ST TSC102 User Manual

TSC102

High-side current sense amplifier plus signal conditioning amplifier

Features

■Independent supply and input common-mode voltages

■Wide common-mode operating range: 2.8 to 30 V

■Wide common-mode surviving range:

-16 to 60 V (reversed battery and load-dump conditions)

■Low current consumption: ICC max = 420 µA

■Output amplifier for tailor-made signal conditioning

■-40 to 125° C operating temperature range

■4 kV ESD protection

Applications

■Battery chargers

■Automotive current monitoring

■Notebook computers

■DC motor control

■Photovoltaic systems

■Precision current sources

■Uninterruptible power supplies

■High-end power supplies

Description

P

TSSOP8

(Plastic package)

D

SO-8

(Plastic package)

Vm 1		8	Vp
Gnd	2	7	A3
A1	3	6	Vcc
A2	4	5	Out

Pin connections (top view)

The TSC102 measures a small differential voltage on a high-side shunt resistor and translates it into a ground-referenced output voltage.

The device’s wide input common-mode voltage range, low quiescent current and tiny TSSOP8 packaging enable use in a wide variety of applications (also available in SO-8 package).

The input common-mode and power supply voltages are independent. The common-mode voltage can range from 2.8 to 30 V in operating conditions.

The TSC102 is rugged against abnormal conditions on the input pins: Vp and Vm can withstand up to 60 V in case of voltage spikes, as little as -16 V in case of reversed battery, and up to 4 kV in case of electrostatic discharge.

In addition to the current sensing amplifier, the TSC102 offers a fully accessible amplifier for output signal conditioning.

The device’s overall current consumption is lower than 420 µA.

March 2011

Doc ID 16754 Rev 2

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Contents	TSC102

Contents

1	Application schematic and pin description . . . . . . . . . . . . . . . . .		. . . . . 3
2	Absolute maximum ratings and operating conditions . . . . . . . .		. . . . . 4
3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . . 5
4	Electrical characteristics curves: current sense amplifier . . . . .		. . . . . 8
5	Electrical characteristics curves: signal conditioning amplifier		. . . . 11
6	Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . 12
	6.1	Common-mode rejection ratio (CMR) . . . . . . . . . . . . . . . . . . . . . . .	. . . . 12
	6.2	Supply voltage rejection ratio (SVR) . . . . . . . . . . . . . . . . . . . . . . . .	. . . . 12
	6.3	Gain (Av) and input offset voltage (Vos) . . . . . . . . . . . . . . . . . . . . . .	. . . . 12
	6.4	Output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . .	. . . . 13
	6.5	Output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . 14
7	Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . 16
8	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. . . . 19

8.1 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.2 TSSOP-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

9	Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	22
10	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	23

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TSC102	Application schematic and pin description

1 Application schematic and pin description

The TSC102 high-side current sense amplifier features a 2.8 to 30 V input common-mode range that is independent of the supply voltage. The main advantage of this feature is that it allows high-side current sensing at voltages much greater than the supply voltage (VCC).

Figure 1. Application schematics

Current

Signal

sense

conditioning

amplifier

amplifier

5 V

6

Iload

Vp

TSC102

Vcc

8

Out

Rsense

Av=20 V/V

5

Vm

1

Vsense

Gnd

A1

A2

A3

2

3

4

7

Vout

AM04508

Table 1 describes the function of each pin. Their position is shown in the illustration on the cover page and in Figure 1 above.

	A1	Pin description
	Table 1.
	Symbol	Type	Function
	Out	Analog output	Out voltage is proportional to the magnitude of the sense voltage
			Vp-Vm.
	Gnd	Power supply	Ground line.
	VCC	Power supply	Positive power supply line.
	Vp	Analog input	Connection for the external sense resistor. The measured current
			enters the shunt on the Vp side.
	Vm	Analog input	Connection for the external sense resistor. The measured current
			exits the shunt on the Vm side.
	A1	Analog input	Connection to current sensing amplifier output.
	A2	Analog input	Connection to signal conditioning amplifier non-inverting input.
	A3	Analog input	Connection to signal conditioning amplifier inverting input.

