:
(1) Feed A=48Vdc; Feed B=0Vdc
(2) Q48SH12025: I(12V Out)=22.5A, I(3.3V)=2.5A,
I(5V BLUE_LED PWR)=0A.
(3) C2=220uF, C_hold=470uF X4
100
99
98
97
96
95
94
93
92
91
90
10
20
30
40
50
60
70
80
90
100
OUTPUT CURRENT(A%)
75Vin
48Vin
38Vin
1
Figure 6: -48V_ALARM with loss of Feed (20mS/div):
CH1: VinA (VRTN_AF reference to -48V_AF, 20V/div).
CH2: VinB (VRTN_BF reference to -48V_BF, 20V/div).
CH3: -48V_ALARM (2V/div)
Test conditions:
(1) Feed A turn off from 48Vdc; Feed B=48Vdc.
(2) Q48SH12025: I(12V Out)=22.5A, I(3.3V)=2.5A,
I(5V BLUE_LED PWR)=0A.
(3) C2=220uF, C_hold=220uF
CH3
CH2
EFFICIENCY (%)
CH1
Figure 7: Efficiency vs. load current for minimum, nominal,
and maximum input voltage at 25°C:
Test conditions:.
(1) I(MGMT_PWR)=0A; I(5V BLUE_LED PWR)=0A;
(2) C2=220uF, C_hold=220uF
Figure 8: MGMT_PWR (3.3V) and BLUE_LED_PWR (5V)
start up waveform (10mS/div):
CH1: VinA (VRTN_AF referenced to -48V_AF, 50V/div).
CH2: V(MGMT_PWR) (1V/div);
CH3: V(5V BLUE_LED_PWR) (1V/div)
Test conditions:
(1) Feed A=48Vdc; Feed B=0Vdc
(2) I(VRTN_OUT)=1A,I(3.3V)=2.5A,
I(5V BLUE_LED PWR)=0.1A
(3) C2=220uF, C_hold=220uF
PRELIMINARY DATASHEET
DS_DIM3R3_08292008
6
DELTA [ DELTA ELECTRONICS, INC. ]
