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TPSC476M010R0350- Datasheet

In addition to the basic integrate and deintegrate dual- slope phases discussed above, the TC820 design incorpo- rates a "zero integrator output" phase and an "auto-zero" phase. These additional phases ensure that the integrator starts at OV (even after a severe overrange conversion ,and that all offset voltage errors (buffer amplifier, integrator and
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In addition to lower switching frequency, the LT1 374 also operates at lower switch current limit when the feedback pin voltage drops belowl.7V. Q2 in Figure 2 pe rforms this function by clamping the Vc pin to a voltage less than its normal 2.1V upper clamp level. This foldbackcurrentlirnit greatly reduces power dissipation in the lC, diode and inductorduring short-circuit conditions. External synchro- nization is also disabled to prevent interference with foldback operation. Again, it is nearly transparent to the user undernormalload conditions.The onlyloadsthat may be affected are current source loads which maintain full load currentwith outputvoltagelessthan 50% offinalvalue. In these rare situations the feedback pin can be clamped above l.5V with an external diode to defeat foldback cur- rent limit. Caution:clamping the feedback pin means that frequency shifting will also be defeated, so a combination of high input voltage and dead shorted output may cause the LT1374 to lose control of current limit.
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Parameter	Symbol	Test Conditions	Min	Typ	Max	U nits
Power Good Threshold	VPG	VDRAIN - VEE, High to Low transition	1.5	1.75	2.0	V
Power Good Threshold Hysteresis	VPGHY			0.4		V
Drain Input Bias Current	ID RAIN	VDRAIN 2 48V		1 5	50	pA
Output Low Voltage	VOL	SC4250H, VOL = PWRGD - VDRAIN @ VDRAIN = 5V, 10 = 1mA		1		V
Output Low Voltage	VOL	SC4250L, VOL = PWRGD - VEE @ VDRAIN = 1V, 10 = 1mA		1		V
Output Leakage	IOH	SC4250H, VDRAIN -VEE = 1V, VPWRGD = 80V		1.0	10	lJA
Output Leakage	IOH	SC4250L, VDRAIN -VEE = 5V		1.0	10	pA
AC Characteristics
OV High to Gate Low	tPHLOV			1.7		IJs
UV Low to Gate Low	tPHLUV			1.5		LJs
OV Low to Gate High	tPLHOV			5.5		LJs
UV Low to Gate High	tPLHUV			6.5		LJs
SENSE High to Gate Low	tPHLSENSE			3		IJs
DRAIN Low to PWRGD Low DRAIN Low to (PWRGD - DRAIN) High	tPHLPG			0.5		LJs
DRAIN High to PWRGD High DRAIN High to (PWRGD - DRAIN) Low	tPLHPG			O5		LJs
Gate ON Time - Time Delay	tON_1	VDRAIN > 8V, after short circuit		5		LJs
Gate ON Time - Time Delay	tON_2	VDRAIN < 7V, after short circuit		250		LJs

SYMBOL Rthjc	MIN	TYP	MAX 100	UNIT oC/W	Thermal Resistance -Infinite Heat Sink
Rthja			400	oC/W	Thermal Resistance - No Heat Sink
d P/d Tj		-0.6		%/oC	Temperature Coefficient - Optical Power
dA/d Tj		0.3		nm/oC	Temperature Coefficient -Whvelength
America: Tell-800-96MITEL Fax (613) 592-6909 Asia: Tel (65) 293 5312 Fax (65) 293 8527					MITEL Europe: Tel (46) 8 58 02 45 00 Fax (46) 8 58 02 01 10 Tel (44) 1291 436180 Fax (44) 1291 436771

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