Texas Instruments UCC2891 manual Input Ripple Voltage

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GAIN AND PHASE

			vs
			FREQUENCY
	60				180
			Phase
	40				120
	20				60
dB						- °
Gain -	0				0	Phase
			Gain
	-20				-60
		VIN = 48 V
	-40	IOUT = 10 A			-120
		gM = -10 dB
		ΦM = 50°
	-60				-180
	10	100	1 k	10 k	100 k
			f - Frequency - Hz

Figure 6.

GAIN AND PHASE

			vs
			FREQUENCY
	60				180
			Phase
	40				120
	20				60
dB						- °
Gain -	0		Gain		0	Phase
	-20				-60
		VIN = 72 V
	-40	IOUT = 10 A			-120
		gM = -9 dB
		Φ M = 50°
	-60				-180
	10	100	1 k	10 k	100 k
			f - Frequency - Hz

Figure 7.

Power Up/Down Test Procedures

Input Ripple Voltage

VIN = 36 V

IOUT = 30 A

500 mV/div

1 V peak-to-peak

t − T ime − 2.5 μs/div

Figure 8.

Output Ripple Voltage

VIN = 72 V

IOUT = 30 A

50 mV/div

36 mV peak-to-peak

t − T ime − 2.5 μs/div

Figure 9.

SLUU178A –November 2003 –Revised December 2006 Using the UCC2891 Active Clamp Current Mode PWM Controller 11

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