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Absolute maximum ratings and operating conditions	TSC102

2 Absolute maximum ratings and operating conditions

	Table 2.	Absolute maximum ratings
	Symbol	Parameter				Value	Unit
	Vid	Input pins differential voltage (Vp-Vm)				±20	V
	Vi	Current sensing input pin voltages (Vp and Vm)(1)				-16 to 60	V
	V1	Voltage for pins A1, A2, A3, Out, Vcc(1)				-0.3 to 7	V
	Tstg	Storage temperature				-55 to 150	°C
	Tj	Maximum junction temperature				150	°C
	Rthja	TSSOP8 thermal resistance junction to ambient				120	°C/W
		SO-8 thermal resistance junction to ambient				125	°C/W
		HBM: human body model for V	m	and V	pins(2)	4	kV
					p
	ESD	HBM: human body model(3)				2.5	kV
		MM: machine model(4)				200	V
		CDM: charged device model(5)				1.5	kV

1.These voltage values are measured with respect to the GND pin.

2.Human body model for Vm and Vp: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between the Vp or Vm pin and Gnd while the other pins are floating.

3.Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.

4.Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of connected pin combinations while the other pins are floating.

5.Charged device model: all pins plus package are charged together to the specified voltage and then discharged directly to ground.

Table 3.	Operating conditions
Symbol	Parameter	Value	Unit
VCC	DC supply voltage from Tmin to Tmax	3.5 to 5.5	V
Toper	Operational temperature range (Tmin to Tmax)	-40 to 125	°C
Vicm	Common mode voltage range (Vm pin voltage)	2.8 to 30	V

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TSC102	Electrical characteristics

3 Electrical characteristics

Unless otherwise specified, the electrical characteristics given in the following tables have been measured under the following test conditions.

●Tamb = 25° C, VCC = 5 V, Vsense = Vp-Vm = 50 mV, Vm = 12 V.

●No load on Out pin.

●Signal conditioning amplifier used as a buffer (pin A3 connected to pin Out and pin A1 connected to pin A2).

Table 4.	Supply
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
ICC		Vsense = 0 V, pin A1 open, pin
	Total supply current	A2 shorted to Gnd		240	420	µA
		Tmin < Tamb < Tmax
ICC1	Total supply current	Vsense = 50 mV, pin A1		420	700	µA
		connected to pin A2
		Tmin < Tamb < Tmax

Table 5.	Current sensing amplifier input stage
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
DC	DC common mode rejection	2.8 V < Vm < 30 V
	Variation of Va1 versus Vicm		90	100		dB
CMR1		-40° C < Tamb < 150° C
	referred to input(1)
	AC common mode rejection	2.8 V< Vm < 30 V		75		dB
	Variation of Va1 versus Vicm	1 kHz sine wave
AC CMR1
	referred to input (peak-to-peak	2.8 V < Vm < 30 V		60		dB
	voltage variation)
		10 kHz sine wave
SVR1	Supply voltage rejection	3.5 V< VCC < 5.5 V	85	90		dB
	(2)
		-40° C < Tamb < 125° C
	Variation of Va1 versus VCC
V	(3)	Tamb = 25° C			±1.5	mV
	Input offset voltage
os		-40° C < Tamb < 125° C			±2.3
dVos/dT	Input offset drift versus T	-40° C < Tamb < 125° C		±3	±8	µV/°C
Ilk	Input leakage current	VCC = 0 V			1	µA
		Tmin < Tamb < Tmax
Iib	Input bias current	Vsense = 0 V		5	7	µA
		Tmin < Tamb < Tmax

1.See Chapter 6: Parameter definitions on page 12 for the definition of CMR.

2.See Chapter 6 for the definition of SVR.

3.See Chapter 6 for the definition of Vos.

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Electrical characteristics								TSC102
Table 6.		Current sensing amplifier output stage
Symbol		Parameter		Test conditions	Min.	Typ.	Max.	Unit
Av		Gain				20		V/V
		(variation of Va1 versus Vsense)
		A1 node high-level saturation	Vsense = 1 V
V		voltage	Ia1 = 1 mA			85	185	mV
oh1		Voh1 = Vcc-Va1	-40° C< T < 125° C
				amb
		A1 node low-level saturation	Vsense =-1 V
Vol1		voltage	Ia1 = 1 mA			75	165	mV
			-40° C< Tamb < 125° C
Isc1		Short-circuit current	A1 connected to VCC or Gnd		10	30		mA
Va1/	T	Output voltage drift versus T(1)	Tmin < Tamb < Tmax				±400	ppm/°C
Va1/	Ia1	Output stage load regulation	-5 mA < Ia1< +5 mA			0.4	±2	mV/mA
			Ia1 sink or source current
		Total output voltage accuracy(2)	Vsense = 50 mV
V			T	= 25° C			±2.5	%
a1			amb
			Tmin < Tamb < Tmax				±4
		Total output voltage accuracy(2)	Vsense = 100 mV
V			T	= 25° C			±2.5	%
a1			amb
			Tmin < Tamb < Tmax				±4
		Total output voltage accuracy(2)	Vsense = 20 mV
V			T	= 25° C			±8	%
a1			amb
			Tmin < Tamb < Tmax				±10
		Total output voltage accuracy(2)	Vsense = 10 mV
V			T	= 25° C			±13	%
a1			amb
			Tmin < Tamb < Tmax				±16

1.See Chapter 6: Parameter definitions on page 12 for the definition of output voltage drift versus temperature.

