UG-179 Datasheet, PDF (6/12 Pages) Analog Devices – Automatic PFM/PWM mode switching

UG-179
V_OUT
IL
1
4
EN
SW
3
2
CH1 1V ^BW
CH3 10V ^BW
CH2 10V
BW _M100µs
CH4 500mA Ω ^BW
A CH3 8V
Figure 8. Soft Start with 1 A Resistance Load, fSW = 1.4 MHz
V_OUT
1
I_OUT
4
SW
2
CH1 50mV ^BW CH2 10V
BW _{M100µs A CH4 630mA}
CH4 500mA Ω ^BW
Figure 9. ADP2301 Load Transient, 0.2 A to 1.0 A, VOUT = 3.3 V, VIN = 12 V
(fSW = 1.4 MHz, L = 4.7 μH, COUT = 22 μF)
V_OUT
1
I_OUT
4
SW
2
CH1 100mV ^BW CH2 10V
BW _{M100µs A CH4 630mA}
CH4 500mA Ω ^BW
Figure 10. ADP2300 Load Transient, 0.2 A to 1.0 A, VOUT = 3.3 V, VIN = 12 V
(fSW = 700 kHz, L = 10 μH, COUT = 22 μF)
Evaluation Board User Guide
V_OUT
1
V_IN
SW
3
2
CH1 5mV ^BW CH2 10V
CH3 5V
BW _M1ms
A CH3 11.4V
Figure 11. ADP2301 Line Transient,
7 V to 15 V, VOUT = 3.3 V, IOUT = 1.2 A, fSW = 1.4 MHz
100
200
80
160
60
120
40
80
20
40
0
0
–20
–40
–40
–80
–60
–120
–80 _{CROSS FREQUENCY: 80kHz}
PHASE MARGIN: 68°
–100
1k
10k
100k
FREQUENCY (Hz)
–160
–200
1M
Figure 12. ADP2301 Bode Plot, VOUT = 3.3 V, VIN = 12 V
(fSW = 1.4 MHz, L = 4.7 μH, COUT = 22 μF)
100
200
80
160
60
120
40
80
20
40
0
0
–20
–40
–40
–80
–60
–120
–80 _{CROSS FREQUENCY: 47kHz}
PHASE MARGIN: 77°
–100
1
1k
10k
100k
FREQUENCY (Hz)
–160
–200
1M
Figure 13. ADP2300 Bode Plot, VOUT = 3.3 V, VIN = 12 V
(fSW = 700 kHz, L = 10 μH, COUT = 22 μF)
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