2.Output voltage accuracy is the difference with the expected theoretical output voltage Va1-th = Av * Vsense. See Chapter 6 for a more detailed definition.

Table 7.	Current sensing amplifier frequency response
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
ts	Va1 settling to 1% final value	Vsense = 10 mV to 100 mV,		7		µs
		Cload = 47 pF
SR	Slew rate	Vsense = 10 mV to 100 mV	0.2	0.4		V/µs
BW	3 dB bandwidth	Cload = 47 pF		800		kHz

Table 8.	Current sensing amplifier noise
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
eN	Equivalent input noise voltage	f = 1 kHz		50		nV/√
							Hz

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TSC102					Electrical characteristics
Table 9.	Signal conditioning amplifier
Symbol	Parameter			Test conditions	Min.	Typ.	Max.	Unit
Vicm	Common mode voltage range		Tmin < Tamb < Tmax		0		Vcc
			Va2 = 1 V
VIO	Input offset voltage		Tamb = 25° C				±3.5	mV
			-40° C < Tamb < 150° C				±4.5
VIO	Input offset voltage drift		Tmin < Tamb < Tmax			5		µV/°C
Iib	Input bias current		Va2 = Va3 = VCC/2			10		pA
Voh2	Output high-level saturation		Va2 = 1 V Va3 = 0 V Iout = 1 mA			85	185	mV
	voltage (Voh2 = VCC-Vout)		-40° C< Tamb < 125° C
			Va2 = 0 V Va3 = 1 V
Vol2	Output low-level saturation voltage		Iout = 1 mA			75	165	mV
			-40° C< Tamb < 125° C
Isc2	Short-circuit current		Out connected to VCC or Gnd		12	30		mA
Vout/ Iout	Output stage load regulation		-10 mA < Iout < +10 mA				300	µV/mA
			V	= 1 V
			a2
			Iout sink or source current
CMR2	DC common mode rejection		Tmin < Tamb < Tmax		70	95
	Variation of VIO versus Vicm		0 V<Va2<3 V					dB
			0 V<Va2<5 V		60	80
SVR2	Supply voltage rejection		3.5 V<VCC<5.5 V		85	105		dB
			Va2 = 1 V
	Variation of VIO versus VCC
			-40° C < Tamb < 125° C
GBP	Gain bandwidth product		RL = 10 kΩ, Cload = 100 pF,			1		MHz
			f = 100 kHz
PM	Phase margin		RL = 10 kΩ, Cload = 100 pF			65		deg
			RL = 10 kΩ, Cload = 100 pF
			Va2 = 0.5 V to 4.5 V
SR	Slew rate		A3 connected to OUT (follower		0.2	0.4		V/µs
			configuration)
			Slew rate measured from 10%
			to 90% of Vout step

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Electrical characteristics curves: current sense amplifier	TSC102

4Electrical characteristics curves: current sense amplifier

Unless otherwise specified, the test conditions for the following curves are:

●Tamb = 25° C, VCC = 5 V, Vsense =Vp-Vm = 50 mV, Vm = 12 V.

●no load on Out pin.

●signal conditioning amplifier used as a buffer (pin A3 connected to pin Out and pin A1 connected to pin A2).

Figure 2. Output voltage vs. Vsense					Figure 3. A1 pin voltage accuracy vs. Vsense
		6			20%
		5			15%	typical accuracy			guaranteed
									accuracy vs. T
					10%
		4			5%
(V)
		3			0%
Vout
		2			-5%
					-10%				guaranteed
		1			-15%				accuracy @25°C
		0			-20%
	-50	50	150	250	0		50	100	150	200
		Vsense (mV)					Vsense (mV)
Figure 4. Supply current vs. supply voltage					Figure 5. Supply current vs. Vsense
	500						700
	450						600	T=-40°C
	400						500
	350
		T=125°C
Icc (µA)	300				Icc (µA)		400
									T=25°C
	250						300
	200								T=125°C
	150		T=-40°C				200
	100		T=25°C				100
	50
	0						0
	0	2	4	6	-250	-150	-50	50	150	250
			Vcc (V)				Vsense (mV)

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